Misplaced Pages

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112-590: The original proposal from the United States Army Air Corps Air Technical Service Command in late 1943 was for a 400 mph (640 km/h) reconnaissance aircraft with a range of 4,000 nmi (7,400 km; 4,600 mi) and a ceiling of 40,000 ft (12,000 m). Its primary objective was high-speed overflights of the Japanese homeland and key enemy installations. During World War II , due to

224-617: A "fiasco" in the media, investigating boards in 1933–1934 recommended organizational and modernization changes that again set the Air Corps on the path to autonomy and eventual separation from the Army. A force of 2,320 aircraft was recommended by the Drum Board, and authorized by Congress in June 1936, but appropriations to build up the force were denied by the administration until 1939, when

336-615: A "team player". The open insurgency between 1920 and 1935 of airmen foreseeing a need for an independent air force in order to develop fully the potential of airpower had cost the careers of two of its near-legendary lights, Foulois and Mitchell, and nearly cost the reputation of two others, Pratt and Henry H. Arnold . In terms of the principle of civilian control of the military in peacetime, their tactics and behavior were clearly inappropriate. The political struggle had temporarily alienated supporters in Congress, had been counterproductive of

448-515: A 36-week course for junior and mid-career officers that included military aviation theory. The Bombardment Section, under the direction of its chief, Major Harold L. George , became influential in the development of doctrine and its dissemination throughout the Air Corps. Nine of its instructors became known throughout the Air Corps as the " Bomber Mafia ", eight of whom (including George) went on to be generals during World War II. Conversely, pursuit tacticians, primarily Capt. Claire Chennault , Chief of

560-794: A base. As their numbers and utility declined, they were replaced by a series of 50 twin-engine and single-engine small transports and used for staff duties. Pilot training was conducted between 1927 and 1937 in the Consolidated PT-3 trainer, followed by the Stearman PT-13 and variants after 1937. By 1933 the Air Corps expanded to a tactical strength of 50 squadrons: 21 pursuit, 13 observation, 12 bombardment, and 4 attack. All were understrength in aircraft and men, particularly officers, which resulted in most being commanded by junior officers (commonly first lieutenants) instead of by majors as authorized. The last open-cockpit fighter used by

672-569: A bright spot. The first action to repair the damaged image of the Air Corps involved the movement of ten YB-10s from Bolling Field to Alaska, ostensibly for an airfield survey, but timed to coincide with the release of the Baker Board's report in July. The successful development of the B-10 and subsequent orders for more than 150 (including its B-12 variant) continued the hegemony of the bomber within

784-513: A fraction of the cost of new aircraft. Thus, the RC-2 program was cancelled before any were built. Data from Jane's all the World's Aircraft 1947 General characteristics Performance Aircraft of comparable role, configuration, and era Related lists United States Army Air Corps The United States Army Air Corps ( USAAC ) was the aerial warfare service component of

896-659: A group of General Staff officers, recommended in 1923 that the Air Service be augmented by an offensive force of bombardment and pursuit units under the command of Army general headquarters in time of war, and many of its recommendations became Army regulations. The War Department desired to implement the Lassiter Board's recommendations, but the administration of President Calvin Coolidge chose instead to economize by radically cutting military budgets, particularly

1008-510: A lack of legally specified duties and responsibilities, the new position of Assistant Secretary of War for Air , held by F. Trubee Davison from July 1926 to March 1933, proved of little help in promoting autonomy for the air arm. The Air Corps Act gave authorization to carry out a five-year expansion program. However, a lack of appropriations caused the beginning of the program to be delayed until 1 July 1927. Patrick proposed an increase to 63 tactical squadrons (from an existing 32) to maintain

1120-580: A long-range capability for these new single-engined fighters was not undertaken until combat losses of bombers forced the issue. Notable fighters developed during the late 1930s and early 1940s were the Bell P-39 Airacobra (first flown April 1938), Curtiss P-40 Warhawk (October 1938), Lockheed P-38 Lightning (January 1939), North American P-51 Mustang (October 1940), and Republic P-47 Thunderbolt (May 1941). Technological development of fighters occurred so rapidly that by December 1941 both

1232-696: A modification of the Joint Action statement on coastal defense issued in 1926, was not endorsed by the Joint Army-Navy Board and never had authority other than a personal agreement between the two heads of service. Though the Navy repudiated the statement when Pratt retired in 1934, the Air Corps clung to the mission, and provided itself with the basis for development of long-range bombers and creating new doctrine to employ them. The formulation of theories of strategic bombing gave new impetus to

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1344-574: A plan that would have included the purchase of 144 four-engine bombers but approval was reversed in July when the moratorium against the long-range bomber program was imposed by the Joint Board. The purchase of 67 B-17s (five squadrons) in FY 1940 as an increment of the Woodring program, using carryover funds, was cancelled by Craig. The moratorium also resulted from the enmity of the Navy incurred by

1456-582: A profusion of pursuit, observation, and bomber aircraft during its 15-year history. The advent of the new generation of monoplanes and the emergence of strategic bombardment doctrine led to many designs in the mid and late 1930s that were still in use when the United States entered World War II . Among the key technology items developed were oxygen and cabin pressurization systems, engine superchargers (systems essential for high-altitude combat), advanced radio communication systems, such as VHF radios, and

