173-483: The North American F-100 Super Sabre is an American supersonic jet fighter aircraft designed and produced by the aircraft manufacturer North American Aviation . The first of the Century Series of American jet fighters, it was the first United States Air Force (USAF) fighter capable of supersonic speed in level flight . The F-100 was envisioned during the late 1940s as a higher-performance successor to
346-399: A convergent-divergent nozzle is needed on high-speed aircraft. The engine thrust is highest if the static pressure of the gas reaches the ambient value as it leaves the nozzle. This only happens if the nozzle exit area is the correct value for the nozzle pressure ratio (npr). Since the npr changes with engine thrust setting and flight speed this is seldom the case. Also at supersonic speeds
519-494: A zero-length launch . This was accomplished by adding a large canister to the underside of the aircraft, which contained a black powder compound and was ignited electromechanically, driving the jet engine to minimal ignition point . This capability was incorporated into late-production aircraft. The F-100F two-seat trainer was accepted into USAF service in January 1958. It received many of the same weapons and airframe upgrades as
692-537: A UN counter-offensive two months later. After an abortive Chinese spring offensive , UN forces retook territory roughly up to the 38th parallel. Armistice negotiations began in July 1951, but dragged on as the fighting became a war of attrition and the north suffered heavy damage from U.S. bombing . Combat ended on 27 July 1953 with the signing of the Korean Armistice Agreement , which allowed
865-408: A compressor ( axial , centrifugal , or both), mixing fuel with the compressed air, burning the mixture in the combustor , and then passing the hot, high pressure air through a turbine and a nozzle . The compressor is powered by the turbine, which extracts energy from the expanding gas passing through it. The engine converts internal energy in the fuel to increased momentum of the gas flowing through
1038-412: A contract to modify six F-100As to RF-100As carrying five cameras, three Fairchild K-17 cameras (see Fairchild K-20 camera) in a trimetrogon mounting for photo mapping and two Fairchild K-38 cameras in a split vertical mounting with the cameras mounted horizontally, shooting via a mirror angled at 45° to reduce the effects of airframe vibrations. All gun armament was removed, and the cameras installed in
1211-509: A general attack across the 38th parallel, rather than a limited operation in Ongjin. Kim was concerned that South Korean agents had learned about the plans and that South Korean forces were strengthening their defenses. Stalin agreed to this change. While these preparations were underway in the North, there were clashes along the 38th parallel, especially at Kaesong and Ongjin, many initiated by
1384-427: A higher priority than fuel efficiency, fans tend to be smaller or absent. Because of these distinctions, turbofan engine designs are often categorized as low-bypass or high-bypass , depending upon the amount of air which bypasses the core of the engine. Low-bypass turbofans have a bypass ratio of around 2:1 or less. The term Advanced technology engine refers to the modern generation of jet engines. The principle
1557-406: A jet of water. The mechanical arrangement may be a ducted propeller with nozzle, or a centrifugal compressor and nozzle. The pump-jet must be driven by a separate engine such as a Diesel or gas turbine . All jet engines are reaction engines that generate thrust by emitting a jet of fluid rearwards at relatively high speed. The forces on the inside of the engine needed to create this jet give
1730-401: A jet. During one of its early test flights, the first prototype reached a maximum of Mach 1.05 in spite of being fitted with a derated Pratt & Whitney XJ57-P-7 engine. By September, flight testing had confirmed the presence of three major deficiencies in the design, all of which required correction ahead of it being considered as acceptable. On 14 October 1953, the second prototype flew for
1903-426: A large number of different types of jet engines, all of which achieve forward thrust from the principle of jet propulsion . Commonly aircraft are propelled by airbreathing jet engines. Most airbreathing jet engines that are in use are turbofan jet engines, which give good efficiency at speeds just below the speed of sound. A turbojet engine is a gas turbine engine that works by compressing air with an inlet and
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#17327759769022076-526: A mockup of the envisioned F-110B1 was completed, it was intended as a backup for the in-development Convair F-102 Delta Dagger interceptor. However, the difficulties experienced with the F-100A were viewed as evidence that the aircraft, even in the face of expected improvements, would be incapable of satisfying the operational requirement to a greater degree than that of the F-102. The definitive model would be
2249-596: A national political constitution on 17 July and elected Syngman Rhee as president on 20 July. The Republic of Korea (South Korea) was established on 15 August 1948. In the Soviet-Korean Zone of Occupation, the Soviets agreed to the establishment of a communist government led by Kim Il Sung. The 1948 North Korean parliamentary elections took place in August. The Soviet Union withdrew its forces in 1948 and
2422-530: A pair of Turkish Air Force F-100s entered into the Soviet Union airspace. While three Su-15s were intercepting the intruders, a ground based Soviet SAM battery shot down one of the Turkish F-100s. In March 1987, Turkish Super Sabres bombed PKK bases in northern Iraq. On 14 September 1983, a pair of Turkish Air Force F-100F Super Sabres of 182 Filo “Atmaca” penetrated Iraqi airspace. A Mirage F1EQ of
2595-663: A parliamentary question by Republican People's Party (CHP) MP Metin Lütfi Baydar in the aftermath of the downing of a Turkish F-4 Phantom II in Syria, in 2012. Taiwan took delivery of 119 F-100As, 4 RF-100As, and 14 F-100Fs, and lost a number of F-100As and Fs in the course of service, but never lost a single RF-100A in either combat or accident. Those four RF-100As had never been sent on a reconnaissance mission over mainland China, as they could only produce photographic images of mediocre quality at best. Moreover, after each flying hour,
2768-435: A particular engine design that if some bumps in a bypass duct are smoothed out the air will flow more smoothly giving a pressure loss reduction of x% and y% less fuel will be needed to get the take-off thrust, for example. This understanding comes under the engineering discipline Jet engine performance . How efficiency is affected by forward speed and by supplying energy to aircraft systems is mentioned later. The efficiency of
2941-759: A powerplant for the world's first jet- fighter aircraft , the Messerschmitt Me 262 (and later the world's first jet- bomber aircraft, the Arado Ar 234 ). A variety of reasons conspired to delay the engine's availability, causing the fighter to arrive too late to improve Germany's position in World War II , however this was the first jet engine to be used in service. Meanwhile, in Britain the Gloster E28/39 had its maiden flight on 15 May 1941 and
3114-577: A spin. The model was phased out of USAF service in 1972. On July 15, 1958, the 354th Tactical Fighter Wing deployed 29 F-100Ds and Fs to Incirlik Air Base during the 1958 Lebanon crisis to support the Marine landing in Beirut to form a composite air strike force with B-57s , RB-66s , C-124s , RF-101s , and C-130s . In August, 1958, the USAF sent F-100Ds, F-101Cs, F-104As , and B-57Bs to Taiwan during
3287-530: A strong thrust on the engine which pushes the craft forwards. Jet engines make their jet from propellant stored in tanks that are attached to the engine (as in a 'rocket') as well as in duct engines (those commonly used on aircraft) by ingesting an external fluid (very typically air) and expelling it at higher speed. A propelling nozzle produces a high velocity exhaust jet . Propelling nozzles turn internal and pressure energy into high velocity kinetic energy. The total pressure and temperature don't change through
3460-439: A substantial initial forward airspeed before it can function. Ramjets are considered the simplest type of air breathing jet engine because they have no moving parts in the engine proper, only in the accessories. Scramjets differ mainly in the fact that the air does not slow to subsonic speeds. Rather, they use supersonic combustion. They are efficient at even higher speed. Very few have been built or flown. The rocket engine uses
3633-402: A sudden yaw and roll , occurring too rapidly for the pilot to correct and would quickly overstress the aircraft's structure, leading to disintegration. It was under these conditions that North American's chief test pilot, George Welch , was killed while dive testing an early-production F-100A (s/n 52-5764) on 12 October 1954. Several early modifications were made to address the problem, including
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#17327759769023806-421: A supersonic afterburning engine or 2200 K with afterburner lit. The pressure entering the nozzle may vary from 1.5 times the pressure outside the nozzle, for a single stage fan, to 30 times for the fastest manned aircraft at Mach 3+. Convergent nozzles are only able to accelerate the gas up to local sonic (Mach 1) conditions. To reach high flight speeds, even greater exhaust velocities are required, and so
3979-553: A supersonic trainer. During December 1955, an initial production contract for the F-100F trainer was placed. The prototype TF-100C , which lacked most operational equipment, made its first flight on 6 August 1956; it was followed by the first production aircraft on 7 March 1957. The North American F-100 Super Sabre is a supersonic fighter aircraft. It was one of the first aircraft with a stabilator , or all-moving tailplane. Unlike modern stabilators which use an anti-servo tab, gearing and
