EnvironmentEngines of the AirHighly Reliable Power-Plants have been Developed for Military Aircraft. These Will Have Direct Influence on Not Only the Future of Private and Commercial Flying, but on Engines for Automobiles. The Helicopter Poses Power-Plant Problems of its OwnBy Alexander Klemin on March 1, 1944AdvertisementABOUT THE AUTHOR(S)Recent Articles by Alexander KleminInstrumentation, Measurement, and ControlMust Flying be a "Racket"?Ideas in the Air