Kaman K-125

K-225
XHTK-1 modified with a Boeing 502 (YT50) turboshaft engine
Role	Experimental helicopter
Manufacturer	Kaman Aircraft
First flight	15 January 1947
Status	Retired
Primary user	United States Navy, United States Coast Guard
Number built	7
Unit cost	$25,000

The Kaman K-225 was an experimental helicopter developed by Kaman Aircraft. One was modified to become the world's first gas turbine-powered helicopter.

The K-125 was Charles Kaman's first helicopter, which utilized intermeshing rotors and Kaman's patented servo-flap stability control. The K-125 first flew on 15 January 1947.

The K-190 and K-225 were an improved versions of the K-125, which first flew in April and July 1949 respectively. The U.S. Navy bought two and the Coast Guard one for $25,000 each. The United States Air Force evaluated one K-225 with the designation YH-22.

A modified K-225 equipped with a Boeing 502 (YT50) turboshaft engine became the world's first gas turbine- powered helicopter in December 1951. This aircraft is now at the Smithsonian Institution in Washington, D.C.

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