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110-399: The CASA C-101 Aviojet is a low-wing single engine jet-powered advanced trainer and light attack aircraft designed and manufactured by Spanish aircraft company Construcciones Aeronáuticas SA (CASA). The C-101 was developed in response to a Spanish Air Force requirement, which needed a replacement for the outdated Hispano Saeta . During 1975, CASA commenced work on what would become

220-462: A Görz , in 1913. French Military Aviation began the war with several squadrons of Bleriot observation planes, equipped with cameras for reconnaissance. The French Army developed procedures for getting prints into the hands of field commanders in record time. The Royal Flying Corps recon pilots began to use cameras for recording their observations in 1914 and by the Battle of Neuve Chapelle in 1915

330-399: 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

440-534: A pressurized escape capsule for the pilot. The aircraft never flew under rocket power with only unpowered glider prototypes flown prior to May 1945. The collection and interpretation of aerial reconnaissance intelligence became a considerable enterprise during the war. Beginning in 1941, RAF Medmenham was the main interpretation centre for photographic reconnaissance operations in the European and Mediterranean theatres. The Central Interpretation Unit (CIU)

550-680: A rotating air compressor powered by a turbine , with the leftover power providing thrust through the propelling nozzle —this process 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

660-499: A block of land stretching from the Turkish front lines 32 miles (51 km) deep into their rear areas. Beginning 5 January, they flew with a fighter escort to ward off enemy fighters. Using Royal Aircraft Factory BE.12 and Martinsyde airplanes, they not only overcame enemy air attacks, but also bucked 65 mile-per-hour winds, anti-aircraft fire, and malfunctioning equipment to complete their task circa 19 January 1918. During 1928,

770-497: A commercial engine that had been re-developed for military use. Even from an early stage of development, the TFE731 was viewed as a front runner for the aircraft. According to Fredriksen, it provided relatively favourable performance and a high level of fuel economy amongst its peers. Overall, the aircraft provided mainly favourable characteristics while remaining an affordable trainer in comparison to international competition. Although

880-408: 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

990-627: A conventional war. A few days later, on 16 October 1912, a Bulgarian Albatros aircraft performed one of Europe's first reconnaissance flight in combat conditions, against the Turkish lines on the Balkan peninsula , during the Balkan Wars of 1912–1913. The use of aerial photography rapidly matured during the First World War , as aircraft used for reconnaissance purposes were outfitted with cameras to record enemy movements and defences. At

1100-481: A dedicated trainer version, designated as C-101EB-01 by CASA and E.25 Mirlo ("Blackbird") by the air force. On 17 March 1980, the first aircraft entered service with the Spanish Air Force. Shortly after this dedicated trainer model was introduced, the aircraft was followed in production by a combination attack/trainer variant. Equipped with an uprated engine, this variant was designated C-101BB-02 . It

1210-427: 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

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1320-406: 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

1430-426: 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

1540-761: A means of attaching a camera to a large calibre artillery projectile or rocket, and this inspired Alfred Maul to develop his Maul Camera Rockets starting in 1903. Alfred Nobel in 1896 had already built the first rocket carrying a camera, which took photographs of the Swedish landscape during its flights. Maul improved his camera rockets and the Austrian Army even tested them in the Turkish-Bulgarian War in 1912 and 1913, but by then and from that time on camera-carrying aircraft were found to be superior. The first use of airplanes in combat missions

1650-446: A new jet trainer to replace its aging fleet of Hispano HA-200s and Ha.220s. Akin to the majority of contemporary European jet trainers, it was also to have a limited attack capability. During 1972, Hispano had been absorbed by Spanish aircraft company Construcciones Aeronáuticas SA (CASA), who took an interest in the trainer requirement. During October 1975, CASA was awarded a development contract based upon their submission, requiring

1760-471: A pair of static airframes and four flight-capable prototypes to be built for testing purposes at a cost of 1,297 million pesetas ($ 22 million). To develop the aircraft, CASA sought technical assistance from abroad. Both the German manufacturing conglomerate Messerschmitt-Bölkow-Blohm (MBB) and American defense company Northrop opted to participate in the venture; specifically, engineers at MBB worked on

