This manual provides instructions for the O.S. MAX-61SX-HRING and MAX-61RX-HRING helicopter engines. The MAX-61SX-HRING is a side-exhaust unit, while the MAX-61RX-HRING is a rear-exhaust version of the same engine. Both models feature a completely new design developed for high-performance F.A.I. F3C competition flyers and are equipped with a special O.S. Type 608 carburettor.
| Stroke | 22.0mm (0.866 in.) |
|---|---|
| Practical RPM | 2,000~18,000 r.p.m. |
| Weight | 500g (21.20 oz.) / 597g (21.10 oz.) |
The recommended O.S. plug is No.8.
A fuel containing 10% to 30% nitromethane is recommended for the best throttle response.
It is essential to use fuel containing at least 18% lubricant by volume for consistent performance and long engine life.