4152-615: A telegram. Mao accepted the decision made by Kim and Stalin to unify Korea but cautioned Kim over possible US intervention. Soviet generals with extensive combat experience from World War II were sent to North Korea as the Soviet Advisory Group. They completed plans for attack by May and called for a skirmish to be initiated in the Ongjin Peninsula on the west coast of Korea. The North Koreans would then launch an attack to capture Seoul and encircle and destroy
4325-402: A test stand, sucks in fuel and generates thrust. How well it does this is judged by how much fuel it uses and what force is required to restrain it. This is a measure of its efficiency. If something deteriorates inside the engine (known as performance deterioration ) it will be less efficient and this will show when the fuel produces less thrust. If a change is made to an internal part which allows
4498-461: A two-stage axial compressor feeding a single-sided centrifugal compressor . Practical axial compressors were made possible by ideas from A.A.Griffith in a seminal paper in 1926 ("An Aerodynamic Theory of Turbine Design"). Whittle would later concentrate on the simpler centrifugal compressor only. Whittle was unable to interest the government in his invention, and development continued at a slow pace. In Spain, pilot and engineer Virgilio Leret Ruiz
4671-475: A variable stiffness spring were attached to the control stick to provide acceptable resistance to prevent pilot-induced oscillation. Unusually, the aircraft made extensive use of titanium throughout key areas of the airframe. The F-100 exhibited several concerning handling difficulties, especially early on in its flying career. Particularly troubling was the yaw instability in certain flight conditions, which produced inertia coupling . The aircraft could develop
4844-410: A violent pitch-up . This particular phenomenon (which could easily be fatal at low altitude with insufficient time to recover) became known as the " Sabre dance ". The F-100 was the subject of many modification programs over the course of its service. Many of these were improvements to electronics, structural strengthening, and projects to improve ease of maintenance. One of these was the replacement of
5017-507: Is documented in the story of Ottoman soldier Lagâri Hasan Çelebi , who reportedly achieved flight using a cone-shaped rocket in 1633. The earliest attempts at airbreathing jet engines were hybrid designs in which an external power source first compressed air, which was then mixed with fuel and burned for jet thrust. The Italian Caproni Campini N.1 , and the Japanese Tsu-11 engine intended to power Ohka kamikaze planes towards
5190-542: Is known as the Brayton thermodynamic cycle . Jet aircraft use such engines for long-distance travel. Early jet aircraft used turbojet engines that were relatively inefficient for subsonic flight. Most modern subsonic jet aircraft use more complex high-bypass turbofan engines . They give higher speed and greater fuel efficiency than piston and propeller aeroengines over long distances. A few air-breathing engines made for high-speed applications (ramjets and scramjets ) use
5363-460: Is overrun by unprovoked armed attack would start a disastrous chain of events leading most probably to world war." While there was hesitance by some in the US government to get involved, considerations about Japan fed into the decision to engage on behalf of South Korea. After the fall of China to the communists, US experts saw Japan as the region's counterweight to the Soviet Union and China. While there
North American F-100 Super Sabre - Misplaced Pages Continue
5536-443: Is that a turbine engine will function more efficiently if the various sets of turbines can revolve at their individual optimum speeds, instead of at the same speed. The true advanced technology engine has a triple spool, meaning that instead of having a single drive shaft, there are three, in order that the three sets of blades may revolve at different speeds. An interim state is a twin-spool engine, allowing only two different speeds for
5709-400: Is the propellant flow in kg/s, A e {\displaystyle A_{e}} is the cross-sectional area at the exit of the exhaust nozzle, and p {\displaystyle p} is the atmospheric pressure. Combined-cycle engines simultaneously use two or more different principles of jet propulsion. A water jet, or pump-jet, is a marine propulsion system that uses
5882-570: Is used for launching satellites, space exploration and crewed access, and permitted landing on the Moon in 1969. Rocket engines are used for high altitude flights, or anywhere where very high accelerations are needed since rocket engines themselves have a very high thrust-to-weight ratio . However, the high exhaust speed and the heavier, oxidizer-rich propellant results in far more propellant use than turbofans. Even so, at extremely high speeds they become energy-efficient. An approximate equation for
6055-752: The 388th Tactical Fighter Wing in December. They were joined by three more aircraft in February 1966. All Wild Weasel F-100Fs were eventually modified to fire the AGM-45 Shrike anti-radiation missile. French Air Force Super Sabres of the EC 1/3 Navarre flew combat missions, striking from bases within France against targets in French Algeria . The planes were based at Reims , refueling at Istres on
6228-470: The 450th Fighter Wing at Foster AFB , Texas. Operational testing in 1955 revealed that the F-100C was at best an interim solution, sharing all the flaws of the F-100A. The uprated J57-P-21 engine boosted performance, although it continued to suffer from compressor stalls , but the F-100C was considered an excellent platform for nuclear toss bombing because of its high top speed. The inertia coupling problem
6401-621: The Berlin Wall 's construction in August 1961, the USAF was compelled to recall the F-100As into active service. During early 1962, it was decided to extend the type's service life. However, the F-100A was largely used for aircrew training during this time. Due to attrition, the ANG ceased operating the F-100A during 1967 while the USAF opted to permanently retire the model in early 1970. The F-100C fighter-bomber entered service on 14 July 1955 with
6574-532: The F-107 , did not proceed through to production. Amid a relatively high attrition rate and the arrival of more advanced fighters, the USAF opted to permanently withdraw its remaining F-100s during the early 1970s. The type was also operated by the Air National Guard (ANG) until 1979. The F‑100 was exported to several overseas operators, including NATO air forces and other U.S. allies, including
6747-719: The F-86 Sabre air superiority fighter. Initially referred to as the Sabre 45 , it was delivered as an unsolicited proposal to the USAF in January 1951, leading to two prototypes being ordered one year later following modifications. The first YF-100A performed its maiden flight on 25 May 1953, seven months ahead of schedule. Flight testing demonstrated both the F-100's promising performance and several deficiencies, which included its tendency of yaw instability and inertia coupling that led to numerous fatal accidents. On 27 September 1954,
6920-852: The Gloster Meteor finally entered service with the RAF in July 1944. These were powered by turbojet engines from Power Jets Ltd., set up by Frank Whittle. The first two operational turbojet aircraft, the Messerschmitt Me 262 and then the Gloster Meteor entered service within three months of each other in 1944; the Me 262 in April and the Gloster Meteor in July. The Meteor only saw around 15 aircraft enter World War II action, while up to 1400 Me 262 were produced, with 300 entering combat, delivering
7093-523: The Lockheed U-2 took over as the deep-penetration aerial reconnaissance asset. Three RF-100As were also deployed to the 6021st Reconnaissance Squadron at Yokota Air Base in Japan, but details of operations there are not available. Two RF-100As were lost in accidents, one due to probable overspeeding, which caused the separation of one of the drop tanks and resulted in complete loss of control, and
North American F-100 Super Sabre - Misplaced Pages Continue
7266-685: The Second Taiwan Strait Crisis to demonstrate support for Taiwan. By 1961, England AFB , Louisiana, ( 401st Tactical Wing ) had four fighter-bomber squadrons, the 612th, 613th, 614th, and the 615th (Fighting Tigers). During the Berlin crisis (approximately September 1961), the 614th was deployed to Ramstein Air Base , Germany, to support the West Germans. At the initial briefing, the 614th personnel were informed that due to
7439-716: The Turkish Air Force , Republic of China Air Force , and the French Air Force . The F-100 was deployed during the Turkish invasion of Cyprus , performing close air support missions. French F-100s also saw action during the Algerian War . During its later life, the F-100 was often referred to as the "Hun", a shortened version of "one hundred". The F-100 can be traced back to an internal design study performed by North American Aviation as early as 1949. It
7612-500: The aeolipile , a device described by Hero of Alexandria in 1st-century Egypt . This device directed steam power through two nozzles to cause a sphere to spin rapidly on its axis. It was seen as a curiosity. Meanwhile, practical applications of the turbine can be seen in the water wheel and the windmill . Historians have further traced the theoretical origin of the principles of jet engines to traditional Chinese firework and rocket propulsion systems. Such devices' use for flight
7785-679: The atomic bombing of Hiroshima . By 10 August, the Red Army had begun to occupy the north of Korea. On 10 August in Washington , US Colonels Dean Rusk and Charles H. Bonesteel III were assigned to divide Korea into Soviet and US occupation zones and proposed the 38th parallel as the dividing line. This was incorporated into the US General Order No. 1 , which responded to the Japanese surrender on 15 August. Explaining
