In the spring of 1941 a prototype helicopter designed by Igor Sikorsky was performing well enough to warrant a contract being awarded to the Vought-Sikorsky division of United Aircraft for the development of a two-seat version, designated the XR-4. The first flight of the new helicopter was made in January 1942, and 130 production examples were soon produced. The R-4 recorded two firsts: it accomplished the first helicopter landing aboard a ship, and the first rescue by a helicopter. Twenty-five R-4s (under the designation HNS-1) were operated by the U.S. Navy and U.S. Coast Guard, and 52 R-4s were operated by the British (under the designation Hoverfly I).
information on this aircraft can be found at Wikipedia
(updated February 2009)
Sikorsky R-4 / HNS-1
Type: two-seat training and rescue helicopter Crew: 2 Armament: none Specifications: Length: 48' 2" (14.68 m) Height: 12' 5" (3.78 m) Empty Weight: 2020 lb (916 kg) Max Weight: 2535 lb (1150 kg) max at takeoff Propulsion: No. of Engines: 1 Powerplant: Warner R-550-1 radial Horsepower: 180 hp Performance: Range: 130 miles (209 km) Cruise Speed: N/A Max Speed: 75 mph ( 121 km/h) Ceiling: 8,000 ft (2440 m)
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