The SciencesSikorsky's HelicopterAviation Editor, Scientific American. In charge, Daniel Guggenheim School of Aeronautics, New York UniversityBy Alexander Klemin on October 1, 1940AdvertisementABOUT THE AUTHOR(S)Recent Articles by Alexander KleminInstrumentation, Measurement, and ControlMust Flying be a "Racket"?Ideas in the Air