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Convair Model 48 Charger
The Convair Model 48 Charger was a prototype light attack and observation aircraft of the 1960s, developed to meet a requirement for a dedicated counter-insurgency (COIN) aircraft. It was a two-seat, twin-boom aircraft powered by two turboprop engines which lost out to the North American Rockwell OV-10 Bronco of similar layout, only a single example being built.
==Design and development==
In 1959, two United States Marine Corps officers developed the concept of a small low cost aircraft capable of providing close air support to the U.S. Marines, capable of operating from roads close to the battlefield, the concept being known as the Light Light Marine Attack Aircraft (L2VMA). As interest in such an aircraft grew, with interest from the US Army for a similar type, the Convair Division of General Dynamics started studies into counter-insurgency aircraft in 1961. In 1963, the various requirements were merged into a tri-service specification for a Light Armed Reconnaissance Aircraft (LARA), to be used not just by the U.S. Marines and Army, but also by the United States Air Force for counter-insurgency and forward air control roles, and to be available for export.〔Willis 2010, pp. 60–63.〕〔
The specification produced responses from nine manufacturers, including Convair, who submitted its Model 48 Charger in March 1964.〔 The Model 48 was a twin-boom monoplane, constructed mainly from aluminium, with fiberglass nose, rear fuselage and wingtips, with a retractable nosewheel undercarriage. It was powered by two Pratt & Whitney Canada PT-6 (military designation T-74), driving three bladed propellers. Its wings were of relatively short (27 ft 6 in/8.38 m) span, which meant that most of the wing was in the slipstream of the propellers, increasing the effectiveness of the full-span trailing-edge slotted flaps and leading edge slats inboard of the engines, which together acted to deflect the slipstream, giving a form of vectored thrust, in order to reduce takeoff and landing distances.〔''Flight International'' 14 January 1965, pp. 54–55.〕〔Ginter 1997, p.10.〕 The outer trailing-edge flaps doubled as ailerons, which were supplemented by spoilers at low speed. The aircraft was fitted with a large, all-moving tailplane which attached to the vertical fins located at the ends of the tailboom(s), with the tailplane having somewhat greater span (20 ft (6.1 m)) than the distance between the tailbooms.〔〔Ginter 1997, pp. 14–15.〕〔Willis 2010, p. 63.〕
Pilot and observer sat in tandem under a sliding canopy, while the rear fuselage held a cargo bay with a hinged tail cone capable of carrying 2,000 lb (910 kg) of cargo, which could include a complete PT-6 engine, or five paratroopers, in extremely cramped conditions, with a sixth paratrooper in the observer's seat. Four 7.62 mm machine guns were mounted in pods on the side of the fuselage, while 2,000 lb (910 kg) of external stores, including bombs, rockets and gun pods, could be carried on hardpoints under the wings and fuselage. To meet the specification's requirements for amphibious operations, it could be fitted with two large floats.〔〔Ginter 1997, pp. 30–32.〕〔Taylor 1965, pp. 231–232.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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