Sikorsky Aircraft and it became a part of [[United Aircraft and Transport Corporation]] (now [[United Technologies Corporation]]) in July of that year. [[File:Sikorsky Aircraft Corporation ad Model S-42 Clipper Flying Boat 1937.jpg|thumb|left|upright|Advertisement for [[Sikorsky S-42]] Clipper flying boat from 1937]] In the United States, Igor Sikorsky originally concentrated on the development of multi-engined landplanes and then amphibious aircraft. In the late 1930s, sales declined and United Aircraft merged his division with [[Vought Aircraft]]. He then began work on developing a practical helicopter. After first flying the [[VS-300]] he developed the [[Sikorsky R-4]], the first stable, single-rotor, fully controllable [[helicopter]] to enter full-scale
Igor Sikorsky designed the first heavy bomber for Russia. In 2013, "Flying" magazine ranked Sikorsky number 12 on its list of the 51 Heroes of Aviation. On March 22, 2018 the Kiev city council officially renamed Kiev airport "International Airport "Kyiv" (Zhulyany) named after Igor Sikorsky". Sikorsky was a deeply religious Russian Orthodox Christian and authored two religious and philosophical books ("The Message of the Lord's Prayer" and "The Invisible Encounter"). Summarizing his beliefs, in the latter he wrote: Igor Sikorsky Igor Ivanovich Sikorsky (, "Ígor' Ivánovič Sikórskij"; May 25, 1889 – October 26, 1972), was a Russian-American aviation pioneer in both