Hughes 300

The Schweizer S300 series (formerly Hughes 300, Schweizer 300, and Sikorsky S-300) family of light utility helicopters was originally produced by Hughes Helicopters, as a development of the Hughes 269. Later manufactured by Schweizer Aircraft, and currently produced by Schweizer RSG, the basic design has been in production for over 50 years. The single, three-bladed main rotor and piston-powered S300 is mostly used as a cost-effective platform for training and agriculture.

This military version of the Model 269A, known as the TH-55 Osage was selected by the US Army in 1964 to become its standard training helicopter, retained the Lycoming HIO-360-B1A installation of the civil version but was fitted with military radio and instrumentation. An initial contract for 20 TH-55As was placed in 1964 and subsequent contracts under the Fiscal Year 1964 to 1967 budgets brought total Osage procurement to 792