1568-526: A range of 4,500 mi (7,200 km), exceeding design criteria. The XF-12 could photograph in both daylight and night and under conditions of reduced visibility at high altitudes over long ranges and with great speed. This "flying photo lab" was capable of mapping broad stretches of the globe. Only two prototypes were built each of the XF-11 and the XF-12 were ordered into service by the U.S. Army Air Forces, as

1680-516: A revision of the doctrinal guide for the Air Corps, training regulation TR 440-15 Employment of the Air Forces of the Army . A year earlier MacArthur had changed TR 440-15 to clarify "the Air Corps's place in the scheme of national defense and ... (to do away with) ... misconceptions and interbranch prejudices." The General Staff characterized its latest revision as a "compromise" with airpower advocates, to mitigate public criticism of

1792-434: A ruling that it could foresee no use for a long-range bomber in future conflict. As a direct result, the last planned order of long-range bombers (67 B-17s) was cancelled by Craig and a moratorium on further development of them was put into effect by restricting R&D funding to medium and light bombers. This policy would last less than a year, as it went against not only the trends of technological development, but against

1904-411: A safe altitude where excess fuel was burnt off, to lighten the aircraft and reduce the risk of fire. The pilot landed on the left main gear and the nose wheel and despite losing as much speed as possible before the other wing dropped, the aircraft suffered significant damage. The wing spar was cracked, and engines and props needed to be replaced but it was repaired by Republic, and returned to service. When

2016-542: A subordinate element of Army General Headquarters, which would be activated to control all Army units in case of war mobilization. In anticipation of military intervention in Cuba in 1933, the headquarters had been created on 1 October but not staffed. The Drum Board of 1933 had first endorsed the concept, but as a means of reintegrating the Air Corps into control by the General Staff, in effect reining it in. Among

2128-437: A thirteenth aircraft for stress testing, with deliveries made from January to August 1937. The cost of the aircraft disturbed Secretary of War Harry Woodring , who denied requests for further purchases, so that although the air arm embraced strategic bombing as its primary doctrine after the creation of GHQ Air Force, by 1938 there were still only thirteen strategic bombers on hand. On 18 March 1938 Secretary Woodring implemented

2240-460: Is an aerodynamic definition, the second a structural one. As an example of the distinction, during a tailslide , from an aerodynamic point of view, the trailing edge becomes the leading edge and vice versa but from a structural point of view the leading edge remains unchanged. The structural leading edge may be equipped with one or more of the following: Associated terms are leading edge radius and leading edge stagnation point . Seen in plan

2352-454: The 3rd Attack Wing in 1932, protecting the southern border , at which time the 1st became the 1st Pursuit Wing. The three wings became the foundation of General Headquarters Air Force upon its activation in 1935. The Air Corps adopted a new color scheme for painting its aircraft in 1927, heretofore painted olive drab . The wings and tails of aircraft were painted chrome yellow , with the words "U.S. ARMY" displayed in large black lettering on

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2464-607: The Curtiss P-1 Hawk (1926–1930) and Boeing P-12 (1929–1935) families, and before the 1934 introduction of the all-metal monoplane, most front-line bombers were canvas-and-wood variants of the radial engined Keystone LB-6 (60 LB-5A, LB-6 and LB-7 bombers) and B-3A (127 B-3A, B-4A, B-5, and B-6A bombers) designs. Between 1927 and 1934, the Curtiss O-1 Falcon was the most numerous of the 19 different types and series of observation craft and its A-3 variant

2576-630: The Materiel Division . Of the new law and organization, however, Wesley F. Craven and James L. Cate in the official history of the United States Army Air Forces concluded that: The bill which was finally enacted purported to be a compromise, but it leaned heavily on the Morrow recommendations. The Air Corps Act of 2 July 1926 effected no fundamental innovation. The change in designation meant no change in status:

2688-656: The Norden bombsight . As a further consequence of the Air Mail scandal, the Baker Board reviewed the performance of Air Corps aircraft and recognized that civilian aircraft were far superior to planes developed solely to Air Corps specifications. Following up on its recommendation, the Air Corps purchased and tested a Douglas DC-2 as the XC-32, which subsequently became the flying headquarters of Gen. Andrews. The DC-2 so exceeded Air Corps specifications that 17 were purchased under

2800-583: The RC-2 , which would be lengthened to 98 ft 9 in (30.10 m) with a fuselage plug ahead of the wing, and the Plexiglas nose replaced with a conventional nose. Pratt & Whitney R-4360-59s with only one General Electric turbosupercharger each would replace the R-4360-31s, providing more power at lower altitudes, and fuel capacity would be increased. The airliner would carry a crew of seven, and

2912-479: The United States Army between 1926 and 1941. After World War I , as early aviation became an increasingly important part of modern warfare, a philosophical rift developed between more traditional ground-based army personnel and those who felt that aircraft were being underutilized and that air operations were being stifled for political reasons unrelated to their effectiveness. The USAAC was renamed from

3024-481: The tables of organization . Administratively it organized the forces into four geographical districts (which later became the first four numbered air forces) that paralleled the four field army headquarters created in 1933. The General Staff perceived its creation as a means of lessening Air Corps autonomy, not increasing it, however, and GHQ Air Force was a "coordinate component" equal to the Air Corps, not subject to its control. The organizations reported separately to

