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 Specifications
The O.S. Engines Sirius 4-stroke engine is ready and waiting to give the vintage 7-cylinder design to any scale airplane modellers dream. The Golden Era_x009d_ 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.
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