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Product Details
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O.S. FR5-300 Sirius
This incredible 50cc five cylinder radial engine closely follows full-size practice in its design and construction, including the use of a geared double-track cam ring to operate its valve gear.
The Sirius features pushrod driven overhead valves, four ball bearings & two needle bearings, ringed pistons, a special inlet manifold assembly to balance the mixture distribution to the inlet pipes from the carburettor and a special propeller locknut assembly as standard.
Supplied complete with a radial mount, the FR5-300 Sirius is ideal for large scale models and is designed to be used with 18" x 12~14" to 22" x 8" propellers.
See the engine accessories at the end of this section for the optional front or rear exhaust collector rings specifically designed for this engine.
Specification
Propeller Range: 18x12 18x14 20x8 20x10 22x8
Weight: 2670g
Displacement: 9.95cc x5
Bore: 24.0mm
Stroke: 22.0mm
Power Output: TBA
Practical RPM: 1800-8500
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