3136-430: The " Prop and Wings " as its branch insignia through its disestablishment in 1947. Patrick became Chief of the Air Corps and Brig. Gen. James E. Fechet continued as his first assistant chief. On 17 July 1926, two lieutenant colonels were promoted to brigadier general for four-year terms as assistant chiefs of Air Corps: Frank P. Lahm , to command the new Air Corps Training Center , and William E. Gillmore, in command of

3248-550: The 29 November 1948 issue of Life magazine and the filmstrip exhibited at the 1948 U.S. Air Force Association Convention in New York. The XF-12 program had already been canceled when this flight was made. On 7 November 1948, the second prototype crashed while returning to Eglin Air Force Base from a photographic suitability test flight after the number 2 (port inner) engine exploded, causing violent buffeting. Five of

3360-665: The AAF came into being in June 1941. Three other long-range bombers began development during this period, though only mock-ups were produced before World War II: the B-29 (study begun in 1938), the Consolidated B-32 Dominator (June 1940), and the Convair B-36 Peacemaker (April 1941). In a special message to Congress on 12 January 1939, President Roosevelt advised that the threat of a new war made

3472-547: The Air Corps from control of its combat units caused problems of unity of command that became more acute as the Air Corps enlarged in preparation for World War II. This was resolved by the creation of the Army Air Forces (AAF), making both organizations subordinate to the new higher echelon. On 20 June 1941 , the Army Air Corps' existence as the primary air arm of the U.S. Army changed to that of solely being

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3584-457: The Air Corps had obtained a mission in coastal defense that justified both the creation of a centralized strike force and the development of four-engined bombers, and over the resistance of the General Staff lobbied for another mission, strategic bombardment, with which it could persuasively argue for independence from the Army. The cost of the General Staff's resistance in terms of preparedness had been severe, however. Its policies had resulted in

3696-470: The Air Corps increased in number, so did higher command echelons. The 2nd Wing , activated in 1922 as part of the Air Service, remained the only wing organization in the new Air Corps until 1929, when it was redesignated the 2nd Bombardment Wing in anticipation of the activation of the 1st Bombardment Wing , providing a bombardment wing on each coast. The 1st Bomb Wing was activated in 1931, followed by

3808-542: The Air Corps on 12 May 1938 when it widely publicized the interception of the Italian ocean liner Rex by three B-17s while it was 610 nautical miles (1,100 km) off-shore of New York City. Possibly under pressure from the Navy, Craig placed a limit of 100 nautical miles (190 km) on all future off-shore flights by the Army. The services together issued a revised Joint Action statement in November reasserting that

3920-626: The Air Corps that resulted in a feasibility study for a 35-ton 4-engined bomber (the Boeing XB-15 ). While it was later found to be unsuitable for combat because the power of existing engines was inadequate for its weight, the XB-15 led to the design of the smaller Model 299, later to become the Boeing B-17 Flying Fortress , whose first flight was at the end of July 1935. By that time the Air Corps had two projects in place for

4032-549: The Air Corps was still a combatant branch of the Army with less prestige than the Infantry. The position of the air arm within the Department of War remained essentially the same as before, that is, the flying units were under the operational control of the various ground forces corps area commands and not the Air Corps, which remained responsible for procurement and maintenance of aircraft, supply, and training. Because of

4144-533: The Air Corps, the Boeing P-26 Peashooter , came into service in 1933 and bridged the gap between the biplane and more modern fighters. The Air Corps was called upon in early 1934 to deliver mail in the wake of the Air Mail scandal , involving the postmaster general and heads of the airlines. Despite an embarrassing performance that resulted from numerous crashes and 13 fatalities and was deemed

4256-624: The Army , on 15 April 1940. In the fall of 1937, the Army War College 's course on the use of airpower reiterated the General Staff position and taught that airpower was of limited value when employed independently. Using attaché reports from both Spain and Ethiopia , and endorsed by a senior Air Corps instructor, Col. Byron Q. Jones , the course declared that the Flying Fortress concept had "died in Spain", and that airpower

4368-597: The Army's. The Lampert Committee of the House of Representatives in December 1925 proposed a unified air force independent of the Army and Navy, plus a department of defense to coordinate the three armed services. However another board, headed by Dwight Morrow , was appointed in September 1925 by Coolidge ostensibly to study the "best means of developing and applying aircraft in national defense" but in reality to minimize

4480-539: The B-17 while belatedly recognizing that coordinated air-ground support had been long neglected, decided that it would order only two-engined "light" bombers in fiscal years 1939 through 1941. It also rejected further advancement of Project A, the development program for a very long range bomber. In collaboration with the Navy, the Joint Board (whose senior member was Army Chief of Staff Gen. Malin Craig ) on 29 June 1938 issued

4592-481: The Chief of Staff, the Air Corps as the service element of the air arm, and GHQAF as the tactical element. However, all GHQ Air Force's members, along with members of units stationed overseas and under the control of local ground commanders, remained part of the Air Corps. This dual status and division of authority hampered the development of Air Corps for the next six years, as it had the Air Service during World War I, and

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4704-611: The General Staff. The War Plans Division of the Army reacted to the recommendations of the Baker Board by insisting that men and modern equipment for seven army divisions be procured before any increase in the Air Corps was begun, and opposed any immediate attempt to bring the Air Corps up to the 1,800 plane-strength first authorized in 1926, for fear of antagonizing the Navy. President Roosevelt approved an open-ended program to increase strength to 2,320 aircraft (albeit without any proviso for funding) in August 1934, and Secretary Dern approved

