This manual describes the use, maintenance and precautions of the OS series engine
This document is the owner's instruction manual for the O.S. FL-70, an air-cooled, overhead-valve four-stroke engine designed specifically for trainer, sport, and scale model aircraft. The manual emphasizes strict adherence to safety warnings regarding propeller hazards, fuel toxicity, and carbon monoxide exhaust before attempting operation.
| Engine Type | Air-cooled, overhead-valve four stroke engine |
|---|---|
| Intended Use | Model aircraft (trainer, sport and scale models) |
| Fuel Requirement | Methanol based fuel containing 20% castor oil or synthetic lubricant plus 5-15% nitromethane |
| Included Glow Plug Type | Type F |
The engine requires methanol-based fuel containing at least 20% castor oil or a top quality synthetic lubricant, plus 5-15% nitromethane.
No, this engine was designed specifically for model aircraft and should not be used for any other purpose.
Users must never operate the engine in an enclosed space due to carbon monoxide exhaust and should avoid contact with rotating propellers.