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Vought-Sikorsky VS-300

Aircraft model
The Vought-Sikorsky VS-300 is an American single-engine helicopter designed by Igor Sikorsky. It had a single three-blade rotor originally powered by a 75 horsepower engine. The first "free" flight of the VS-300 was on 13 May 1940. Wikipedia
Manufacturer: Sikorsky Aircraft
Designer: Igor Sikorsky
First flight: May 13, 1940
Engine types: Reciprocating engine and Franklin 4 series
Top speed: 50 mph
Developed into: Sikorsky R-4
Role: Experimental helicopter