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Encyclopedia - Hughes 300C

The twin seat Hughes 300C was developed as the TH-55 Osage by the Hughes Helicopters in Culver City, USA in 1958 as a command and observation platform for the U.S. Army.

In 1964 the TH-55A was adopted as an ideal training helicopter. and by 1969 a total of 792 units were in operation.

By the lat 1960/'s there were a number of 300C's produced with a Curtiss-Wright RC2-60 Wankel Rotary engine in operation. The fuel hungry Wankel version of the 300C soon lead to the introduction of the 317 units being produced with an Allison 250-C18 turbine version. Kawasaki built 45 units for the Japanese army with a wider bench able to seat 3 persons and a 45% higher loading capacity.

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Hughes 300C


First Flight : October 1956
Country of Origin : USA
Operators : Brazil, Guyana, Italy, Japan, Nicaragua, Sierra Leone, US Army


Powerplant type : 180hp Lycoming HIO-360-A1A six cylinder boxer, Curtis-Wright RC2-60 Wankel rotary and Allison 250-C18 turbine
Number Of Rotors : 3


Height : 2.5 m
Main Rotor Diameter : 7.71 m


Empty Weight : 457 kg
Max Take-off Weight : 839 kg


Max Speed At Cruising Level : 121 km/h

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