This Day in Aviation History

May 13th, 1940
Sikorsky’s VS-300, the first helicopter with a tail rotor, makes its first free flight.

YouTube, Vought-Sikorsky VS-300 (1941):  http://bit.ly/1hKh0ke

Wikipedia, Vought-Sikorsky VS-300:  http://bit.ly/1jdAgMf

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