The world's first practical helicopter, the VS-300, took first flight at Stratford of Connecticut in the United States of America on 14th September 1939. The rotorcraft was designed by Igor Ivanovich Sikorsky, a Russian-American aviation pioneer and built by the Vought-Sikorsky Aircraft Division of the United Aircraft Corporation. Sikorsky piloted the helicopter for just a few seconds.
The VS-300 was the first to have a single main rotor and a tail-rotor design. It was of 28-foot diameter, three-blade rotor allowed for the variable pitch of the blades, with a blade speed of 250 mph to 300 mph. It is the standard basis of the rotor configuration for the helicopters manufactured today, across the world.
Sikorsky modified the design of VS-300 into the Sikorsky R-4, which was the world's first mass-produced helicopter in 1942. The VS-300,
today remains on the display at the Henry Ford Museum in Dearborn, Michigan of USA.