Igor Sikorsky test flying the VS-300 helicopter in 1940.
Previously:
Sikorsky S-72 compound helicopter - photos
Sikorsky S-64 Skycrane rotor and gearbox - photo
Sikorsky-Boeing SB-1 Defiant helicopter - GIF
Sikorsky H-2 coaxial rotor helicopter - photo
1922 helicopter prototype - GIF
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