1870-435: 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

1980-759: 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

2090-466: A stereoscope, thus creating a perception of depth that could aid in cartography and in intelligence derived from aerial images. The dirigibles were eventually allocated to the Royal Navy , so Laws formed the first aerial reconnaissance unit of fixed-wing aircraft; this became No. 3 Squadron RAF . Germany was one of the first countries to adopt the use of a camera for aerial reconnaissance, opting for

2200-530: 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

2310-439: 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

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2420-421: 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

2530-484: A system called Tactical Airborne Reconnaissance Pod System (TARPS), which provided naval aerial reconnaissance capability until the Tomcat's retirement in 2006. Since the 1980s, there has been an increasing tendency for militaries to rely upon assets other than manned aircraft to perform aerial reconnaissance. Alternative platforms include the use of surveillance satellites and unmanned aerial vehicles (UAVs), such as

2640-402: 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

2750-472: A twin-engined aircraft designed expressly for the reconnaissance role with defensive armament of 1 light machine gun, entered service in 1941. Codenamed "Dinah" this aircraft was fast, elusive and proved difficult for Allied fighters to destroy. More than 1,500 Ki-46s were built and its performance was upgraded later in the war with the Ki-46-III variant. Another purpose-designed reconnaissance aircraft for

2860-461: 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

2970-493: 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, 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

3080-507: 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

3190-443: 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

3300-400: 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

3410-570: 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

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3520-587: The 1794 conflict with Austria , where in the Battle of Fleurus they gathered information. Moreover, the presence of the balloon had a demoralizing effect on the Austrian troops, which improved the likelihood of victory for the French troops. To operate such balloons, a new unit of the French military, the French Aerostatic Corps , was established; this organisation has been recognised as being

3630-572: The B-24 Liberator (photo-reconnaissance variant designated F-7), B-25 Mitchell (F-10) and B-17 Flying Fortress (F-9). The revolutionary B-29 Superfortress was the world's largest combat-operational bomber when it appeared in 1944, with a top speed of over 350 mph which at that time was outstanding for such a large and heavy aircraft; the B-29 also had a pressurized cabin for high altitude flight. The photographic reconnaissance version of

3740-633: The C-101CC-04 were sold to Jordan . During 2018, the last of these aircraft were phased out by the Royal Jordanian Air Force . The final version of the C-101 to be developed, designated C-101DD , was first demonstrated by CASA during 1985. This model featured vastly improved avionics and featured systems such as a head-up display , HOTAS -cockpit, AN/ALR-66 radar warning receiver , chaff and flare countermeasures , as well as

3850-903: 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

3960-641: The Imperial Japanese Navy Air Service was the carrier-based , single-engine Nakajima C6N Saiun ("Iridescent Cloud"). Codenamed "Myrt" by the Allies , the Nakajima C6N first flew in 1943 and was also highly elusive to American aircraft due to its excellent performance and speed of almost 400 mph. As fate would have it on 15 August 1945, a C6N1 was the last aircraft to be shot down in World War II . Japan also developed

4070-712: The Korean War , the United States begun to use RB-47 aircraft; these were at first were converted B-47 bombers, but later purposely built as RB-47 reconnaissance aircraft that had no bombing capability. Large cameras were mounted in the plane's belly and a truncated bomb bay was used for carrying photoflash bombs . Later versions of the RB-47, such as the RB-47H, were extensively modified for signals intelligence (ELINT), with additional equipment operator crew stations in

4180-707: The Royal Air Force (RAF) developed an electric heating system for the aerial camera; this innovation allowed reconnaissance aircraft to take pictures from very high altitudes without the camera parts freezing. In 1939, Sidney Cotton and Flying Officer Maurice Longbottom of the RAF suggested that airborne reconnaissance may be a task better suited to fast, small aircraft which would use their speed and high service ceiling to avoid detection and interception. Although this may perhaps seem obvious today with modern reconnaissance tasks performed by fast, high flying aircraft, at