7958-664: The gasoline -fuelled HeS 3 of 5 kN (1,100 lbf), which was fitted to Heinkel's simple and compact He 178 airframe and flown by Erich Warsitz in the early morning of August 27, 1939, from Rostock -Marienehe aerodrome , an impressively short time for development. The He 178 was the world's first jet plane. Heinkel applied for a US patent covering the Aircraft Power Plant by Hans Joachim Pabst von Ohain on May 31, 1939; patent number US2256198, with M Hahn referenced as inventor. Von Ohain's design, an axial-flow engine, as opposed to Whittle's centrifugal flow engine,
8131-402: The ram effect of the vehicle's speed instead of a mechanical compressor. The thrust of a typical jetliner engine went from 5,000 lbf (22 kN) ( de Havilland Ghost turbojet) in the 1950s to 115,000 lbf (510 kN) ( General Electric GE90 turbofan) in the 1990s, and their reliability went from 40 in-flight shutdowns per 100,000 engine flight hours to less than 1 per 100,000 in
8304-537: The 1950s, the jet engine was almost universal in combat aircraft, with the exception of cargo, liaison and other specialty types. By this point, some of the British designs were already cleared for civilian use, and had appeared on early models like the de Havilland Comet and Avro Canada Jetliner . By the 1960s, all large civilian aircraft were also jet powered, leaving the piston engine in low-cost niche roles such as cargo flights. The efficiency of turbojet engines
8477-668: The 38th parallel and establishing English as the official language during military control. On 8 September, US Lieutenant General John R. Hodge arrived in Incheon to accept the Japanese surrender south of the 38th parallel. Appointed as military governor, Hodge directly controlled South Korea as head of the United States Army Military Government in Korea (USAMGIK 1945–48). In December 1945, Korea
8650-678: The ANG. In ANG units, the F-100 was eventually replaced by the F-4 Phantom II, LTV A-7D Corsair II , and Fairchild Republic A-10 Thunderbolt II , with the last F-100 retiring in 1979 as the General Dynamics F-16 Fighting Falcon was phased in. In foreign service, the Royal Danish Air Force and Turkish Air Force F-100s soldiered on until 1982. Over the lifetime of its USAF service, 889 F-100s were destroyed in accidents, resulting in
8823-585: The Air Force Council advocated for the development of a refined model of the Sabre 45; furthermore, it agreed with the Aircraft and Weapons Board's recommendation that it be purchased in quantity even prior to flight testing despite the risks involved in this approach. By mid-November 1951, in excess of 100 aircraft configuration change requests had been received, necessitating numerous modifications to
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#17327759769028996-850: The Air National Guard. This included the (120 TFS) of the Colorado Air National Guard , the 136 TFS of the New York Air National Guard TFS, the 174 TFS of the Iowa Air National Guard , and the 188 TFS of the New Mexico Air National Guard . The fifth unit was a regular AF squadron manned by mostly air national guardsmen. The Air National Guard F-100 squadrons increased the regular USAF by nearly 100 Super Sabres in theater, averaging, for
9169-521: The British embassy in Madrid a few years later by his wife, Carlota O'Neill , upon her release from prison. In 1935, Hans von Ohain started work on a similar design to Whittle's in Germany, both compressor and turbine being radial, on opposite sides of the same disc, initially unaware of Whittle's work. Von Ohain's first device was strictly experimental and could run only under external power, but he
9342-705: The Chinese Civil War, while US forces remained stationed in South Korea. By spring 1950, he believed that the strategic situation had changed: PLA forces under Mao Zedong had secured final victory, US forces had withdrawn from Korea, and the Soviets had detonated their first nuclear bomb , breaking the US monopoly. As the US had not directly intervened to stop the communists in China, Stalin calculated they would be even less willing to fight in Korea, which had less strategic significance. The Soviets had cracked
9515-718: The Chinese PLA during the war. North Korea also provided the Chinese Communists in Manchuria with a safe refuge for non-combatants and communications with the rest of China. The North Korean contributions to the Chinese Communist victory were not forgotten after the creation of the People's Republic of China (PRC) in 1949. As a token of gratitude, between 50,000 and 70,000 Korean veterans who served in
9688-664: The Colorado ANG F-100s, 24 missions a day, delivering ordnance and munitions with a 99.5% reliability rate. From May 1968 to April 1969, the ANG Super Sabres flew more than 38,000 combat hours and more than 24,000 sorties. Between them, at the cost of seven F-100 Air Guard pilots killed (plus one staff officer) and the loss of 14 Super Sabres to enemy action, the squadrons expended over four million rounds of 20 mm shells, 30 million pounds of bombs and over 10 million pounds of napalm against their enemy. The Hun
9861-484: The Combat Skyspot program fitted some F-100Ds with an X band radar transmitter to allow for ground-directed bombing in inclement weather or at night. In 1967, the USAF began a structural reinforcement program to extend the aircraft's service life from the designed 3,000 flying hours to 7,000. The USAF alone lost 500 F-100Ds, predominantly in accidents. After one aircraft suffered wing failure, particular attention
10034-649: The F models, included earlier High Wire modifications. New manuals included colored illustrations and had the Roman numeral (I) added after the aircraft number (e.g. T.O. 1F-100D(I)-1S-120, 12 January 1970). High Wire modifications took 60 days per aircraft at a cost for the entire project of US$ 150 million. On 16 April 1961, six Super Sabres were deployed from Clark Air Base in the Philippines to Don Muang Royal Thai Air Force Base in Thailand for air-defense purposes,
10207-656: The F-100 as a matter of urgency, particularly in light of delays experienced in the Republic F-84F Thunderstreak program; furthermore, TAC recommended the production of a day fighter with a secondary fighter-bomber capability that would be suitable not only for the USAF but also foreign nations covered by the Mutual Development Assistance Program . Accordingly, during December 1953, the Air Council opted to alter
10380-406: The F-100 by the placement of the air intake above and behind the cockpit. It was not ultimately produced in quantity, having been passed over in favor of the competing Republic F-105 Thunderchief. On 8 September 1955, North American proposed modifying an F-100C into a two-seat trainer model at no expense to the USAF; two months later, the air council decided to produce the type, perceiving a need for
10553-475: The F-100 was progressively replaced by the F-4 Phantom II and the F-105 Thunderchief. The Hun had logged 360,283 combat sorties during the war and its wartime operations came to end on 31 July 1971. The four fighter wings with F-100s flew more combat sorties in Vietnam than over 15,000 North American P-51 Mustangs had flown during World War II. After 1967, they did not fly into North Vietnam as much and mainly performed close air-support missions for American units in
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#173277597690210726-476: The F-100A officially entered USAF service with the 479th Fighter Wing , based at George AFB , California. By 10 November 1954, the F-100As had suffered six major accidents due to a combination of factors, including flight instability, structural failures, and hydraulic failures, prompting the USAF to ground the entire fleet. During February 1955, the F-100A resumed flight while the 479th was finally declared operational in September 1955. Due to ongoing problems with
10899-437: The F-100A officially entered USAF service, however, as a result of six major accidents occurred by 10 November 1954, the type was grounded while investigations and remedial work were conducted. The F-100 returned to flight in February 1955. In response to the Tactical Air Command 's (TAC) request for a fighter-bomber, the F-100C was developed, followed by the more capable F-100D. Several other models would be developed, including
11072-399: The F-100D, including the new afterburners. Various modifications, largely focused on the structure, were made during the F-100F's service life; several were adapted with special equipment for electronic warfare operations and saw use in this capacity in Vietnam. By June 1970, 74 F-100Fs had been lost in major accidents. The pilot's operating manual warned that the F-100F would not recover from
11245-448: The F-100D. During May 1954, the TAC had requested a more sophisticated fighter-bomber; the company aimed to address the offensive shortcomings of the F-100C by being primarily a ground- attack aircraft with secondary fighter capabilities. To achieve this, the aircraft was fitted with autopilot , upgraded avionics, and starting with the 184th production aircraft, compatibility with the AIM-9 Sidewinder air-to-air missile. To further address
11418-446: The F-86 in response to urgent demands for more aircraft to participate in the Korean War . On 25 May 1953, North American Aviation Chief Test Pilot George Welch conducted the first flight of the YF-100A, seven months ahead of schedule. Once level at 35,000 feet he accelerated to supersonic speed, leaving his chase pilot, ”Pete” Everest well behind in his F-86D . As such, he was the first person to exceed Mach 1 in level flight in
11591-470: The Iraqi Air Force intercepted the flight and fired a Super 530F-1 missile at them. One of the Turkish fighter jets (s/n 56-3903) was shot down and crashed in Zakho valley near the Turkish-Iraqi border. The plane's pilots reportedly survived the crash and were returned to Turkey. The incident was not made public by either side, although some details surfaced in later years. The incident was revealed in 2012 by Turkish Defence Minister İsmet Yılmaz , in response to
