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Python engine installed in altitude wind tunnel, Cleveland, Ohio, USA, August 25, 1949. An engine mechanic checks instrumentation prior to an investigation of engine operating characteristics and thrust control of a large turboprop engine with counter-rotating propellers under high-altitude flight conditions in the 20-foot-diameter test section of the Altitude Wind Tunnel at the Lewis Flight Propulsion Laboratory of the National Advisory Committee for Aeronautics (NACA), (renamed the John H. Glenn Research Center at Lewis Field). Python engine installed in altitude wind tunnel, Cleveland, Ohio, USA, August 25, 1949. Creator: Unknown. (KEYSTONE/HERITAGE IMAGES/HERITAGE SPACE)