Back Kaman K-240 / HTK-1 / TH-43E
1952

Kaman HTK-1

In 1950 at the same time as Kaman was working on the Marine Corps Observation Helicopter, the Company was awarded another contract by the Navy to produce a trainer helicopter. Designated the HTK-1, this was a refined version of the earlier K-225 and twenty-nine of these HTK-1s were built between 1951 and 1953. They served with the Navy at Pensacola until 1957. The HTK-1 was powered by a Lycoming O-435-4 piston engine developing 240hp.

P.Allen "The Helicopter", 1996

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Photo Gallery 

The first production HTK-1 for the Navy is flanked by a similar commercial machine. A large ventral/dorsal fin was later added to the center tail section.

Painted overall Orange-Yellow, this HTK-1 wears the markings of Helicopter Training Unit One (HTU-1). Kaman's trademark servo flaps are clearly visible on the rotors. A locally-fabricated skid has been added to the center tail fin.

An HTK U.S. Navy trainer seen in April 1951.

Personnel of HU-1 "Flying Angels" test a 6m nylon rescue ladder they devised for their HTK-1 during July 1958. The HTK-1 shared rescue duties at NAS Barbers Point with a hoist-equipped Sikorsky HO3S-1

The second production HTK-1 practices water landings during float gear evaluations.

The first Kaman drone helicopter, the HTK-1K nicknamed the "Yellow Peril", in its original configuration, is tethered for preliminary flight trials during Spring 1953.

The "Yellow Peril", after modifications, is put through its paces during the late 1950s.

During 1958, one of Kaman's drones was tested with an elctric motor in place of its piston engine. Current from a generator on the ground powered the motor.

An HTK U.S. Navy trainer seen in April 1951.

The HTK-1 Bureau Number 128657 was extensively modified to become the world's first twin-turbine helicopter. Here, the aircraft makes a sharp flare on landing during 1956.

The first twin turbine helicopter. In March 1954 the experimental HTK-2 was fitted with twin Boeing 502-2 engines.

Technical data for Kaman HTK-1

Engine: 1 x Lycoming O-435 pistone engine, rated at 180kW, rotor diameter: 12.2m, take-off weight: 1155kg, empty weight: 735kg, max speed: 130km/h, max speed: 130km/h, cruising speed: 101km/h, range: 212km

Comments 
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Cordell Bahn, e-mail, 19.09.2015

Yesterday I was looking at a Kaman HTK-1 at the Tillamook Aviation Museum in Oregon and noted that it had a six cylinder engine, not a four. Six is the number noted in other sources of information on the O-435. I'd appreciate anything that anyone might ad. Thank you.

shoes, e-mail, 17.06.2011

would like to fly a Kaman to get a feel for the handling of a twin rotor helicopter.

Roger Desjardins, e-mail, 02.12.2010

Very nice webpage. I wonder if Microsoft finally incorporated an early years Kaman into their Flightsimulator versions after 2004. Thats the version I fly at present. I spend all my spare time flying the Robinson R22 Beta II in simulation but I sure would like to fly a Kaman to get a feel for the handling of a twin rotor helicopter.

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