The Pratt & Whitney T73 (company designation JFTD12) is a turboshaft engine. Based on the JT12A, the T73 powered the Sikorsky CH-54 Tarhe and its civil counterpart Sikorsky S-64 Skycrane flying crane heavy-lift helicopters. Turboshaft versions for naval use are known as the FT12. Variants T73-P-1 Basic military model, rated at 4,500 horsepower (3,355 kW) takeoff power and 4,000 horsepower (2,982 kW) maximum continuous power T73-P-700 Higher-power military model with improved internal components; rated at 4,800 horsepower (3,579 kW) takeoff power and 4,430 horsepower (3,303 kW) maximum continuous power JFTD12A-3 JFTD12A-4A Civilian equivalent of T73-P-1 JFTD12A-5A Civilian equivalent of T73-P-700 FT12Marine powerplant Applications Sikorsky CH-54 Tarhe (T73) Sikorsky S-64 Skycrane/Erickson Air-Crane S-64 Skycrane (JTFD12) Specifications (T73-P-1) See also References Federal Aviation Administration Type Certificate Number E15EA, Revision 8 retrieved 14 February 2014 External links Atlantic Canadian Aviation: JT12 for Canadair aircraft T73 1950s turboshaft engines