This document provides instructions for installing and operating the O.S. FS-70S four-stroke cycle engine. It details the assembly of the silencer and carburettor throttle, as well as specific installation requirements for mounting beams to absorb vibration.
The guide covers starting procedures using both electric starters and hand-starting methods (using a "chicken-stick"), including safety warnings regarding propeller balance and fuel systems. It also outlines running-in procedures for new engines.
| Displacement | 11.50 cc (0.702 cu.in.) |
|---|---|
| Bore | 25.8 mm (1.016 in.) |
| Stroke | 22.0 mm (0.866 in.) |
| Practical A.P.M. | 2,000 ~ 12,000 r.p.m. |
| Output | 1.1 BHP/11,000 r.p.m. |
| Weight | 70 g (20.1 oz.) |
An O.S. Type "F" glowplug is fitted and recommended.
A fuel containing 5 — 15% nitromethane is recommended.
Yes, it may be safely hand started except when using a lightweight wooden propeller.