4290-754: The Ryan Model 147 RPV (Remotely Piloted Vehicle) unmanned drone aircraft which were partly funded by the NRO during the 1960s. During the 1960s, the United States Navy opted to convert many of its supersonic carrier-based nuclear bomber, the North American A-5 Vigilante , into the capable RA-5C Vigilante reconnaissance aircraft. Beginning in the early 1980s, the U.S. Navy outfitted and deployed Grumman F-14 Tomcat aircraft in one squadron aboard an aircraft carrier with

4400-512: The U.S. 's high-altitude B-29 (which ended up not being deployed in Europe ). Approximately 50 Ju 388Ls were produced under rapidly deteriorating conditions at the end of the war. As with other high performance weapons introduced by Nazi Germany , too many circumstances in the war's logistics had changed by late 1944 for such aircraft to have any impact. The DFS 228 was a rocket -powered high-altitude reconnaissance aircraft under development in

4510-500: 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

CASA C-101 Aviojet - Misplaced Pages Continue

4620-495: The first flight took place on 27 June 1977, the test flight phase, which included vibration, flutter and spin tests, did not commence until 17 April 1978. The prototype was flown in the Farnborough International Airshow during late July 1978. Performance was reportedly found to be better than anticipated by the designers. An initial order for 88 aircraft was placed by the Spanish Air Force; built as

4730-664: 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,

4840-402: 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

4950-537: 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

5060-576: The 2010s, American defense conglomerate Lockheed Martin promoted its proposal to develop a hypersonic UAV , which it referred to the SR-72 in allusion to its function as a spiritual successor to the retired SR-71 Blackbird. The company has also developed several other reconnaissance UAVs, such as the Lockheed Martin RQ-170 Sentinel . Due to the low cost of miniature UAVs, this technology brings aerial reconnaissance into

5170-595: The B-29 was designated F-13 and carried a camera suite of three K-17B, two K-22 and one K-18 with provisions for others; it also retained the standard B-29 defensive armament of a dozen .50 caliber machine guns . In November 1944 an F-13 conducted the first flight by an Allied aircraft over Tokyo since the Doolittle Raid of April 1942. The Consolidated B-32 Dominator was also used for reconnaissance over Japan in August 1945. The Japanese Army Mitsubishi Ki-46 ,

5280-687: The British Mosquito and the American P-38 Lightning and P-51 Mustang . Such aircraft were painted in PRU Blue or Pink camouflage colours to make them difficult to spot in the air, and often were stripped of weapons or had engines modified for better performance at high altitudes (over 40,000 ft (12,000 m)). The American F-4, a factory modification of the Lockheed P-38 Lightning , replaced

5390-521: 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

5500-407: The C-101 during flight testing was reported in excess of predictions. On 17 March 1980, the first examples were introduced to operational service with the Spanish Air Force, which would be the principal customer for the C-101. The initial model possessed only a limited weapons capability, this attack capability was expanded upon later-built aircraft. Several models were exported to overseas operators;

5610-564: The C-101 has been adopted by the Chilean Air Force , Honduran Air Force and the Royal Jordanian Air Force . A final improved model, designated C-101DD , was demonstrated but did not find customers and thus it did not enter serial production. In addition to its use as a trainer aircraft, it has been used to perform aerobatics ; in the latter context, it has been flown by the Patrulla Aguila aerobatics team. As of 2019,

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5720-645: The C-101 is a low-mounted monoplane , with unswept wings. The cockpit , which was relatively spacious amongst its peers, accommodated a crew of two in a tandem seating; the seats were staggered to provide the instructor in the rear position with greater visibility. The fuselage provided considerable internal space, permitting the installation of various additional aviation or supplemental systems as to suit future requirements or other secondary roles. Foreseen secondary roles included ground attack, armed escort, photographic reconnaissance , and as an electronic countermeasures (ECM) platform. The only surprising feature of

