O.S. Engines Sirius 4-stroke engine

Jul 07, 2010 No Comments by



The O.S. Engines® Sirius 4-stroke engine is ready and waiting to give vintage 7-cylinder design to any scale airplane modeler’s dream.  The “Golden Era” looks of the FR7-420 Sirius are matched by its superb power output and rich, realistic sound.  The V-shaped valve layout makes this engine compatible with several airplane styles.  The main internal parts like the crankshaft, cam holder and reduction gear are all plated to resist corrosion while the air-fuel mix is distributed equally to each cylinder to ensure a stable, long-lasting idle.



Displacement: 0.6071 cu in ( 9.95 cc) per cylinder

Bore: 0.944 in (24.0 mm)

Stroke: 0.866 in (22.0 mm)

Practical RPM: 1,500-7,000

Weight: 111.7 oz (3.167 g)


OSMG1307    FR7-420 Sirius 4-Stroke Engine            Street:$3499.99


Available in late July


About the author

West Coast senior editor About me: I’ve been involved with RC aircraft since high school and have flown just about everything. I started my RC career with scratch-building, but now like many pilots I rely on ARFs to get me in the air. My main focus is on pylon racing, aerobats, combat and scale warbirds.
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