11764-432: The MiG-17s had been shot down. Although recorded by the U.S. Air Force as a probable kill, this represented the first aerial victory by the U.S. Air Force in Vietnam. The small force of four MiG-17s, though, had penetrated the escorting F-100s to claim two F-105s. The F-100 was soon replaced by the F-4C Phantom II for MiG CAP, which pilots noted suffered for lacking built-in guns for dogfights. The United States military in
11937-410: The North. On 28 June, Rhee ordered the massacre of suspected political opponents in his own country. In five days, the ROK, which had 95,000 troops on 25 June, was down to less than 22,000 troops. In early July, when US forces arrived, what was left of the ROK was placed under US operational command of the United Nations Command . The Truman administration was unprepared for the invasion. Korea
12110-471: The PLA were sent back along with their weapons, and they later played a significant role in the initial invasion of South Korea. China promised to support the North Koreans in the event of a war against South Korea. By 1948, a North Korea-backed insurgency had broken out in the southern half of the peninsula. This was exacerbated by the undeclared border war between the Koreas, which saw division-level engagements and thousands of deaths on both sides. The ROK
12283-430: The Pratt & Whitney J57 and J75 models. There is also a derivative of the P&W JT8D low-bypass turbofan that creates up to 35,000 horsepower (HP) . Jet engines are also sometimes developed into, or share certain components such as engine cores, with turboshaft and turboprop engines, which are forms of gas turbine engines that are typically used to power helicopters and some propeller-driven aircraft. There are
12456-551: The ROK had 98,000 soldiers (65,000 combat, 33,000 support), no tanks (they had been requested from the U.S. military, but requests were denied), and a 22-plane air force comprising 12 liaison-type and 10 AT-6 advanced-trainer airplanes. Large U.S. garrisons and air forces were in Japan, but only 200–300 U.S. troops were in Korea. At dawn on 25 June 1950, the KPA crossed the 38th parallel behind artillery fire. It justified its assault with
12629-532: The ROK. The final stage would involve destroying South Korean government remnants and capturing the rest of South Korea, including the ports. On 7 June 1950, Kim called for a Korea-wide election on 5–8 August 1950 and a consultative conference in Haeju on 15–17 June. On 11 June, the North sent three diplomats to the South as a peace overture, which Rhee rejected outright. On 21 June, Kim revised his war plan to involve
12802-529: The ROKA launched a three-pronged assault on the insurgents in South Cholla and Taegu . By March 1950, the ROKA claimed 5,621 guerrillas killed or captured and 1,066 small arms seized. This operation crippled the insurgency. Soon after, North Korea made final attempts to keep the uprising active, sending battalion-sized units of infiltrators under the commands of Kim Sang-ho and Kim Moo-hyon. The first battalion
12975-487: The South Korean interior intensified; persistent operations, paired with worsening weather, denied the guerrillas sanctuary and wore away their fighting strength. North Korea responded by sending more troops to link up with insurgents and build more partisan cadres; North Korean infiltrators had reached 3,000 soldiers in 12 units by the start of 1950, but all were destroyed or scattered by the ROKA. On 1 October 1949,
13148-474: The South from 5,000 to 1,000. However, Kim Il Sung believed widespread uprisings had weakened the South Korean military and that a North Korean invasion would be welcomed by much of the South Korean population. Kim began seeking Stalin's support for an invasion in March 1949, traveling to Moscow to persuade him. Stalin initially did not think the time was right for a war in Korea. PLA forces were still embroiled in
13321-435: The South, armed by the U.S. military with mostly small arms, but no heavy weaponry. Several generals, such as Lee Kwon-mu , were PLA veterans born to ethnic Koreans in China. While older histories of the conflict often referred to these ethnic Korean PLA veterans as being sent from northern Korea to fight in the Chinese Civil War before being sent back, recent Chinese archival sources studied by Kim Donggill indicate that this
13494-706: The South. The ROK was being trained by the US Korean Military Advisory Group (KMAG). On the eve of the war, KMAG commander General William Lynn Roberts voiced utmost confidence in the ROK and boasted that any North Korean invasion would merely provide "target practice". For his part, Syngman Rhee repeatedly expressed his desire to conquer the North, including when US diplomat John Foster Dulles visited Korea on 18 June. Though some South Korean and US intelligence officers predicted an attack, similar predictions had been made before and nothing had happened. The Central Intelligence Agency noted
13667-1119: The South. Despite the April 1965 dogfight, which the USAF classified as resulting in a "probable" kill, and no F-100 was ever officially credited with any aerial victories. No F-100 in Vietnam was lost to enemy fighters, but 186 were shot down by antiaircraft fire, seven were destroyed in Vietcong attacks on airbases, and 45 crashed in operational incidents. The F-100 was also the first Wild Weasel air defense suppression aircraft, whose specially trained crews were tasked with locating and destroying enemy missile defenses. Four F-100F Wild Weasel Is were fitted with APR-25 vector radar homing and warning receivers, IR-133 panoramic receivers with greater detection range, and KA-60 panoramic cameras. The APR-25 could detect early-warning radars and emissions from SA-2 Guideline tracking and guidance systems. These aircraft deployed to Korat Royal Thai Air Force Base , Thailand, in November 1965, began flying combat missions with
13840-739: The Soviet Union would not move against US forces in Korea. The Truman administration believed it could intervene in Korea without undermining its commitments elsewhere. On 25 June 1950, the United Nations Security Council unanimously condemned the North Korean invasion of South Korea with Resolution 82 . The Soviet Union, a veto-wielding power , had boycotted Council meetings since January 1950, protesting Taiwan 's occupation of China's permanent seat . The Security Council, on 27 June 1950, published Resolution 83 recommending member states provide military assistance to
14013-772: The UK, and the US decided that "in due course, Korea shall become free and independent". At the Tehran Conference in 1943 and the Yalta Conference in February 1945, the Soviet Union promised to join its allies in the Pacific War within three months of the victory in Europe . Germany officially surrendered on 8 May 1945, and the USSR declared war on Japan and invaded Manchuria on 8 August 1945, two days after
14186-746: The US in 1949. With the end of the war with Japan , the Chinese Civil War resumed in earnest between the Communists and the Nationalist -led government. While the Communists were struggling for supremacy in Manchuria, they were supported by the North Korean government with matériel and manpower. According to Chinese sources, the North Koreans donated 2,000 railway cars worth of supplies while thousands of Koreans served in
14359-631: The USAMGIK declared martial law . Citing the inability of the Joint Commission to make progress, the US government decided to hold an election under UN auspices to create an independent Korea. The Soviet authorities and Korean communists refused to cooperate on the grounds it would not be fair, and many South Korean politicians boycotted it. The 1948 South Korean general election was held in May. The resultant South Korean government promulgated
14532-469: The Vietnam War was not known for using activated Army National Guard, Air National Guard , or other U.S. Reserve units, but rather, relying on conscription during the course of the war. During a confirmation hearing before Congress in 1973, Air Force General George S. Brown , who had commanded the 7th Air Force during the war, stated that five of the best Super Sabre squadrons in Vietnam were from
14705-400: The air/combustion gases to flow more smoothly the engine will be more efficient and use less fuel. A standard definition is used to assess how different things change engine efficiency and also to allow comparisons to be made between different engines. This definition is called specific fuel consumption , or how much fuel is needed to produce one unit of thrust. For example, it will be known for
14878-420: The area to that end. The Truman administration still refrained from committing troops on the ground, because advisers believed the North Koreans could be stopped by air and naval power alone. The Truman administration was uncertain whether the attack was a ploy by the Soviet Union, or just a test of US resolve. The decision to commit ground troops became viable when a communiqué was received on 27 June indicating
15051-484: The area". As Rusk's comments indicate, the US doubted whether the Soviets would agree. Joseph Stalin , however, maintained his wartime policy of cooperation, and on 16 August, the Red Army halted at the 38th parallel for three weeks to await the arrival of US forces. On 7 September 1945, General Douglas MacArthur issued Proclamation No. 1 to the people of Korea, announcing US military control over Korea south of
15224-476: The border, starting in May 1949. Border clashes between South and North continued on 4 August 1949, when thousands of North Korean troops attacked South Korean troops occupying territory north of the 38th parallel. The 2nd and 18th ROK Infantry Regiments repulsed attacks in Kuksa-bong, and KPA troops were "completely routed". Border incidents decreased by the start of 1950. Meanwhile, counterinsurgencies in
