Pratt & Whitney FT4

The Pratt & Whitney FT4 is an aero-derivative gas turbine developed from the J75 turbojet line. Development began in 1961 at the request of the United States Navy's Bureau of Ships for a lightweight, high-power engine for hydrofoils, and it first ran late in 1962. It went on to power the Hamilton-class cutters of the US Coast Guard, the Iroquois-class destroyers of the Royal Canadian Navy and, as a gas generator, the Peder Skram-class frigates of Denmark, in arrangements that kept diesel engines alongside it, as well as Polar-class icebreakers and the cruiseferry GTS Finnjet. Its rugged containerized design also suited electricity generation, and more than 1,000 units had been sold by mid-1976.