5830-609: The C-101 remains in service in the Spanish Air Force and several other countries. Early on in the 2010s there were talks about the replacement of the C-101. Finally, in 2020 it was decided that the C-101 would be replaced by the Pilatus PC-21 (24) and the Airbus Future Jet Trainer (50 - 55). The C-101 was designed in response to a Spanish Air Force requirement issued in 1975, calling for

5940-571: The C-101. In addition to its own design team, technical assistance was provided by Germany 's Messerschmitt-Bölkow-Blohm (MBB) and the United States' Northrop . In June 1977, the first of four prototypes performed the type's maiden flight . The design was somewhat reminiscent of other jet trainers of the era, such as the BAE Hawk and the Alpha Jet , but was less aerodynamically sophisticated, being equipped with an un swept wing . Performance of

6050-769: The Julian calendar) over the Ottoman army. The pilot also dropped some hand-grenades over the Turkish Army barracks, although without success. This was the first day of the Balkan wars, and during the same day a similar mission was flown by German mercenaries in Ottoman service in the Thrace front against the Bulgarians. The Greek and the Ottoman mission flown during the same day are the first military aviation combat missions in

6160-534: 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

6270-400: 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

6380-426: The aircraft was the presence of a large internal weapons bay located beneath the rear cockpit; this allowed for a wider variety of armament to be carried than the underwing hard points could accommodate; alternatively, this bay enabled the carriage of other equipment, including reconnaissance payloads. In addition to the weapons bay, both armaments and stores could be fitted upon six underwing hard points. The design

6490-688: The aircraft's extreme performance characteristics in addition to risk of being captured as spies . The American U-2 shot down in Soviet airspace and capture of its pilot caused political turmoil at the height of the Cold War. Beginning in the early 1960s, United States aerial and satellite reconnaissance was coordinated by the National Reconnaissance Office (NRO). Risks such as loss or capture of reconnaissance aircraft crewmembers also contributed to U.S. development of

6600-628: The armed MQ-9 Reaper . By 2005, such UAVs could reportedly be equipped with compact cameras capable of identifying an object the size of a milk carton from altitudes of 60,000 feet. The U-2 has repeatedly been considered for retirement in favour of drones. In 2011, the USAF revealed plans to replace the U-2 with the RQ-4 Global Hawk , a UAV, within four years; however, in January 2012, it

6710-842: The bomb bay; unarmed weather reconnaissance WB-47s with cameras and meteorological instruments also served the United States Air Force (USAF) during the 1960s. The onset of the Cold War led to development of several highly specialized and clandestine strategic reconnaissance aircraft , or spy planes, such as the Lockheed U-2 and its successor the SR-71 Blackbird (both from the United States ). Flying these aircraft became an exceptionally demanding task, with crews specially selected and trained due to

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6820-637: The capability to carry the AGM-65 Maverick air-to-ground missile; however, as of 2000 it had not attracted any orders. Between 1990 and 1992, all Spanish Air Force C-101s received an extensive upgrade package which mainly focused on the aircraft's navigation and armament systems. Data from Jane's all the World's Aircraft 1989–90 General characteristics Performance Armament Aircraft of comparable role, configuration, and era Related lists Jet engine A jet engine

6930-488: The combustor). The above pressure and temperature are shown on a Thermodynamic cycle diagram. Aerial reconnaissance After the French Revolution , the new rulers became interested in using the balloon to observe enemy manoeuvres and appointed scientist Charles Coutelle to conduct studies using the balloon L'Entreprenant , the first military reconnaissance aircraft. The balloon found its first use in

7040-626: The conflict and, by spring 1945, became the dominant reconnaissance type flown by the USAAF in the European theatre . American photo-reconnaissance operations in Europe were centred at RAF Mount Farm , with the resulting photographs transferred to Medmenham for interpretation. Approximately 15,000 Fairchild K-20 aerial cameras were manufactured for use in Allied reconnaissance aircraft between 1941 and 1945. The British de Havilland Mosquito excelled in

