What was the first viable American helicopter designed by Sikorsky?
Bell 47
Sikorsky R-4
Vought-Sikorsky VS-300
Sikorsky S-61
Answer
In 1939, Igor Sikorsky designed and flew the Vought-Sikorsky VS-300, the first viable American helicopter. This innovative aircraft pioneered the rotor configuration used by most helicopters today.
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