Vought-Sikorsky 300

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The Vought-Sikorsky 300 was a helicopter designed by Igor Sikorsky. It first flew on 14th September 1939 and was a single three-blade rotor powered by a 75 horsepower (56 kW) engine. Its first free (untethered) flight was on 13th May, 1940. While not the first successful helicopter to fly, it was the first of the configuration that would later become the most popular.

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