4816-789: The Joint Action Statement, but the newest revision parroted the anti-autonomy conclusions of the Drum and Baker Boards, and reasserted its long-held position (and that of the Secretary Dern) that auxiliary support of the ground forces was the primary mission of the Air Corps. TR 440-15 did acknowledge some doctrinal principles asserted by the ACTS (including the necessity of destroying an enemy's air forces and concentrating air forces against primary objectives) and recognized that future wars would probably entail some missions "beyond

4928-628: The Military Affairs Committee of the Congress rejected all bills set forth before it on both sides of the issue. They fashioned a compromise in which the findings of the Morrow Board were enacted as law, while providing the air arm a "five-year plan" for expansion and development. Maj. Gen. Mason Patrick , the Chief of Air Service, had proposed that it be made a semi-independent service within the War Department along

5040-581: The Morrow Board's recommendations, the act created an additional Assistant Secretary of War to "help foster military aeronautics", and established an air section in each division of the General Staff for a period of three years. Two additional brigadier generals would serve as assistant chiefs of the Air Corps. Previous provisions of the National Defense Act of 1920 that all flying units be commanded only by rated personnel and that flight pay be awarded were continued. The Air Corps also retained

5152-671: The P-39 and P-40 were approaching obsolescence, even though both had been in production less than 18 months. Bombers developed during this period were the Douglas A-20 Havoc (first flown October 1938), North American B-25 Mitchell (January 1939), Consolidated B-24 Liberator (December 1939), and Martin B-26 Marauder (November 1940). Except for the B-24, P-47, and P-51, all of these had production deliveries that began before

5264-613: The RC-2's purchase price was higher than they would accept. The RC-2 also would have had higher operating costs per passenger than more capacious airliners with similar fuel consumption such as the Lockheed Constellation and the Douglas DC-6 , and the end of the war created a glut of surplus military transports such as the Douglas C-54 Skymaster which could be readily converted into airliners for

5376-503: The U.S. Army Air Forces became the U.S. Air Force the XF-12 was later re-designated XR-12 . Operation Birds Eye was conceived to demonstrate the XF-12's capabilities. On 1 September 1948, the second prototype departed the U.S. Air Force Flight Test Center at Muroc, California , and climbed west to its 40,000 ft (12,000 m) cruising altitude over the Pacific before heading east. It then photographed its entire flight path across

5488-400: The United States on 390 individual 10 in (250 mm) photos each covering 490 mi (790 km), which were jointed to form a continuous 325 ft (99 m) print. They landed at Mitchel Field on Long Island , New York after six hours and 55 minutes at an average speed of 361 mph (581 km/h). A photo was taken approximately every 66 seconds. The flight was featured in

5600-589: The War Department, 14 four-engine planes were delivered to the air force up to the outbreak of World War II in September 1939." A major step toward creation of a separate air force occurred on 1 March 1935 with the activation of a centralized, air force-level command headed by an aviator answering directly to the Army Chief of Staff . Called the General Headquarters Air Force , the organization had existed in Army planning since 1924 as

5712-576: The XF-12 had three photographic compartments aft of the wing. One vertical, one split vertical, and one trimetrogon each using a 6 in (150 mm) Fairchild K-17 camera. For night reconnaissance, the XF-12 had a belly hold which accommodated 18 high-intensity photo-flash bombs to be ejected over the target. All bays were equipped with electrically operated, inward retracting doors designed for minimum drag and camera lenses were electrically heated to prevent frost build-up. The XF-12 also carried complete darkroom facilities to permit developing and printing

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5824-615: The acquisition of a dedicated high-performance photo reconnaissance aircraft to provide pre- and post-strike target analysis intelligence as well as photo interpretation to better allow commanders to make decisions for bombing raids. Republic Aviation submitted the XF-12 and it was competing against the Hughes XF-11 . Both were powered by the new P&W R-4360. The XF-12's first flight was made on 4 February 1946 and during flight testing, it reached an altitude of 45,000 ft (14,000 m) at 470 mph (760 km/h), and demonstrated

5936-440: The acquisition of obsolete aircraft as first-line equipment, stifled design development in the private sector of better types, retarded the development of radar and ordnance, and handicapped training, doctrine, and offensive organization by reneging on commitments to acquire the B-17. "From October 1935 until 30 June 1939, the Air Corps requested 206 B-17's and 11 B-15's. Yet because of cancellations and reductions of these requests by

6048-501: The activation of GHQ Air Force in December 1934. GHQ Air Force took control of all combat air units in the United States from the jurisdiction of corps area commanders, where it had resided since 1920, and organized them operationally into a strike force of three wings. The GHQ Air Force remained small in comparison to European air forces. On its first day of existence, the command consisted of 60 bombers, 42 attack aircraft, 146 pursuits, and 24 transports, amounting to 40% of strength in

6160-526: The air ahead of the wings can cause extreme heating of the leading edge. Heating was a major contributor to the destruction of the Space Shuttle Columbia during re-entry on February 1, 2003. When sailing into the wind, the dynamics that propel a sailboat forward are the same that create lift for an airplane. The term leading edge refers to the part of the sail that first contacts the wind. A fine tapered leading edge that does not disturb