7150-418: The design of the rear fuselage and tail section while Northrop's team were responsible for the design of the aircraft's wings and engine inlets. Out of these efforts, a relatively conventional design was developed; according to aviation author John C. Fredriksen, the principles of simplicity and economy were highly emphasised by the design, shunning high performance features. In terms of its basic configuration,

7260-647: The development of increasingly capable surveillance payloads, allowing miniature UAVs to provide high levels of capability in never before seen packages. Reconnaissance pods can be carried by fighter-bomber aircraft. Examples include the British Digital Joint Reconnaissance Pod (DJRP); Chinese KZ900 ; UK RAPTOR ; and the US Navy's F-14 Tomcat Tactical Airborne Reconnaissance Pod System (TARPS). Some aircraft made for non-military applications also have reconnaissance pods, i.e.

7370-496: 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

7480-405: 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

7590-425: 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

7700-650: 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

7810-530: The entire front twice a day and had taken over half a million photos since the beginning of the conflict. In January 1918, General Allenby used five Australian pilots from No. 1 Squadron AFC to photograph a 624-square-mile (1,620 km ) area in Palestine as an aid to correcting and improving maps of the Turkish front. This was a pioneering use of aerial photography as an aid for cartography . Lieutenants Leonard Taplin , Allan Runciman Brown , H. L. Fraser, Edward Patrick Kenny , and L. W. Rogers photographed

7920-545: The entire system of German trenches was being photographed. The first purpose-built and practical aerial camera was invented by Captain John Moore-Brabazon in 1915 with the help of the Thornton-Pickard company, greatly enhancing the efficiency of aerial photography. The camera was inserted into the floor of the aircraft and could be triggered by the pilot at intervals. Moore-Brabazon also pioneered

8030-504: The fastest non-jet Allied fighters of the time. The twin piston -engined Junkers Ju 388 high-altitude bomber was an ultimate evolution of the Ju 88 by way of the Ju 188 . The photographic reconnaissance Ju 388L variant had a pressurized cockpit from the Ju 388's original multi-role conception as not only a bomber but also a night fighter and bomber destroyer , due to RLM 's perceived threat of

8140-467: 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

8250-712: 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

8360-629: The hands of soldiers on the ground. The soldier on the ground can both control the UAV and see its output, yielding great benefit over a disconnected approach. With small systems being man packable, operators are now able to deploy air assets quickly and directly. The low cost and ease of operation of these miniature UAVs has enabled forces such as the Libyan Rebels to use miniature UAVs. Low cost miniature UAVs demand increasingly miniature imaging payloads. Developments in miniature electronics have fueled

8470-557: The high-altitude Tachikawa Ki-74 reconnaissance bomber, which was in a similar class of performance as the Mosquito , but only 16 were built and did not see operational service. The Luftwaffe began deploying jet aircraft in combat in 1944, and the twin- jet Arado Ar 234 Blitz ("Lightning") reconnaissance bomber was the world's first operational jet-powered bomber. The Ar 234B-1 was equipped with two Rb 50/30 or Rb 75/30 cameras, and its top speed of 460 mph allowed it to outrun

8580-451: The images, using Swiss stereoautograph machines made by Wild (Heerbrugg) and physical models made to facilitate understanding of what was there or what it was for. It is claimed that Medmanham's greatest operational success was Operation Crossbow which, from 23 December 1943, destroyed the V-1 infrastructure in northern France. According to R.V. Jones , photographs were used to establish

8690-583: The incorporation of stereoscopic techniques into aerial photography, allowing the height of objects on the landscape to be discerned by comparing photographs taken at different angles. In 1916, the Austro-Hungarian Empire made vertical camera axis aerial photos above Italy for map-making. By the end of the war, aerial cameras had dramatically increased in size and focal power and were used increasingly frequently as they proved their pivotal military worth; by 1918 both sides were photographing

8800-629: The last half of 1942 Lockheed would produce 96 F-5As, based on the P-38G with all later P-38 photo-reconnaissance variants designated F-5. In its reconnaissance role, the Lightning was so effective that over 1,200 F-4 and F-5 variants were delivered by Lockheed, and it was the United States Army Air Forces 's (USAAF) primary photo-reconnaissance type used throughout the war in all combat theatres. The Mustang F-6 arrived later in