15397-704: The border, these guerrillas launched an offensive in September aimed at undermining the South Korean government and preparing the country for the KPA's arrival in force. This offensive failed. However, the guerrillas were now entrenched in the Taebaek-san region of the North Gyeongsang Province and the border areas of the Gangwon Province . While the insurgency was ongoing, the ROKA and KPA engaged in battalion-sized battles along
15570-487: The choice of the 38th parallel, Rusk observed, "Even though it was further north than could be realistically reached by U. S. [ sic ] forces in the event of Soviet disagreement ... we felt it important to include the capital of Korea in the area of responsibility of American troops". He noted that he was "faced with the scarcity of U.S. forces immediately available and time and space factors which would make it difficult to reach very far north before Soviet troops could enter
15743-554: The claim ROK troops attacked first and that the KPA were aiming to arrest and execute the "bandit traitor Syngman Rhee". Fighting began on the strategic Ongjin Peninsula in the west. There were initial South Korean claims that the 17th Regiment had counterattacked at Haeju; some scholars argue the claimed counterattack was instead the instigating attack, and therefore that the South Koreans may have fired first. However,
15916-722: The close proximity of the USSR, if an ICBM were to be launched, they would have only 30 minutes to launch the 614th's aircraft and retire to the nearest German bunker. During the Cuban Missile Crisis , 181 F-100s of the 31st Tactical Fighter Wing , 401st TFW, and 474th TFW were deployed to Homestead Air Force Base as a deterrent and for a potential strike on Cuba during the crisis. On May 2, 1965, 18 USAF F-100s flew from Ramey Air Force Base in Puerto Rico to support Operation Power Pack flying 313 combat sorties before returning to Myrtle Beach on May 28. In 1966,
16089-638: The codes used by the US to communicate with their embassy in Moscow , and reading dispatches convinced Stalin that Korea did not have the importance to the US that would warrant a nuclear confrontation. Stalin began a more aggressive strategy in Asia based on these developments, including promising economic and military aid to China through the Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance . In April 1950, Stalin permitted Kim to attack
16262-492: The combination caused a loss of directional stability at high speeds, so the four tanks were soon replaced by a pair of 450 U.S. gal (1,730 L) drop tanks. The 450s proved scarce and expensive and were often replaced by smaller 335 US gal (1,290 L) tanks. Most troubling to TAC was the fact that, as of 1965, only 125 F-100Cs were capable of using all non-nuclear weapons in the USAF inventory, particularly cluster bombs and AIM-9 Sidewinder air-to-air missiles. By
16435-493: The combustor). The above pressure and temperature are shown on a Thermodynamic cycle diagram. Korean War Korean Demilitarized Zone established Together: 1,742,000 The Korean War (25 June 1950 – 27 July 1953) was an armed conflict on the Korean Peninsula fought between North Korea (Democratic People's Republic of Korea; DPRK) and South Korea (Republic of Korea; ROK) and their allies. North Korea
16608-461: The communist victory in the Chinese Civil War, ethnic Korean units in the PLA were sent to North Korea. In the fall of 1949, two PLA divisions composed mainly of Korean-Chinese troops (the 164th and 166th ) entered North Korea, followed by smaller units throughout the rest of 1949. The reinforcement of the KPA with PLA veterans continued into 1950, with the 156th Division and several other units of
16781-407: The corrections were applied later. Following appropriate remedial work, the USAF opted to partially lift its restrictions on both production and flights of the F-100 in February 1955; deliveries resumed two months later. Various adaptions and derivatives of the F-100 were considered during its development. During mid-1954, an interceptor model of the aircraft was being studied; in July of that year,
16954-529: The country. The Provisional Government of the Republic of Korea was founded in 1919 in Nationalist China . It failed to achieve international recognition, failed to unite the nationalist groups, and had a fractious relationship with its US-based founding president, Syngman Rhee . From 1919 to 1925 and beyond, Korean communists led internal and external warfare against the Japanese. In China,
17127-495: The dangerous flight characteristics, the wingspan was extended by 26 in (66 cm) and the vertical tail area was increased by 27%. In October 1954, an initial production contract was issued for the F-100D, follow-on contracts would be issued in March and December of the following year. On 24 January 1956, the first F-100D (54–2121) flew, piloted by Daniel Darnell. In December 1954, a new General Operational Requirement, GOR 68,
17300-632: The date of its commencement on 25 June. In North Korea, the war is officially referred to as the Fatherland Liberation War ( Choguk haebang chŏnjaeng ) or the " Chosŏn [Korean] War" ( 조선전쟁 ; Chosŏn chŏnjaeng ). In mainland China, the segment of the war after the intervention of the People's Volunteer Army is commonly and officially known as the "Resisting America and Assisting Korea War" ( Chinese : 抗美援朝战争 ; pinyin : Kàngměi Yuáncháo Zhànzhēng ), although
17473-762: The deaths of 324 pilots. The deadliest year for F-100 accidents was 1958, which saw 116 aircraft destroyed and 47 pilots killed. After F-100s were withdrawn from service, a large number were converted into remote-controlled drones (QF-100) under the USAF Full Scale Aerial Target (FSAT) program for use as targets for various antiaircraft weapons, including missile-carrying fighters and fighter-interceptors, with FSAT operations being conducted primarily at Tyndall AFB , Florida. A few F-100s also found their way into civilian hands, primarily with defense contractors supporting USAF and NASA flight test activities at Edwards AFB, California. North American received
17646-577: The defense of Italy and Greece, and the country was first on the list of the National Security Council 's post-North Korea invasion list of "chief danger spots". Truman believed if aggression went unchecked, a chain reaction would start that would marginalize the UN and encourage communist aggression elsewhere. The UN Security Council approved the use of force to help the South Koreans, and the US immediately began using air and naval forces in
17819-599: The divergent area is less than required to give complete internal expansion to ambient pressure as a trade-off with external body drag. Whitford gives the F-16 as an example. Other underexpanded examples were the XB-70 and SR-71. The nozzle size, together with the area of the turbine nozzles, determines the operating pressure of the compressor. This overview highlights where energy losses occur in complete jet aircraft powerplants or engine installations. A jet engine at rest, as on
17992-844: The drop tanks. Once pilot training was completed in April 1955, three aircraft were deployed to Bitburg Air Base in Germany, flying to Brookley AFB in Mobile, Alabama, cocooned, loaded on an aircraft carrier and delivered to Short Brothers at Sydenham, Belfast, for reassembly and flight preparation. At Bitburg, they were assigned to Detachment 1 of the 7407th Support Squadron, and commenced operations flying over Eastern Bloc countries at high altitude (over 50,000 ft) to acquire intelligence on military targets. Many attempts were made to intercept these aircraft to no avail, with some photos of fighter airfields clearly showing aircraft climbing for attempted intercepts. The European detachment probably only carried out six missions between mid-1955 and mid-1956 when
18165-509: The economic and military aid promised by the Soviets. Kathryn Weathersby cites Soviet documents which said Kim secured Mao's support. Along with Mark O'Neill, she says this accelerated Kim's war preparations. Chen Jian argues Mao never seriously challenged Kim's plans and Kim had every reason to inform Stalin that he had obtained Mao's support. Citing more recent scholarship, Zhao Suisheng contends Mao did not approve of Kim's war proposal and requested verification from Stalin, who did so via
18338-560: The end of World War II in 1945, Korea, which had been a Japanese colony for 35 years, was divided by the Soviet Union and the US into two occupation zones at the 38th parallel , with plans for a future independent state. Due to political disagreements and influence from their backers, the zones formed their own governments in 1948. The DPRK was led by Kim Il Sung in Pyongyang , and the ROK by Syngman Rhee in Seoul ; both claimed to be
18511-405: The end of World War II were unsuccessful. Even before the start of World War II, engineers were beginning to realize that engines driving propellers were approaching limits due to issues related to propeller efficiency, which declined as blade tips approached the speed of sound . If aircraft performance were to increase beyond such a barrier, a different propulsion mechanism was necessary. This
18684-425: The engine is controlled primarily by the operating conditions inside the engine which are the pressure produced by the compressor and the temperature of the combustion gases at the first set of rotating turbine blades. The pressure is the highest air pressure in the engine. The turbine rotor temperature is not the highest in the engine but is the highest at which energy transfer takes place ( higher temperatures occur in
18857-650: The engine, producing thrust. All the air entering the compressor is passed through the combustor, and turbine, unlike the turbofan engine described below. Turbofans differ from turbojets in that they have an additional fan at the front of the engine, which accelerates air in a duct bypassing the core gas turbine engine. Turbofans are the dominant engine type for medium and long-range airliners . Turbofans are usually more efficient than turbojets at subsonic speeds, but at high speeds their large frontal area generates more drag . Therefore, in supersonic flight, and in military and other aircraft where other considerations have