6272-474: The air arm, and the principal component of the Army Air Forces," the overwhelming majority of personnel assigned to the AAF were members of the Air Corps. Public Law 69-446, 2 July 1926 The U.S. Army Air Service had a brief but turbulent history. Created during World War I by executive order of President Woodrow Wilson after America entered the war in April 1917 as the increasing use of airplanes and

6384-651: The argument for an independent air force. Strategic or long-range bombardment was intended to destroy an enemy's industry and war-making potential, and only an independent service would have a free hand to do so. But despite what it perceived as "obstruction" from the War Department, much of which was attributable to a shortage of funds, the Air Corps made great strides during the 1930s. A doctrine emerged that stressed precision bombing of industrial targets by heavily armed long-range aircraft. This doctrine resulted because of several factors. The Air Corps Tactical School moved in July 1931 to Maxwell Field , Alabama , where it taught

6496-403: The blame on him for the Air Corps' failures, he was investigated by a congressional subcommittee alleging corruption in aircraft procurement. The matter resulted in an impasse between committee chairman William N. Rogers and Secretary of War George Dern before being sent to the Army's Inspector General, who ruled largely in favor of Foulois. Rogers continued to severely criticize Foulois through

6608-466: The choice to two of the three assistant chiefs, Henry Conger Pratt and Oscar Westover . Pratt appeared to have the superior credentials, but he had been in charge of aircraft procurement during the Foulois years and was looked upon warily by Dern as possibly being another Mitchell or Foulois. Westover was chosen because he was the philosophical opposite of the two insurgent airmen in all respects, being

6720-670: The concept one step further in March 1930 by recommending that the types instead be light and heavy , the latter capable of long range carrying a heavy bomb load that could also be used during daylight. The Air Corps in January 1931 "got its foot in the door" for developing a mission for which only it would have capability, while at the same time creating a need for technological advancement of its equipment. Chief of Naval Operations Admiral William V. Pratt wanted approval of his proposition that all naval aviation including land-based aircraft

6832-400: The continuing movement within the Air Corps for independence, cooperated to resist it. On 11 September 1935, the Joint Board, at the behest of the Navy and with the concurrence of MacArthur, issued a new "Joint Action Statement" that once again asserted the limited role of the Air Corps as an auxiliary to the "mobile Army" in all its missions, including coastal defense. The edict was issued with

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6944-594: The designation C-33 to equip the first permanent transport unit, the 10th Transport Group, activated in June 1937 at Patterson Field in Ohio . In 1939 the Air Corps recognized that it might soon require large numbers of modern air transports for use in war and purchased 35 DC-2/ DC-3 hybrids, designated the C-39. After the fall of France, the Air Corps in September 1940 ordered 200 untried and unproven Curtiss C-46 Commandos from Curtiss-Wright and 545 Douglas C-47 Skytrains ,

7056-532: The development of longer-ranged bombers, Project A for a bomber with a ferry range of 5,000 miles (8,000 km), and Project D, for one of a range of up to 10,000 miles (16,000 km). In June 1936 the Air Corps requested 11 B-15s and 50 B-17s for reinforcing hemispheric defense forces in Hawaii, Alaska, and Panama. The request was rejected on the basis that there were no strategic requirements for aircraft of such capabilities. The Army and Navy, both cognizant of

7168-424: The development of the Air Corps in the short run, and had hardened the opposition of an already antagonistic General Staff. But through their mistakes and repeated rebuffs, the airmen had learned what they were lacking: proof for the argument that the Air Corps could perform a unique mission—strategic bombardment—and the real threat of another world war would soon reverse their fortunes. In March 1928, commenting on

7280-417: The earlier United States Army Air Service on 2 July 1926, and was part of the larger United States Army . The Air Corps became the United States Army Air Forces (USAAF) on 20 June 1941, giving it greater autonomy from the Army's middle-level command structure. During World War II , although not an administrative echelon, the Air Corps (AC) remained as one of the combat arms of the Army until 1947, when it

7392-459: The film while still airborne augmented by adjustable storage racks to handle any size of film container and additional photo equipment. This allowed immediate access to the intelligence after landing without the usual processing delay. Its wing had a straight taper with a high aspect ratio for maximum efficiency and squared tips. The engines used a sliding cowl to facilitate engine cooling instead of cowling flaps, which caused too much drag. There

7504-408: The first and second prototypes was the addition of cooling gills on the upper engine cowlings. The second prototype was fitted with the full reconnaissance equipment suite. The first prototype was damaged on 10 July 1947 while undergoing maximum landing weight tests when the right main gear was severed at the engine nacelle. After bouncing hard and staggering back into the air the test pilot climbed to

7616-445: The flow is desirable since 90% of the drag on a sailboat owing to sails is a result of vortex shedding from the edges of the sail. Sailboats utilize a mast to support the sail. To help reduce the drag and poor net sail performance, designers have experimented with masts that are more aerodynamically shaped, rotating masts, wing masts, or placed the mast behind the sails as in the mast aft rig . This aviation -related article

7728-673: The forerunner of the more than 10,000 C-47s and related variants that served in World War II. Even with the doctrine of strategic bombardment as its priority, the Air Corps belatedly sought to modernize its tactical combat force under GHQ Air Force, bringing into service the Northrop A-17 and Douglas B-18 Bolo in 1936, the Seversky P-35 in 1937, and the Curtiss P-36 in 1938. All of these aircraft were obsolete by

