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Авиация и Космонавтика 2007-11 / Е.Ружицкий - История вертолетных рекордов (1)
Вертолет двухвинтовой соосной схемы Э.Берлинера в полете
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Flight 1921-05 / Flight
THE BERLINER HELICOPTER: Last week we gave illustrations of the Petroczy-Karman helicopter, and here is shown two views of another direct-lift machine, invented by H. A. Berliner of Washington, U.S.A. The top photograph shows it in flight (on June 10 last), and below is a close-up view. The first successful flight of this machine, before the addition of the vertical stabilising fins and rudder, was made on November 11, 1919.
