16 December 1951: The first helicopter powered by a gas turbine - TopicsExpress

16 December 1951: The first helicopter powered by a gas turbine engine made its first flight at the Kaman Aircraft Company plant at Bloomfield, Connecticut. Using a K-225 tandem rotor helicopter delivered to the U.S. Navy in 1949, Bureau of Aeronautics serial number (“Bu. No.”) 125477, Kaman replaced the 220 horsepower Lycoming O-435-A2 reciprocating engine with a Boeing 502-2 gas turbine. This engine could produce 175 continuous horsepower, less than the piston engine, but it also weighed considerably less.

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