7840-425: The geopolitical realities of coming war. In August 1939 the Army's research and development program for 1941 was modified with the addition of nearly five million dollars to buy five long-range bombers for experimental purposes, resulting on 10 November 1939 in the request by Arnold of the developmental program that would create the Boeing B-29 Superfortress , which was approved on 2 December. Between 1930 and 1938

7952-419: The intent of again shoving an upstart Air Corps back into its place. However, the bomber advocates interpreted its language differently, concluding that the Air Corps could conduct long-range reconnaissance, attack approaching fleets, reinforce distant bases, and attack enemy air bases, all in furthering its mission to prevent an air attack on America. A month later (15 October 1935), the General Staff released

8064-539: The lack of survivability in combat of his unit's Keystone LB-7 and Martin NBS-1 bombers, Lt. Col. Hugh J. Knerr , commander of the 2nd Bombardment Group at Langley Field , Virginia , recommended that the Air Corps adopt two types of all-metal monoplane bombers, a short-range day bomber and a long-range night bomber. Instructors at the Air Corps Tactical School (ACTS), also then at Langley, took

8176-416: The lavishly appointed cabin for 46 passengers would feature pressurization to sea level with air conditioning, an electric galley providing hot meals, and an inflight lounge. The RC-2 would cruise above bad weather at 435 mph (700 km/h) at 40,000 feet (12,000 m). American Airlines and Pan Am made tentative orders, but without military F-12 orders to subsidize development and tooling costs,

8288-559: The leading edge may be straight or curved. A straight leading edge may be swept or unswept, the latter meaning that it is perpendicular to the longitudinal axis of the aircraft. As wing sweep is conventionally measured at the 25% chord line an unswept wing may have a swept or tapered leading edge. Some aircraft, like the General Dynamics F-111 , have swing-wings where the sweep of both wing and leading edge can be varied. In high-speed aircraft, compression heating of

8400-560: The lines of the Marine Corps within the Navy Department, but this was rejected; only the cosmetic name change was accepted. The legislation changed the name of the Air Service to the Air Corps, (in the words of one analyst) "thereby strengthening the conception of military aviation as an offensive, striking arm rather than an auxiliary service." The Air Corps Act (44 Stat. 780) became law on 2 July 1926. In accordance with

8512-450: The mantle of the radical airmen, and Westover soon found himself on "the wrong side of history" as far as the future of the Air Corps was concerned. Lines of authority were also blurred as GHQ Air Force controlled only combat flying units within the continental United States. The Air Corps was responsible for training, aircraft development, doctrine, and supply, while the ground forces corps area commanders still controlled installations and

8624-529: The military uses of aviation were readily apparent as the war continued to its climax, the U.S. Army Air Service gained permanent legislative authority in 1920 as a combatant arm of the line of the United States Army . There followed a six-year struggle between adherents of airpower and the supporters of the traditional military services about the value of an independent Air Force, intensified by struggles for funds caused by skimpy budgets, as much an impetus for independence as any other factor. The Lassiter Board,

8736-408: The mission of the Air Corps in coastal defense was only for supporting the Navy if called upon to do so, while simultaneously authorizing for the Navy the long-range shore-based coastal patrol mission denied the Air Corps. Westover, who stridently opposed cancellation of the Woodring program, was killed in an air crash on 21 September 1938 and was succeeded by Arnold. The Air Corps tested and employed

8848-538: The most numerous of the attack planes that fulfilled the observation/close support role designated by the General Staff as the primary mission of the Air Corps. Transport aircraft used during the first ten years of the Air Corps were of largely trimotor design, such as the Atlantic-Fokker C-2 and the Ford C-3 , and were procured in such small numbers (66 total) that they were doled out one airplane to

8960-410: The next decade: an all-metal low wing monoplane, closed cockpits, rotating gun turrets, retractable landing gear, internal bomb bay, high-lift devices and full engine cowlings. The B-10 proved to be so superior that as its 14 operational test models were delivered in 1934 they were fed into the Air Corps mail operation, and despite some glitches caused by pilot unfamiliarity with the innovations, were

9072-636: The opening chapter of the Air Corps manual be a doctrinal statement developed by the G-3 that "left little doubt" that the General Staff's intention was "to develop and employ aviation in support of ground forces." The Air Corps Board, on the orders of Arnold, developed a secret study for "defense of the Monroe Doctrine " that recommended development of long-range, high altitude, high-speed aircraft for bombardment and reconnaissance to accomplish that defense. The War Department, seeking to stifle procurement of

9184-429: The personnel manning them. An example of the difficulties this arrangement imposed on commanders was that while the commander of GHQ Air Force was responsible for the discipline of his command, he had no court martial authority over his personnel, which was retained by the corps area commander. Base commanders of Air Corps installations reported to as many as four different higher echelons. The issue of control of bases

9296-470: The political impact of the pending court-martial of Billy Mitchell (and to preempt the findings of the Lampert Committee). It declared that no threat of air attack was likely to exist to the United States, rejected the idea of a department of defense and a separate department of air, and recommended minor reforms that included renaming the air service to allow it "more prestige". In early 1926

9408-459: The primary defenses against interception. In both 1932 and 1933, large-scale maneuvers found fighters unable to climb to altitude quickly enough to intercept attacking B-9 and B-10 prototypes, a failure so complete that Westover, following the 1933 maneuvers, actually proposed elimination of pursuits altogether. 1933 was a pivotal year in the advancement of aviation technology in which the all-metal airplane came of age, "practically overnight" in

