Research Results For 'Sikorsky R-4B'

SIKORSKY R-4B

The Sikorsky R-4B (Hoverfly I) was an American built two-seat training helicopter of the Second World War. The British version was known as the Hoverfly I and the U.S. Navy version the HNS-1. The Sikorsky R-4B had a three-blade main rotor powered by a Warner R-550-1 7-cylinder radial fan-cooled engine providing a top speed of 120 kmh.
Research Sikorsky R-4B

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