The Kaman K-225 is an American experimental helicopter developed by Kaman Aircraft. One example was modified to become the world's first gas turbine-powered helicopter.
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 first gas turbine-powered helicopter in December 1951.[2] This aircraft is now at the Smithsonian Institution in Washington, D.C.
Federal Aviation Administration (September 26, 1950). "Helicopter Specification No. 1H1"(PDF). faa.gov. Archived(PDF) from the original on April 19, 2021. Retrieved September 2, 2022.
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