9520-471: The probability of war became apparent. Instead, the Air Corps inventory actually declined to 855 total aircraft in 1936, a year after the creation of GHQ Air Force, which by itself was recommended to have a strength of 980. The most serious fallout from the Air Mail fiasco was the retirement under fire of Major General Benjamin Foulois as Chief of Air Corps. Soon after the Roosevelt administration placed

9632-421: The program of the Lassiter Board already in effect, but Chief of Staff Gen. John Hines rejected the recommendation in favor of a plan drawn up by ground force Brig. Gen. Hugh Drum that proposed 52 squadrons. The act authorized expansion to 1,800 airplanes, 1,650 officers, and 15,000 enlisted men, to be reached in regular increments over a five-year period. None of the goals was reached by July 1932. Neither of

9744-570: The range requirements of operating in the Pacific, existing fighters and bombers were being used but were poorly suited to the USAAF's needs. The requirement existed for dedicated photo-reconnaissance aircraft with speed, range, and altitude capabilities beyond what was then available. In August 1943, U.S. President Franklin D. Roosevelt 's son, Colonel Elliot Roosevelt , commander of a Lockheed F-5 (a modified P-38 Lightning) "recon" unit, recommended

9856-500: The rear of the nacelle and for brief bursts of additional power, water-methanol injection . The XF-12 was originally intended to use contra-rotating propellers similar to those used on the XF-11, However, due to delivery delays and reliability issues, they were never installed. They would have been twinned three-bladed propellers (rotating in opposite directions). As it was, the aircraft used standard four-bladed Curtiss Electric propellers . The only visible external difference between

9968-525: The recommendations of the Baker Board , established in the wake of the Air Mail scandal, was that the proposals of the Drum Board be adopted: an increase in strength to 2,320 aircraft and establishment of GHQ Air Force as a permanent peacetime tactical organization, both to ameliorate the pressures for a separate air force and to exploit emerging capabilities in airpower. In the absence of a general headquarters (i.e. peacetime), GHQ Air Force would report to

10080-517: The recommendations of the Baker Board inadequate for American defense and requested approval of a "minimum 3,000-plane increase" for the Air Corps. On 3 April 1939, Congress allocated the $ 300 million requested by Roosevelt for expansion of the Air Corps, half of which was dedicated to purchasing planes to raise the inventory from 2,500 to 5,500 airplanes, and the other half for new personnel, training facilities, and bases. Orders for B-17s, which had been held in abeyance since June 1938, resumed in

10192-541: The relatively modest increases in airplanes or officers was accomplished until 1938 because adequate funds were never appropriated and the coming of the Great Depression forced reductions in pay and modernization across the board in the Army. Organizationally the Air Corps doubled from seven to fifteen groups , but the expansion was meaningless because all were seriously understrength in aircraft and pilots. ( Origin of first seven groups shown here ) As units of

10304-411: The requirement evaporated after World War II ended, while the cheaper off-the-shelf Boeing B-29 Superfortress and Boeing B-50 Superfortress could temporarily fill the role until the jet-powered Boeing RB-47 Stratojet entered service. The XF-12 was the fastest aircraft of its day to use four reciprocating engines, and the only one to exceed 450 mph (720 km/h) in level flight Minimizing drag

10416-405: The same time, the General Staff ordered studies from all the service branches to develop drafts for the coming field manuals. The Air Corps Board, a function of the ACTS, submitted a draft in September 1938 that included descriptions of independent air operations, strategic air attacks, and air action against naval forces, all of which the General Staff rejected in March 1939. Instead, it ordered that

10528-477: The school's Pursuit Section, found their influence waning because of repeated performance failures of pursuit aviation. Finally, the doctrine represented the Air Corps' attempt to develop autonomy from the General Staff, which enforced subordination of the air arm by limiting it to support of ground forces and defense of United States territory. New bomber types under development clearly outperformed new pursuit types, particularly in speed and altitude, then considered

10640-544: The seven crew escaped safely while two crew members were killed. The first prototype continued flight testing after being returned to service in 1948 but with no orders forthcoming and with the second prototype lost, flight testing was wound down and the remaining prototype was retired in June 1952, having flown just 117 hours from 1949 to 1952. It was later expended as a target at the Aberdeen Proving Ground , Maryland . Republic proposed an airliner version,

10752-523: The sphere of influence of the Ground Forces" (strategic bombardment), but it did not attach any importance to prioritization of targets, weakening its effectiveness as doctrine. The Air Corps in general assented to the changes, as it did to other compromises of the period, as acceptable for the moment. TR 440-15 remained the doctrinal position of the Air Corps until it was superseded by the first Air Corps Field Manual, FM 1–5 Employment of Aviation of

10864-444: The summer of 1935, threatening future Air Corps appropriations, and despite public support by Dern for the embattled chief, the administration was close to firing Foulois for his perceived attitude as a radical airman and his public criticisms of the administration during the controversy. He retired in December 1935 for the good of the service. The Roosevelt administration began a search for his replacement in September 1935, narrowing

