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.
Design and development[]
The K-125 was Charles Kaman's first helicopter, which utilized intermeshing rotors and Kaman's patented servo-flap stability control.[1] 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.[2] This aircraft is now at the Smithsonian Institution in Washington, D.C.
Variants[]
- K-125
- first prototype
- K-190
- improved prototype version of K-125 and licensed in April 1949
- K-225
- improved prototype version of K-125 (and K-190) and licensed in July 1949
- YH-22
- United States Aircraft designation for one K-225 bought evaluation.
- XHTK-1
- United States Navy designation for two K-225s bought for evaluation.
- XHTK-1G
- Designation for one K-225 evaluated by the United States Coast Guard
Specifications (K-225)[]
General characteristics
- 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)
Performance
- Maximum speed: 73 mph (117 km/h; 63 kn)
See also[]
References[]
,Notes
- ↑ "Hall of Fame/Inventor Profile: Charles Kaman"
- ↑ Boeing Model 502 Gas Turbine Engine
- ↑ Eckland, K.O. (2009-03-07). "American Airplane Ka-Ku". usa: Aerofiles.com. http://aerofiles.com/_k.html. Retrieved 8 May 2012.
- ↑ Kaman K-225, Smithsonian National Air and Space Museum, cit. 28. 1. 2013
- Bibliography
- "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.
External links[]
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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The original article can be found at Kaman K-225 and the edit history here.