The book is dedicated to Igor Ivanovich Sikorsky, the great aircraft designer of the 20th century, whose name is associated with the formation of Russian aviation and the creation of the world's first multi-engine aircraft "Russian Vityaz" and "Ilya Muromets." It pays great attention to the Russian period of Sikorsky's activity, his contribution to the formation and development of all branches of aviation in Russia, ahead of the leading foreign countries in a number of areas, and also considers the main stages of his life and work in America, the contribution of the designer to the creation of the first transcontinental airliners and world helicopter construction.