10976-424: The summer of 1939 with incremental deliveries of 39 B-17Bs in 1939–40, 18 B-17Cs in 1940, and 42 B-17Ds in the first quarter of 1941. The first large order for heavy bomber production, 512 combat-capable B-17Es , was placed in July 1940. Leading edge The leading edge is the part of the wing that first contacts the air; alternatively it is the foremost edge of an airfoil section. The first

11088-556: The time they came into service, and the outbreak of war in Europe spurred development of more capable types. By October 1940, over a year before the United States was drawn into the war, every piston-driven single-seat fighter eventually used by the USAAF during World War II was in flight test except the P-47. However, the press of the enormous tasks confronting the Air Corps and the primacy of strategic bombing doctrine meant that development of

11200-513: The total wingspan and were extensively wind tunnel tested. After being used, the air was ducted toward the rear of the nacelle, to provide thrust. The entire engine nacelle was nearly as long as a Republic P-47 Thunderbolt . Research showed that a force roughly equivalent to 250 hp (190 kW) was generated by each engine exhaust during high speed cruise while at altitude. Each engine featured twin General Electric turbochargers at

11312-428: The training and logistics elements of the then-new United States Army Air Forces , which embraced the formerly-named General Headquarters Air Force under the new Air Force Combat Command organization for front-line combat operations; this new element, along with the Air Corps, comprised the USAAF. The Air Corps ceased to have an administrative structure after 9 March 1942, but as "the permanent statutory organization of

11424-427: The undersurface of the lower wings. Tail rudders were painted with a vertical dark blue band at the rudder hinge and 13 alternating red-and-white horizontal stripes trailing. The painting of fuselages olive drab was changed to blue in the early 1930s, and this motif continued until late 1937, when all new aircraft (now all-metal) were left unpainted except for national markings. Most pursuit fighters before 1935 were of

11536-482: The words of one historian, because of the availability of the first practical variable-pitch propeller . Coupled with "best weight" design of airframes, the controllable pitch propeller resulted in an immediate doubling of speeds and operating ranges without decreasing aircraft weights or increasing engine horsepower, exemplified by the civil Douglas DC-1 transport and the military Martin B-10 bomber. The B-10 featured innovations that became standard internationally for

11648-425: The years between the world wars , its primary purpose by Army policy remained support of ground forces rather than independent operations. On 1 March 1935, still struggling with the issue of a separate air arm, the Army activated the General Headquarters Air Force for centralized control of aviation combat units within the continental United States, separate from but coordinate with the Air Corps. The separation of

11760-433: Was a primary consideration throughout the design of the XF-12. Many features came from Republic's experience with fighter aircraft. Unusually, no compromises to the aerodynamics were made in the shape of its fuselage . Aviation Week was quoted as saying "the sharp nose and cylindrical cigar shape of the XF-12 fulfills a designer's dream of a no compromise design with aerodynamic considerations." For its reconnaissance role,

11872-460: Was also a two-stage impeller fan directly behind the propeller hub. These refinements allowed the engines to be tightly cowled for aerodynamic efficiency, while still keeping the engines adequately cooled. When the sliding cowl ring was closed during flight, the cooling air was ducted through the nacelle to the rear exhaust orifice increasing thrust, rather than adding drag as is usually the case. Air for engine intakes, oil coolers and intercoolers

11984-482: Was ameliorated in 1936 when GHQAF bases were exempted from corps area authority on recommendation of the Inspector General's Department, but in November 1940 it was restored again to Corps Area control when Army General Headquarters was activated. In January 1936, the Air Corps contracted with Boeing for thirteen Y1B-17 Flying Fortress prototypes, enough to equip one squadron for operational testing and

12096-500: Was by definition tied to carrier-based fleet operations. Pratt reached an agreement with new Army Chief of Staff Douglas MacArthur that the Air Corps would assume responsibility for coastal defense (traditionally a primary function of the Army but a secondary, wartime function of the Navy) beyond the range of the Army's Coast Artillery guns, ending the Navy's apparent duplication of effort in coastal air operations. The agreement, intended as

12208-408: Was drawn through the leading edge of each wing between the inboard and outboard engines. This reduced drag compared to using individual intakes for each component. In addition, because the air was taken from a high-pressure area at the front of the wing, this provided a ram air boost for increased power at high speeds, and more effective cooling of the oil and intercoolers. The intakes made up 25% of

12320-628: Was legally abolished by legislation establishing the Department of the Air Force . The Air Corps was renamed by the United States Congress largely as a compromise between the advocates of a separate air arm and those of the traditionalist Army high command who viewed the aviation arm as an auxiliary branch to support the ground forces. Although its members worked to promote the concept of air power and an autonomous air force in

12432-560: Was not overcome until the necessity of expanding the force occurred with the onset of World War II. The commanding general of GHQ Air Force, Maj. Gen. Frank M. Andrews , clashed philosophically with Westover over the direction in which the air arm was heading, adding to the difficulties, with Andrews in favor of autonomy and Westover not only espousing subordination to the Army chain of command but aggressively enforcing his prohibitions of any commentary opposed to current policy. Andrews, by virtue of being out from Westover's control, had picked up

12544-480: Was useful mainly as "long range artillery." Air Corps officers in the G-3 Department of the General Staff pointed out that Jones' conclusions were inconsistent with the revised TR 440-15, but their views were dismissed by Deputy Chief of Staff Maj. Gen. Stanley Embick with the comment: "No doctrine is sacrosanct, and of all military doctrines, that of the Air Corps should be the last to be so regarded." At

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