19030-555: The exchange of prisoners and created a 4-kilometre (2.5 mi) wide Demilitarized Zone (DMZ) along the frontline, with a Joint Security Area at Panmunjom . The conflict caused more than 1 million military deaths and an estimated 2 to 3 million civilian deaths, a larger proportion of civilian deaths than in World War II or the Vietnam War . Alleged war crimes include the mass killing of suspected communists by Seoul and
19203-682: The fighters for operational suitability tests while the other two aircraft underwent armament tests by the Air Force Armament Center. The Tactical Air Division of the AFOTC conducted the APGC testing under the direction of project office Lieutenant Colonel Henry W. Brown ; initial testing was completed by APGC personnel at Edwards Air Force Base . Despite these shortcomings, the Tactical Air Command (TAC) advocated for
19376-675: The first F-100D shot down by ground fire, piloted by 1st Lt Colin A. Clarke, of the 428th TFS ; Clarke ejected and survived. On 4 April 1965, as escorts protecting F-105s attacking the Thanh Hoa Bridge , F-100 Super Sabres fought the USAF's first air-to-air jet combat duel in the Vietnam War, in which an F-100 piloted by Captain Donald W. Kilgus of the 416th Fighter Squadron shot down a North Vietnamese Air Force MiG-17 , using cannon fire, while another fired AIM-9 Sidewinder missiles. The surviving North Vietnamese pilot confirmed three of
19549-655: The first F-100s to enter combat in Southeast Asia. From that date until their redeployment in 1971, the F-100s were the longest serving U.S. jet fighter-bomber to fight in the Vietnam War. They served as MiG combat air patrol (CAP) escorts for F-105 Thunderchiefs, Misty forward air control (FAC) , and Wild Weasel anti-air defense aircraft over North Vietnam, and were then relegated to close air support and ground attacks within South Vietnam. On 18 August 1964,
19722-467: The first ground attacks and air combat victories of jet planes. Following the end of the war the German jet aircraft and jet engines were extensively studied by the victorious allies and contributed to work on early Soviet and US jet fighters. The legacy of the axial-flow engine is seen in the fact that practically all jet engines on fixed-wing aircraft have had some inspiration from this design. By
19895-561: The first production aircraft followed in January 1955. In response to observed improvements in fighters deployed by the Soviet Union , the USAF directed production of the F-100 to be accelerated via the establishment of a second production line in Columbus in September 1954. During November 1954, production of the F-100 was reduced to 24 aircraft per month in response to a spate of fatal accidents. Aircraft already built were stored and
20068-473: The first time, followed by the first production F-100A on 29 October 1953. This first F-100A was put through extensive testing to help develop fixes for identified deficiencies. Progress on the project was setback by a three-month general strike by North American employees in late 1953. An operational evaluation of the F-100A was conducted by the USAF November 1953 and December 1955, it determined that
20241-712: The form of rocket engines they power model rocketry , spaceflight , and military missiles . Jet engines have propelled high speed cars, particularly drag racers , with the all-time record held by a rocket car . A turbofan powered car, ThrustSSC , currently holds the land speed record . Jet engine designs are frequently modified for non-aircraft applications, as industrial gas turbines or marine powerplants . These are used in electrical power generation, for powering water, natural gas, or oil pumps, and providing propulsion for ships and locomotives. Industrial gas turbines can create up to 50,000 shaft horsepower. Many of these engines are derived from older military turbojets such as
20414-459: The former Fourth Field Army arriving in February; the PLA 156th Division was reorganized as the KPA 7th Division. By mid-1950, between 50,000 and 70,000 former PLA troops had entered North Korea, forming a significant part of the KPA's strength on the eve of the war's beginning. The combat veterans and equipment from China, the tanks, artillery, and aircraft supplied by the Soviets, and rigorous training increased North Korea's military superiority over
20587-472: The government and between 2,976 and 3,392 deaths. By May 1949, both uprisings had been crushed. Insurgency reignited in the spring of 1949 when attacks by guerrillas in the mountainous regions (buttressed by army defectors and North Korean agents) increased. Insurgent activity peaked in late 1949 as the ROKA engaged so-called People's Guerrilla Units. Organized and armed by the North Korean government, and backed by 2,400 KPA commandos who had infiltrated through
20760-580: The government in the South, under the condition that Mao would agree to send reinforcements if needed. For Kim, this was the fulfillment of his goal to unite Korea. Stalin made it clear Soviet forces would not openly engage in combat, to avoid a direct war with the US Kim met with Mao in May 1950 and differing historical interpretations of the meeting have been put forward. According to Barbara Barnouin and Yu Changgeng, Mao agreed to support Kim despite concerns of American intervention, as China desperately needed
20933-634: The government. At 02:00 on 28 June the ROK blew up the Hangang Bridge across the Han River in an attempt to stop the KPA. The bridge was detonated while 4,000 refugees were crossing it, and hundreds were killed. Destroying the bridge trapped many ROK units north of the river. In spite of such desperate measures, Seoul fell that same day. Some South Korean National Assemblymen remained in Seoul when it fell, and 48 subsequently pledged allegiance to
21106-670: The ground personnel had to spend over 100 hours on the aircraft maintenance. All of the RF-100As were returned to the US after one year and 11 months (1 January 1959 – 1 December 1960) in ROCAF service. The costs are in contemporary United States dollars and have not been adjusted for inflation. Jet engine A jet engine is a type of reaction engine , discharging a fast-moving jet of heated gas (usually air) that generates thrust by jet propulsion . While this broad definition may include rocket , water jet , and hybrid propulsion,
21279-631: The gun and ammunition bays were covered by a bulged fairing under the forward fuselage. Pilots trained on the F-100A at Edwards Air Force Base and George Air Force Base in California and then at Palmdale Air Force Base for training with the actual RF-100As with which they would be deployed. Flight tests revealed that the RF-100A in its intended operational fit of four external tanks was lacking in directional and longitudinal stability, requiring careful handling and close attention to speed limitations for
21452-780: The influence of China over Korea in the First Sino-Japanese War (1894–95), ushering in the short-lived Korean Empire . A decade later, after defeating Imperial Russia in the Russo-Japanese War , Japan made the Korean Empire its protectorate with the Eulsa Treaty in 1905, then annexed it with the Japan–Korea Treaty of 1910 . The Korean Empire fell, and Korea was directly ruled by Japan between 1910–45. Many Korean nationalists fled
21625-761: The insurgent war and border clashes. The first socialist uprising occurred without direct North Korean participation, though the guerrillas still professed support for the northern government. Beginning in April 1948 on Jeju Island , the campaign saw arrests and repression by the South Korean government in the fight against the South Korean Labor Party, resulting in 30,000 violent deaths, among them 14,373 civilians, of whom ~2,000 were killed by rebels and ~12,000 by ROK security forces. The Yeosu–Suncheon rebellion overlapped with it, as several thousand army defectors waving red flags massacred right-leaning families. This resulted in another brutal suppression by
21798-399: The integration of black boxes with the yaw and pitch axis, the reshaping of the vertical tail surfaces, shortening of the tailfin, and increased chord of the rudder . Another control problem suffered by the type stemmed from the handling characteristics of the swept wing at high angles of attack : as the aircraft approached stall speeds, loss of lift on the tips of the wings caused
21971-499: The invasion force, the North had 114 fighters, 78 bombers, 105 T-34-85 tanks, and some 30,000 soldiers stationed in reserve in North Korea. Although each navy consisted of only several small warships, the North and South Korean navies fought in the war as seaborne artillery for their armies. In contrast, the South Korean population was estimated at 20 million, but its army was unprepared and ill-equipped. As of 25 June 1950,
22144-546: The invasion. UN forces comprised 21 countries, with the US providing around 90% of military personnel. Seoul was captured on 28 June, and by early August, the Republic of Korea Army (ROKA) and its allies were nearly defeated, holding onto only the Pusan Perimeter in the peninsula's southeast. On 15 September, UN forces landed at Inchon near Seoul, cutting off KPA troops and supply lines. UN forces broke out from
22317-458: The late 1990s. This, combined with greatly decreased fuel consumption, permitted routine transatlantic flight by twin-engined airliners by the turn of the century, where previously a similar journey would have required multiple fuel stops. The principle of the jet engine is not new; however, the technical advances necessary to make the idea work did not come to fruition until the 20th century. A rudimentary demonstration of jet power dates back to
