In 1863, the French writer Ponton D'Amecourt was the first person to coin the term "helicopter" from the two words "helico" for spiral and "pter" for wings.
Igor Sikorsky is acceptance to be the "father" of helicopters because he invented the first. He is called that because he invented the first successful helicopter, above which further designs were based. By 1940, Igor Sikorsky's successful VS-300 had become the model for all modern single-rotor helicopters. He also designed and built the first military helicopter, XR-4, which he delivered to Colonel Franklin Gregory of the U.S. Army.