8910-458: 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

9020-531: The latter part of World War II . It was designed by Felix Kracht at the Deutsche Forschungsanstalt für Segelflug (German Institute for Sailplane Flight) and in concept is an interesting precursor to the post-war American U-2 , being essentially a powered long- wingspan glider intended solely for the high-altitude aerial reconnaissance role. Advanced features of the DFS 228 design included

9130-394: 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}}}

9240-465: The nose-mounted four machine guns and cannon with four high-quality K-17 cameras. Approximately 120 F-4 and F-4As were hurriedly made available by March 1942, reaching the 8th Photographic Squadron in Australia by April (the first P-38s to see action). The F-4 had an early advantage of long range and high speed combined with ability to fly at high altitude ; a potent combination for reconnaissance. In

9350-404: 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

9460-547: The photo-reconnaissance role; the converted bomber was fitted with three cameras installed in what had been the bomb bay. It had a cruising speed of 255 mph, maximum speed of 362 mph and a maximum altitude of 35,000 feet. The first converted PRU (Photo-Reconnaissance Unit) Mosquito was delivered to RAF Benson in July 1941 by Geoffrey de Havilland himself. The PR Mk XVI and later variants had pressurized cockpits and also pressurized central and inner wing tanks to reduce fuel vaporization at high altitude . The Mosquito

9570-424: 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

9680-677: The size and the characteristic launching mechanisms for both the V-1 flying bomb and the V-2 rocket . Immediately after the Second World War, the long range aerial reconnaissance role was quickly taken up by adapted jet bombers , such as the English Electric Canberra and its American development the Martin B-57 , that were capable of flying higher or faster than enemy aircraft or defenses . Shortly after

9790-434: The start of the conflict, the usefulness of aerial photography was not fully appreciated, with reconnaissance being accomplished with map sketching from the air. Frederick Charles Victor Laws started experiments in aerial photography in 1912 with No. 1 Squadron RAF using the British dirigible Beta . He discovered that vertical photos taken with 60% overlap could be used to create a stereoscopic effect when viewed in

9900-539: 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

10010-581: The success of the work of Medmenham was the use of stereoscopic images, using a between plate overlap of exactly 60%. Despite initial scepticism about the possibility of German rocket development, stereoscopic analysis proved its existence and major operations, including the 1943 offensives against the V-2 rocket development plant at Peenemünde , were made possible by work carried out at Medmenham. Later offensives were also made against potential launch sites at Wizernes and 96 other launch sites in northern France. Particularly important sites were measured, from

10120-408: The technique of high-altitude, high-speed photography that was instrumental in revealing the locations of many crucial military and intelligence targets. Cotton also worked on ideas such as a prototype specialist reconnaissance aircraft and further refinements of photographic equipment. At its peak, British reconnaissance flights yielded 50,000 images per day to interpret. Of particular significance in

10230-502: The time it was radical thinking. Cotton and Longbottom proposed the use of Spitfires with their armament and radios removed and replaced with extra fuel and cameras. This concept led to the development of the Spitfire PR variants. With their armaments removed, these planes could attain a maximum speed of 396 mph while flying at an altitude of 30,000 feet, and were used for photo-reconnaissance missions. The Spitfire PR

10340-432: 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

10450-612: The unit's strength. A large number of photographic interpreters were recruited from the Hollywood Film Studios including Xavier Atencio . Two renowned archaeologists also worked there as interpreters: Dorothy Garrod , the first woman to hold an Oxbridge Chair, and Glyn Daniel , who went on to gain popular acclaim as the host of the television game show Animal, Vegetable or Mineral? . Sidney Cotton 's aerial photographs were far ahead of their time. Together with other members of his reconnaissance squadron, he pioneered

