Igor Sikorsky On June 27, 1931, Sikorsky filed for a patent for another "direct lift aircraft", and was awarded patent No. 1,994,488 on March 19, 1935. His design plans eventually culminated in the first (tethered) flight of the Vought-Sikorsky VS-300 on September 14, 1939, with the first free flight occurring eight months later on May 24, 1940. Sikorsky's success with the VS-300 led to the R-4, which became the world's first mass-produced helicopter, in 1942. Sikorsky's final VS-300 rotor configuration, comprising a single main rotor and a single antitorque tail rotor, has proven to be one of the most popular helicopter configurations,
Igor Sikorsky Kyiv Polytechnic Institute September 2003. National Technical University of Ukraine “Kyiv Polytechnic Institute” positions in national and international ratings of the best Ukrainian educational institutions, employers ratings, etc. Igor Sikorsky Kyiv Polytechnic Institute The National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" (NTUU "KPI") is a major university in Kiev, Ukraine. In January 2012 Webometrics Ranking KPI made it into top 1,000 – taking 957th place out of 20,300 universities, 510th (February 2013). The institute was founded on 31 August 1898 as the Kiev Polytechnic Institute of Emperor Alexander II, but its current building complex was not built until 1902. Until