O.S. ENGINES: FL-70 4-STROKE

Model Airplane News, Nov 2004

Want the power and realistic sound of a 4-stroke engine but think they're too expensive? Think again! The new FL-70 costs just $220! In addition to the high-quality components and construction for which O.S. engines are known, the FL-70 features a sealed front bearing to prevent oil from leaking and a newly designed 6OW air-bleed carburetor that's easy to adjust. The FL-70 is also the first engine from O.S. to incorporate a ringless piston/liner assembly (this reduces the need for maintenance). It comes with a light, compact F-4030 muffler and an "F" glow plug. The engineers at O.S. have also come up with the Aeropressure system, which uses the pressure from the muffler to prevent fuel from retreating back into the fuel tank. This helps to maintain a consistent fuel delivery regardless of the plane's attitude. Specs: displacement-0.699ci; bore-1.09 in.; stroke-0.748 in.; practical rpm-2,300 to 12,000; weight-6.5 oz.

O.S. Engines; distributed by Great Planes Model Distributors (217) 398-6300; (800) 682-8948; osengines.com.