O.S. Engine OSMG1300 FR5-300 5-Cylinder Radial Scale Engine  [OSMG1300]

Bring Period Sound and Looks with the O.S. Engine FR5-300

The O.S. Engine FR5-300, model number OSMG1300, provides convincing radial character for scale models while delivering consistent mechanical performance. Its five-cylinder profile enhances historical accuracy and engine note during flight.

Vintage Styling Supported by Precision Bearings

The unit reproduces classic radial geometry but relies on four ball bearings and two needle bearings to cut friction and extend operational life. Ringed pistons, pushrod overhead valves and a dedicated inlet manifold are engineered to deliver dependable running in typical flying conditions.

Performance Envelope and Practical Use

With a per-cylinder displacement of 0.607 cubic inches, the FR5-300 runs between 1,800 and 8,500 RPM and reaches around 4.0 hp at 8,000 RPM. The 94.3 ounce weight gives a usable power-to-mass balance suitable for a variety of scale tasks from display flying to spirited handling.

For modellers after authentic radial aesthetics combined with solid engineering, the O.S. Engine FR5-300 is a practical choice. It fits projects where presentation and dependable performance are both priorities.