22490-540: The more capable subsonic LTV A-7 Corsair II , General Dynamics F-111 Aardvark , and the McDonnell Douglas F-4 Phantom II . 242 F-100s of various models were lost over Vietnam. Several F-100As were rebuilt into RF-100A aerial reconnaissance aircraft. Several F-100Fs were modified into electronic warfare platforms. Several proposed models and derivatives, such as the F-100B interceptor and
22663-553: The nationalist National Revolutionary Army and the communist People's Liberation Army (PLA) helped organize Korean refugees against the Japanese military, which had also occupied parts of China. The Nationalist-backed Koreans, led by Yi Pom-Sok , fought in the Burma campaign (1941-45). The communists, led by, among others, Kim Il Sung , fought the Japanese in Korea and Manchuria . At the Cairo Conference in 1943, China,
22836-394: The net thrust of a rocket engine is: Where F N {\displaystyle F_{N}} is the net thrust, I sp,vac {\displaystyle I_{\text{sp,vac}}} is the specific impulse , g 0 {\displaystyle g_{0}} is a standard gravity , m ˙ {\displaystyle {\dot {m}}}
23009-629: The new aircraft possessed superior performance to existing USAF fighters, but declared that it was not ready for widescale deployment due to various deficiencies and functional difficulties in the design. These findings were subsequently confirmed during operational suitability tests performed under "Project Hot Rod". During August 1954, six F-100s arrived at the Air Proving Ground Command (APGC), Eglin Air Force Base . The Air Force Operational Test Center (AFOTC) used four of
23182-404: The nozzle but their static values drop as the gas speeds up. The velocity of the air entering the nozzle is low, about Mach 0.4, a prerequisite for minimizing pressure losses in the duct leading to the nozzle. The temperature entering the nozzle may be as low as sea level ambient for a fan nozzle in the cold air at cruise altitudes. It may be as high as the 1000 Kelvin exhaust gas temperature for
23355-472: The operation was conducted under the auspices of the UN. It has been sometimes referred to in the English-speaking world as "The Forgotten War" or "The Unknown War" because of the lack of public attention it received during and afterward, relative to the global scale of World War II, which preceded it, and the subsequent angst of the Vietnam War , which succeeded it. Imperial Japan diminished
23528-505: The original afterburners of the J-57 engines with the more advanced afterburners from retired Convair F-102 Delta Dagger interceptors. This modification changed the appearance of the aft end of the F-100, doing away with the original "petal-style" exhaust. The afterburner modification started in the 1970s and solved maintenance problems with the old type, as well as operational problems, including compressor stall problems. On 27 September 1954,
23701-526: The original design; several of these alterations were focused on its armaments and were intended to improve its lethality. The new aircraft was accepted as the F-100 on 30 November 1951. On 3 January 1952, the USAF placed an order for two prototypes; one month later, a follow-on production order was issued for 23 F-100As while an additional 250 F-100As were ordered in August of that year as well. Around this time, development work slowed considerably while North American focused on improving and ramping up production of
23874-838: The other due to an engine flame-out. In mid-1958, all four remaining RF-100As were returned to the US and later supplied to the Republic of China Air Force in Taiwan. "High Wire" was a modernization program performed upon selected F-100Cs, F-100Ds and F-100Fs. It comprised two modifications - an electrical rewiring upgrade and a heavy maintenance and inspect-and-repair as necessary (IRAN) upgrade. Rewiring upgrade operations consisted of replacing old wiring and harnesses with improved maintainable designs. Heavy maintenance and IRAN included new kits, modifications, standardized configurations, repairs, replacements, and complete refurbishment. This project required all new manuals and incremented (i.e. -85 to -86) block numbers. All later-production models, especially
24047-749: The perimeter on 18 September, re-captured Seoul, and invaded North Korea in October, capturing Pyongyang and advancing towards the Yalu River —the border with China. On 19 October, the Chinese People's Volunteer Army (PVA) crossed the Yalu and entered the war on the side of the north. UN forces retreated from North Korea in December, following the PVA's first and second offensive . Communist forces captured Seoul again in January 1951 before losing it to
24220-407: The program, reducing the outstanding total orders for the F-100A by 70 aircraft in favor of a new fighter-bomber variant that would be capable of delivering nuclear bombs . In February 1954, the USAF would issue the first production contract for this fighter-bomber model, the F-100C ; equipped to carry additional munitions and fuel tanks, the prototype performed its maiden flight one month later while
24393-524: The refueling probes had a tendency to break away during high-speed maneuvers. During 1959, 65 aircraft were modified to also fire the AGM-12 Bullpup air-to-ground missile. Numerous post-production fixes created such a diversity of capabilities between individual aircraft that by 1965, around 700 F-100Ds underwent High Wire modifications to standardize the weapon systems. On 26 March 1958, an F-100D fitted with an Astrodyne booster rocket making 150,000 lbf (670,000 N) of thrust successfully performed
24566-442: The report that contained the Haeju claim contained errors and outright falsehoods. KPA forces attacked all along the 38th parallel within an hour. The KPA had a combined arms force including tanks supported by heavy artillery. The ROK had no tanks, anti-tank weapons, or heavy artillery. The South Koreans committed their forces in a piecemeal fashion, and these were routed in a few days. On 27 June, Rhee evacuated Seoul with some of
24739-472: The return flight from Algeria. The F-100 was the main fighter-bomber operated by the French Air Force during the 1960s until the type was replaced by the SEPECAT Jaguar . Turkish Air Force F-100 units were used during the Turkish invasion of Cyprus in 1974. Together with Lockheed F-104G Starfighters , they provided close air support to Turkish ground troops and bombed targets around Nicosia. Following previous intrusions in Soviet air space, on 24 August 1976,
24912-424: The same basic physical principles of thrust as a form of reaction engine , but is distinct from the jet engine in that it does not require atmospheric air to provide oxygen; the rocket carries all components of the reaction mass. However some definitions treat it as a form of jet propulsion . Because rockets do not breathe air, this allows them to operate at arbitrary altitudes and in space. This type of engine
25085-411: The sole legitimate government of all of Korea and engaged in border clashes as internal unrest was fomented by communist groups in the south. On 25 June 1950, the Korean People's Army (KPA), equipped and trained by the Soviets, launched an invasion of the south. In the absence of the Soviet Union's representative, the UN Security Council denounced the attack and recommended member states to repel
25258-444: The southward movement by the KPA but assessed this as a "defensive measure" and concluded an invasion was "unlikely". On 23 June UN observers inspected the border and did not detect that war was imminent. Chinese involvement was extensive from the beginning, building on previous collaboration between the Chinese and Korean communists during the Chinese Civil War. Throughout 1949 and 1950, the Soviets continued arming North Korea. After
25431-436: The state of the art in compressors. Alan Arnold Griffith published An Aerodynamic Theory of Turbine Design in 1926 leading to experimental work at the RAE . In 1928, RAF College Cranwell cadet Frank Whittle formally submitted his ideas for a turbojet to his superiors. In October 1929, he developed his ideas further. On 16 January 1930, in England, Whittle submitted his first patent (granted in 1932). The patent showed
25604-408: The term jet engine typically refers to an internal combustion air-breathing jet engine such as a turbojet , turbofan , ramjet , pulse jet , or scramjet . In general, jet engines are internal combustion engines . Air-breathing jet engines typically feature a rotating air compressor powered by a turbine , with the leftover power providing thrust through the propelling nozzle —this process
25777-431: The term " Chosŏn War" ( Chinese : 朝鮮戰爭 ; pinyin : Cháoxiǎn Zhànzhēng ) is sometimes used unofficially. The term " Hán (Korean) War" ( Chinese : 韓戰 ; pinyin : Hán Zhàn ) is most used in Taiwan (Republic of China), Hong Kong and Macau . In the US, the war was initially described by President Harry S. Truman as a " police action " as the US never formally declared war on its opponents, and
25950-552: The time the F-100C was phased out in June 1970, 85 had been lost in major accidents. The F-100D entered service on 29 September 1956 with the 405th Fighter Wing at Langley AFB . The model exhibited reliability problems from the onset, particularly with the constant-speed inverter which provided constant-frequency current to the electrical systems. This unit was so unreliable that the USAF required it to have its own oil system to minimize damage in case of failure. Landing gear and brake parachute malfunctions claimed several aircraft while
26123-458: The torture and starvation of prisoners of war by Pyongyang. North Korea became one of the most heavily bombed countries in history, and virtually all of Korea's major cities were destroyed. No peace treaty has been signed, making the war a frozen conflict . In South Korea, the war is usually referred to as the "625 War" ( 6·25 전쟁 ; 六二五戰爭 ), the "625 Upheaval" ( 6·25 동란 ; 六二五動亂 ; yugio dongnan ), or simply "625", reflecting
