Lycoming T55

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© Kenneth W Shanaberger 2000 - 2010

The Engine

Specifications

The T55 is a larger version of the T53, designed for U.S. Army helicopters. Design work began in 1954. Over 5 million hours have been flown by 3,600 T55 engines (as of 1998).

	Turboshaft
	Compressor: 7-stage axial, 1-stage centrifugal
	Turbine: 2-stage gas generator, 2-stage free
	Pressure ratio: 8.2

Models

Used by

T55-L-11A: 3,750 hp (2796 kW)

Boeing Vertol CH-47 Chinook

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page updated 26 April 2003