|XHTK-1 modified with a Boeing 502 (YT50) turboshaft engine|
|First flight||15 January 1947|
|Primary user||United States Navy, United States Coast Guard|
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.
Design and development
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.
- first prototype
- improved prototype version of K-125 and licensed in April 1949
- improved prototype version of K-125 (and K-190) and licensed in July 1949
- United States Aircraft designation for one K-225 bought evaluation.
- United States Navy designation for two K-225s bought for evaluation.
- Designation for one K-225 evaluated by the United States Coast Guard
- Crew: 2
- Length: 22 ft 5 in (6.83 m)
- Height: 11 ft 0 in (3.35 m)
- Empty weight: 1,799 lb (816 kg)
- Gross weight: 2,703 lb (1,226 kg)
- Powerplant: 1 × Lycoming O-435-2 6-cyl. air-cooled horizontally opposed piston engine, 225 hp (168 kW)
- Main rotor diameter: 2× 38 ft 0 in (11.58 m)
- Maximum speed: 73 mph (117 km/h; 63 kn)
- "Hall of Fame/Inventor Profile: Charles Kaman". National Inventors Hall of Fame. http://www.invent.org/hall_of_fame/190.html. Retrieved 2009-01-27.
|Wikimedia Commons has media related to Kaman K-225.|
- Eckland, K.O. (2009-03-07). "American Airplane 1949 Popular Science article on Kaman K-190 and the blade intermesh technology developed by Kaman — ie rare photos Ka-Ku". usa: Aerofiles.com. http://aerofiles.com/_k.html. Retrieved 8 May 2012.
- "New 'Copter Almost Flies Itself"
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