This file is an instruction manual for OS O.S. 25SC-FP gasoline engine.
The document is a user guide for the O.S. FSQ-110, a single-cylinder overhead valve four-cycle engine designed specifically for model aircraft. It highlights features such as a new lubricating system that eliminates the need for breather tubing and an F-5040 silencer to minimize noise.
| Engine Type | Four Cycle Engine |
|---|---|
| Recommended Fuel Base | Methanol based fuel |
| Castor Oil Requirement | Not less than 18% |
| Nitromethane Percentage | 5-20% |
| Propeller Size (Sport & Aerobatic) | 13x9-11, 14x8-10 |
| Propeller Size (Scale) | 15x8, 16x8 |
The engine should be operated on a methanol based fuel containing not less than 18% castor oil or a top quality synthetic lubricant.
No, this engine was designed for model aircraft and should not be attempted to be used for any other purpose.
Since the FSQ-110 is intended to be started with an electric starter, the addition of a spinner assembly for centering the starter sleeve is desirable.