Twin 7 cylinder Os Sirius Radial engines. Video by Gas rc plane

Twin 7 cylinder Os Sirius Radial engines.

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Tags Radial, engine, OS, Engines, boston, Havoc, a20g, a-20-g, a-20g, radio, control, rc, aircraft, plane, airplane, aeroplane, model, modelengines, modelenginesaus, 37010, aviation, Aus