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Radioplane RP-77
The Radioplane RP-77 was a small target drone missile, constructed largely of plastic materials, produced by the Radioplane division of the Northrop Corporation. Although the RP-77D was successfully tested by the United States Army, the decision was made not to procure the aircraft.
==Design and development==
The development of the RP-77 began in 1955.〔Parsch 2004.〕 Similar in outline to Radioplane's earlier OQ-19, four prototypes of the RP-77 were constructed, two each of the RP-77, powered by a four-cylinder McCulloch piston engine, and of the RP-77A, powered by a six-cylinder Lycoming engine.〔 Results of flight-testing were insufficient to interest the U.S. Army, however in 1957 a proposal for an improved RP-77D, powered by a Boeing 502 turboprop, resulted in a contract for the construction of 20 aircraft.〔
The design of the RP-77D made extensive use of glass-polyester plastic materials.〔Merrill 1956, p.108.〕〔Duffin 1958, p.160.〕 The drone was launched using a rocket-assisted take-off system consisting of four Loki rockets, and was fitted with a radio control apparatus that, with the assistance of radar tracking, allowed the drone to be operated at a considerable distance from its launching point.〔 In addition to equipment typically carried by target drones, the RP-77D could be equipped with reconnaissance or meteorological sensors, or with air sampling equipment.〔 The RP-77D utilised the RPTA tracking system, developed by Radioplane, using audio frequency tones for control.〔Interavia p. 359〕 Tip tanks allowed for carriage of additional fuel to extend the aircraft's range, and recovery at the end of the flight was by parachute.〔''Journal of the Royal Aeronautical Society'', Volume LXIII, January–December 1959, (p.165 ).〕
An improved version of the RP-77D was projected, with provision for launching RP-76 target missiles.〔
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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