The Vought-Sikorsky VS-300 was a 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. While not the first successful helicopter to fly it was the first successful helicopter in the United States and the first successful helicopter to use a single vertical tail rotor configuration for antitorque.
Made by Sikorsky Aircraft.
Vought-Sikorsky VS-300 is the predecessor of the Sikorsky R-4.