10560-540: The war. By VE-day , the print library, which documented and stored worldwide cover, held 5,000,000 prints from which 40,000 reports had been produced. American personnel had for some time formed an increasing part of the CIU and on 1 May 1944 this was finally recognised by changing the title of the unit to the Allied Central Interpretation Unit (ACIU). There were then over 1,700 personnel on

10670-517: The world's first air force . After the invention of photography, primitive aerial photographs were made of the ground from manned and unmanned balloons, starting in the 1860s, and from tethered kites from the 1880s onwards. An example was Arthur Batut 's kite-borne camera photographs of Labruguière starting from 1889. In the early 20th century, Julius Neubronner experimented with pigeon photography . These pigeons carried small cameras that incorporated timers. Ludwig Rahrmann in 1891 patented

10780-604: 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

10890-697: Was bought by numerous export customers, including Honduras , which bought four, and Chile , which bought four aircraft and parts for another eight to be assembled locally by ENAER . The Chilean BB-02s are designated T-36 Halcón . In 1983, CASA flew a dedicated attack version, the C-101CC-02 , which was again ordered by Chile. This time, only the prototype was built in Spain, with the remaining 22 machines built by ENAER. This variant featured yet another engine upgrade and increased fuel capacity; it has been designated A-36 Halcón ("Falcon"). Sixteen similar aircraft,

11000-406: 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

11110-781: Was by the Italian Air Force during the Italo-Turkish War of 1911–1912. On 23 October 1911, an Italian pilot, Capt. Carlo Piazza, flew over the Turkish lines in Libya to conduct an aerial reconnaissance mission; Another aviation first occurred on November 1 with the first ever dropping of an aerial bomb , performed by Sottotenente Giulio Gavotti , on Turkish troops from an early model of Etrich Taube aircraft. The first reconnaissance flight in Europe took place in Greece, over Thessaly, on 18 October 1912 (5 October by

11220-578: 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

11330-758: Was faster than most enemy fighters at 35,000 ft, and could roam almost anywhere. Colonel Roy M. Stanley II of United States Air Force (USAF) stated of the aircraft: "I consider the Mosquito the best photo-reconnaissance aircraft of the war". The United States Army Air Forces (USAAF) designation for the photo-reconnaissance Mosquito was F-8. Apart from (for example) the Mosquito, most World War II bombers were not as fast as fighters , although they were effective for aerial reconnaissance due to their long range, inherent stability in flight and capacity to carry large camera payloads. American bombers with top speeds of less than 300 mph used for reconnaissance include

11440-482: Was fitted with five cameras, which were heated to ensure good results (while the cockpit was not). In the reconnaissance role, the Spitfire proved to be extremely successful, resulting in numerous Spitfire variants being built specifically for that purpose. These served initially with what later became No. 1 Photographic Reconnaissance Unit (PRU). Other fighters were also adapted for photo-reconnaissance, including

11550-593: 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

11660-527: Was instead decided to extend the U-2's service life. Critics have pointed out that the RQ-4's cameras and sensors are less capable and lack all-weather operating capability; however, some of the U-2's sensors could be installed on the RQ-4. In late 2014, Lockheed Martin proposed converting the manned U-2 fleet into UAVs, which would substantially bolster its payload capability; however, the USAF declined to provide funding for such an extensive conversion. During

11770-682: Was later amalgamated with the Bomber Command Damage Assessment Section and the Night Photographic Interpretation Section of No 3 Photographic Reconnaissance Unit, RAF Oakington , in 1942. During 1942 and 1943, the CIU gradually expanded and was involved in the planning stages of practically every operation of the war, and in every aspect of intelligence. In 1945, daily intake of material averaged 25,000 negatives and 60,000 prints. Thirty-six million prints were made during

11880-592: Was produced in a modular fashion, which eases both manufacture and maintenance activities. It was provisioned with a considerable endurance range as a result of the initial requirement having called for a self-deployment capability to the Canary Islands from the Spanish mainland. The powerplant selected for the aircraft was the Honeywell TFE731-5-1J turbofan engine. This unit was actually

11990-427: 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

12100-409: 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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