The T-56, a jet engine that uses a propeller to produce most of its thrust, was originally designed to power the Lockheed C-130 Hercules. Because the T-56 compressor and turbine rotate at a high speed (13,820 rpm), a reduction gearbox is used to allow the propeller to turn at a much slower, more efficient speed. The production T-56 engine delivers approximately 4,000 hp to the propeller, while an additional 800 pounds of thrust is produced by the jet exhaust. Its maximum operating altitude is 55,000 feet.
The T-56 evolved from Allison's T-38 engine and was first flown in the nose of a B-17 test-bed aircraft in 1954. The engine on display is a prototype of later engines in the T-56 series.
Gear reduction ratio:
12.5 to 1
Weight (without propeller):
Maximum operating altitude:
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