The O.S. TYPE 20C automatic carburettor, fitted to the O.S. MAX-32SX-H helicopter engine, incorporates an automatic mixture control device to ensure a correctly balanced fuel and air mixture at all throttle settings. It provides steady revolutions and a smooth response for reliable helicopter ascent and descent. The carburettor features two adjustable controls: the Needle Valve for maximum power at full throttle and the Mixture Control Valve for adjusting the mixture strength at part-throttle and idling speeds.
This manual provides instructions for the O.S. Type 20C automatic carburettor, which is fitted to the new O.S. MAX-32SX-H helicopter engine. The device incorporates an automatic mixture control system designed to ensure a correctly balanced fuel and air mixture at all throttle settings, providing steady revolutions and smooth response for reliable flight.
| Part Number | 23481400 |
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The initial adjustments are approximately correct when using a fuel containing 25% lubricant and 10—30% nitromethane.
The Needle Valve should be opened 1-1/2 turns from the fully closed position.
The throttle lever angle should not be more than 45° either side of the mid-point of its travel.