Boeing test cell mechanic and test engineer follow performance of 330 horsepower YT50-B0-10 gas turbine engine during major endurance run. Engine is growth version of the Boeing T50 being produced as the power-plant for the USN QH-50C drone anti-submarine helicopter. The YT50 incorporates modified combustion system and new axial-centrifugal compressor. Other Boeing helicopter engines based on this design and developing more than 400 horsepower are being planned. Boeing photo. From Vertiflite (AHS Newsletter) Mar 1963.
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