The document is a user manual for the O.S. FS81-P (also referred to as FS81-A in the title) single-cylinder overhead valve four-cycle engine equipped with a fuel pump system. It is designed specifically for model aircraft, offering broad power suitable for sport, scale, and aerobatic models.
| Engine Type | Single cylinder overhead valve four cycle engine |
|---|---|
| Fuel System | Fuel pump system |
| Carburetor Type | Type 61R integrated with regulator |
| Fuel Requirement | Methanol based fuel containing not less than 18% castor oil |
| Standard Silencer | F-5030 |
It should be operated on a methanol based fuel containing not less than 18% volumetric castor oil, or a top quality synthetic lubricant.
No, this engine is not supplied with any tools such as Allen keys or wrenches.
The recommended starting point is 13x7-9 or 14x6-7.