General Electric T58
de Havilland Gnome
In 1953 the U.S. Navy asked for a
helicopter turboshaft to weigh 400 lbs and deliver 800 hp. GE's prototype
T58 first ran in 1955 weighing 250 lbs and delivered 1,050 hp. Two T58s
powered the first jet helicopter in the U.S., a modified HSS-1, in 1957.
In 1959, the civil CT58 was the first jet helicopter engine certified by