This manual provides instructions on how to safely operate O.S. engines, as well as information on the engine's construction and components.
This document provides comprehensive operating instructions for the O.S. FL-70, an air-cooled overhead-valve four-stroke engine designed for trainer, sport, and scale model aircraft. It emphasizes strict adherence to safety warnings regarding fuel toxicity, carbon monoxide exhaust, and propeller hazards.
| Engine Type | Air-cooled, overhead-valve four stroke engine |
|---|---|
| Intended Use | Model aircraft (trainer, sport and scale) |
| Fuel Requirement | Methanol based fuel containing not less than 20% castor oil or synthetic lubricant plus 5-15% nitromethane |
| Carburetor Type | O.S. 60W airbleed carburetor |
The engine requires methanol based fuel containing at least 20% castor oil or a top quality synthetic lubricant, plus 5-15% nitromethane.
No, the engine is not supplied with any tools such as Allen keys or wrenches.
Never touch or allow objects to contact the rotating propeller, and do not crouch over the engine when it is running.