• Source: Kaman K-225

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.




Design and development


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 first gas turbine-powered helicopter in December 1951. This aircraft is now at the Smithsonian Institution in Washington, D.C.
A standard K-225 is preserved in the New England Air Museum at Windsor Locks Connecticut.
In 1953, the Turkish Army purchased one Kaman K-225 helicopter and a K-225 was the first helicopter flown in Turkey.




Variants



K-125
first two-seat prototype with 125 hp (93 kW) Lycoming O-390-3 engine and moulded plywood fuselage and bubble canopy.
K-190
improved prototype with 190 hp (140 kW) Lycoming engine, marketed as an open cockpit crop-duster, certified in April 1949
K-190A
open frame three-seat helicopter, powered by a 175 hp (130 kW) Lycoming O-435-C engine. Type certified on April 15, 1949.
K-190B
four-seat version.
K-225
improved model, powered by a 225 hp (168 kW) Lycoming O-435-A2 engine, certified on September 16, 1949.
K-5
designation for K-225 with Boeing T50-BO-2 model 502 engine.
YH-22
United States Air Force designation for one K-225 bought for evaluation.




Specifications (K-225)



Data from General characteristics
Crew: two
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



Related development

Kaman HH-43 Huskie
Aircraft of comparable role, configuration, and era

Flettner Fl 282




References






= Notes

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= Bibliography

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"Hall of Fame/Inventor Profile: Charles Kaman". National Inventors Hall of Fame. Archived from the original on 2009-01-06. Retrieved 2009-01-27.

Kata Kunci Pencarian:

• Kaman Aircraft
• Rotor Intermeshing
• Baja
• Bhanurekha Ganesan
• Daftar kerajaan yang pernah ada di Nusantara
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• Tumbuhan dan hewan terdomestikasi di Austronesia
• Pembangkit listrik tenaga air di Daerah Aliran Sungai Mekong
• Kaman K-225
• Charles Kaman
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• Turboshaft
• Intermeshing-rotor helicopter
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• Kaman Corporation
• Kaman HH-43 Huskie
• Turboprop
• New England Air Museum