Pratt & Whitney T73

The Pratt & Whitney T73, known by the company designation JFTD12, is a turboshaft engine based on the Pratt & Whitney JT12A. It powered the Sikorsky CH-54 Tarhe heavy-lift helicopter and its civil counterpart, the Sikorsky S-64 Skycrane flying crane. The basic military model, the T73-P-1, is rated at 4,500 horsepower for takeoff and 4,000 horsepower maximum continuous, and the higher-power T73-P-700 is rated at 4,800 horsepower for takeoff. The engine has a nine-stage axial compressor, eight combustor cans in an annular arrangement and a two-stage gas generator turbine followed by a two-stage free turbine, and it runs on aviation kerosene. Marine turboshaft versions are known as the FT12 and have been used in the Iroquois-class destroyer.