The Sikorsky R-4 is a two-seat helicopter designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine. The R-4 was the world's first large-scale mass-produced helicopter and the first helicopter used by the United States Army Air Forces, the United States Navy, the United States Coast Guard and the United Kingdom's Royal Air Force and Royal Navy. In U.S. Navy and U.S. Coast Guard service, the helicopter was known as the Sikorsky HNS-1. In British service it was known as the Hoverfly.
Specifications
General Characteristics
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- Wingspan 29.5ft (9.0m)
- Length 44.8ft (13.7m)
- Height 13.0ft (4.0m)
- Empty Weight 9,366lbs (4,248kg)
- Loaded Weight 13,835lbs (6,275kg)
Performance
- Power/Weight Ratio 10.046
- Wing Loading 244.8lbs/ft2 (1,195.4kg/m2)
- Wing Area 56.5ft2 (5.3m2)
- Drag Points 4834
Parts
- Number of Parts 83
- Control Surfaces 1
- Performance Cost 600
