Sikorsky R-4
Aircraft model
The Sikorsky R-4 is a two-seat helicopter that was designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine. Wikipedia
Manufacturer: Sikorsky Aircraft
Designer: Igor Sikorsky
Top speed: 75 mph
Engine type: Warner Scarab
Range: 130 mi
First flight: January 14, 1942
Introduction: 5 January 1943