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Effect of twinjet exhausts in simulation take-off, USA, July 7, 1949. Study of effect of twin-jet exhausts inclined toward the ground in simulation of take-off conditions for certain engine installations. Such an engine installation is useful for decreasing the takeoff distance of aircraft. This is one of many problems of operation that were under study in 1949 at the Lewis Flight Propulsion Laboratory, of the National Advisory Committee for Aeronautics, now known as John H. Glenn Research Center at Lewis Field, Cleveland, Ohio. Effect of twinjet exhausts in simulation take-off, USA, July 7, 1949. Creator: Unknown. (KEYSTONE/HERITAGE IMAGES/HERITAGE SPACE)