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 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.
  • Main internal parts such as the crankshaft cam holder and reduction gear are all plated to resist corrosion
  • V-shaped individual valve covers for vintage scale appearance
  • Impeller system distributes airfuel mixture equally to each cylinder ensuring high performance and smooth idle
  • Padded and lockable aluminum silver colored storage case
Displacement
0.6071cu in x 7 (9.95cc x 7)
Bore
0.944 (24.0mm)
Stroke
0.866 (22.0mm)
Practical RPM
1 500 - 7 000
Weight
111.7 oz (3 167g)
Crankshaft Size
UNF3/8-24
Distance from Backplate to Drive Washer
6.2 (158.5mm)
Outer Edge of Backplate to Pushrod Covers
4.8 (122mm)
Outer Diameter
9 (230mm)
Recommended Propellers
22x10-12, 23x8-12, 24x8-12, 26x8
SKU OSM37010

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