Igor Sikorsky's Helicopters
Igor Sikorsky (1889-1972)
Journal entry, 1930
Manuscript Division (136E.2)(
December 13, 2002
One of aviation's greatest designers, Russian-born Igor Sikorsky
began work on helicopters as early as 1910. In this journal, he
records his technical progress as of 1930. By 1940, 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.