26296-432: The turbines. Ram compression jet engines are airbreathing engines similar to gas turbine engines in so far as they both use the Brayton cycle . Gas turbine and ram compression engines differ, however, in how they compress the incoming airflow. Whereas gas turbine engines use axial or centrifugal compressors to compress incoming air, ram engines rely only on air compressed in the inlet or diffuser. A ram engine thus requires
26469-447: The two-seat F-100F supersonic trainer. As early as 1958, the USAF began to withdraw its F-100As, but returned them to service during early 1962 amid escalating world tensions. Many F-100s saw combat use during the Vietnam War before being superseded by the high-speed Republic F-105 Thunderchief in the strike mission. The F-100 flew extensively over South Vietnam as the air force's primary close air support aircraft until being replaced by
26642-404: The type, the USAF opted to start phasing out the F-100A during 1958. Many of these aircraft were reallocated to Air National Guard (ANG) units while others were given to the Chinese Nationalist Air Force . During 1961, the withdrawal of all USAF F-100As had been completed; by that time, 47 aircraft had been lost in major accidents. However, as a result of escalating world tensions in response to
26815-552: Was able to demonstrate the basic concept. Ohain was then introduced to Ernst Heinkel , one of the larger aircraft industrialists of the day, who immediately saw the promise of the design. Heinkel had recently purchased the Hirth engine company, and Ohain and his master machinist Max Hahn were set up there as a new division of the Hirth company. They had their first HeS 1 centrifugal engine running by September 1937. Unlike Whittle's design, Ohain used hydrogen as fuel, supplied under external pressure. Their subsequent designs culminated in
26988-417: Was administered by a US–Soviet Union Joint Commission , as agreed at the Moscow Conference , to grant independence after a five-year trusteeship. Waiting five years for independence was unpopular among Koreans, and riots broke out. To contain them, the USAMGIK banned strikes on 8 December and outlawed the PRK Revolutionary Government and People's Committees on 12 December. Following further civilian unrest,
27161-414: Was almost entirely trained and focused on counterinsurgency, rather than conventional warfare. They were equipped and advised by a force of a few hundred American officers, who were successful in helping the ROKA to subdue guerrillas and hold its own against North Korean military (Korean People's Army, KPA) forces along the 38th parallel. Approximately 8,000 South Korean soldiers and police officers died in
27334-421: Was also deployed as a two-seat F-100F model, which served as a "fast FAC" or Misty FAC in North Vietnam and Laos, spotting targets for other fighter-bomber aircraft, performing road reconnaissance, and conducting search-and-rescue missions as part of the top-secret Commando Sabre project, based out of Phu Cat and Tuy Hoa air bases. By the conflict's end, 242 F-100s of various models had been lost in Vietnam, as
27507-406: Was built in 1903 by Norwegian engineer Ægidius Elling . Such engines did not reach manufacture due to issues of safety, reliability, weight and, especially, sustained operation. The first patent for using a gas turbine to power an aircraft was filed in 1921 by Maxime Guillaume . His engine was an axial-flow turbojet, but was never constructed, as it would have required considerable advances over
27680-480: Was eventually adopted by most manufacturers by the 1950s. Austrian Anselm Franz of Junkers ' engine division ( Junkers Motoren or "Jumo") introduced the axial-flow compressor in their jet engine. Jumo was assigned the next engine number in the RLM 109-0xx numbering sequence for gas turbine aircraft powerplants, "004", and the result was the Jumo 004 engine. After many lesser technical difficulties were solved, mass production of this engine started in 1944 as
27853-412: Was granted a patent for a jet engine design in March 1935. Republican president Manuel Azaña arranged for initial construction at the Hispano-Suiza aircraft factory in Madrid in 1936, but Leret was executed months later by Francoist Moroccan troops after unsuccessfully defending his seaplane base on the first days of the Spanish Civil War . His plans, hidden from Francoists, were secretly given to
28026-437: Was issued by the USAF; it called for a tactical fighter-bomber that would also be effective as an aerial superiority fighter under both day and night conditions. North American opted to respond with a heavily modified version of the F-100; the design was so substantially different that it was promptly decided to redesignate it as the F-107 . Intended for speeds as high as Mach 2, the aircraft could be easily distinguished from
28199-517: Was named Sabre 45 in reference to its 45° wing sweep and essentially represented an evolution of the company's successful F-86 Sabre. In January 1951, the company delivered an unsolicited proposal for a supersonic day fighter to the United States Air Force (USAF). On 7 July 1951, a mockup of the aircraft was presented for inspection; the USAF produced a general operational requirement that called for an air superiority weapon to be operational no later than 1957, preferably by 1955. During October 1951,
28372-442: Was no US policy dealing with South Korea directly as a national interest, its proximity to Japan increased its importance. Said Kim: "The recognition that the security of Japan required a non-hostile Korea led directly to President Truman's decision to intervene ... The essential point ... is that the American response to the North Korean attack stemmed from considerations of U.S. policy toward Japan." Another consideration
28545-401: Was not included in the strategic Asian Defense Perimeter outlined by United States Secretary of State Dean Acheson . Military strategists were more concerned with the security of Europe against the Soviet Union than that of East Asia . The administration was worried a war in Korea could quickly escalate without American intervention. Diplomat John Foster Dulles stated: "To sit by while Korea
28718-770: Was not the case. Rather, the soldiers were indigenous to China, as part of China's longstanding ethnic Korean community, and were recruited to the PLA in the same way as any other Chinese citizen. According to the first official census in 1949, the population of North Korea numbered 9,620,000, and by mid-1950, North Korean forces numbered between 150,000 and 200,000 troops, organized into 10 infantry divisions, one tank division, and one air force division, with 210 fighter planes and 280 tanks, who captured scheduled objectives and territory, among them Kaesong, Chuncheon , Uijeongbu , and Ongjin. Their forces included 274 T-34-85 tanks, 200 artillery pieces, 110 attack bombers, 150 Yak fighter planes, and 35 reconnaissance aircraft. In addition to
28891-465: Was paid to lining the wings with external bracing strips. During the Vietnam War, combat losses constituted as many as 50 aircraft per year. After a major accident, the USAF Thunderbirds reverted from F-105 Thunderchiefs to the F-100D, which they operated from 1964 until it was replaced by the McDonnell Douglas F-4 Phantom II in 1968. By 1972, the F-100 was mostly phased out of USAF active service and turned over to tactical fighter groups and squadrons in
29064-402: Was reasonably addressed with the installation of a yaw damper in the 146th F-100C, which was later retrofitted to earlier aircraft. A pitch damper was added, starting with the 301st F-100C, at a cost of US$ 10,000 per aircraft. The addition of "wet" hardpoints meant the F-100C could carry a pair of 275 U.S. gal (1,040 L) and a pair of 200 U.S. gal (770 L) drop tanks. However,
29237-498: Was reduced to a single man over the course of engagements by the ROKA 8th Division . The second was annihilated by a two-battalion hammer-and-anvil maneuver by units of the ROKA 6th Division , resulting in a toll of 584 KPA guerrillas (480 killed, 104 captured) and 69 ROKA troops killed, plus 184 wounded. By the spring of 1950, guerrilla activity had mostly subsided; the border, too, was calm. By 1949, South Korean and US military actions had reduced indigenous communist guerrillas in
29410-427: Was still rather worse than piston engines, but by the 1970s, with the advent of high-bypass turbofan jet engines (an innovation not foreseen by the early commentators such as Edgar Buckingham , at high speeds and high altitudes that seemed absurd to them), fuel efficiency was about the same as the best piston and propeller engines. Jet engines power jet aircraft , cruise missiles and unmanned aerial vehicles . In
29583-443: Was supported by the People's Republic of China and the Soviet Union , while South Korea was supported by the United Nations Command (UNC) led by the United States . The conflict was thus the first major proxy war of the Cold War between the Soviet Union and US. Fighting ended in 1953 with an armistice but no peace treaty , leading to the ongoing Korean conflict characterized by phases of diplomacy and confrontation. After
29756-429: Was the Soviet reaction if the US intervened. The Truman administration was fearful a Korean war was a diversionary assault that would escalate to a general war in Europe once the US committed in Korea. At the same time, "[t]here was no suggestion from anyone that the United Nations or the United States could back away from [the conflict]". Yugoslavia —a possible Soviet target because of the Tito-Stalin split —was vital to
29929-409: Was the motivation behind the development of the gas turbine engine, the most common form of jet engine. The key to a practical jet engine was the gas turbine , extracting power from the engine itself to drive the compressor . The gas turbine was not a new idea: the patent for a stationary turbine was granted to John Barber in England in 1791. The first gas turbine to successfully run self-sustaining
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