![]() It arrived at Wright Field, Ohio, on, having completed, in stages, the 1225km trip from Bridgeport, Connecticut, in 16 hr. ![]() Powered by a 165hp Warner R-500-3 engine, the prototype VS-316A flew for the first time on 13 January 1942 later, with the military designation XR-4 and serial number 41-18874, the aircraft was handed over to the USAAF for evaluation. A completely new feature was the fully-enclosed cabin, with side-by-side seating and dual controls for the 2-man crew. Like the VS-300, it had a framework of heavy-gauge steel tube, and all but the extreme rear end of the fuselage was fabric-covered, as were the 10.97m diameter main rotor blades. The Sikorsky R-4, or VS-316A, was a definitive development of Igor Sikorsky's successful pre-war VS-300, and in 1944 became the first helicopter in the world to be placed in series production. Sikorsky R-4 helicopter - development history, photos, technical data
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