Reduction gear 2.8:1 for ZG 38 inline version
We make the reduction gear in two versions, side mounted and inline. The side mounted gearing has the drive shaft running alongside the carburettor and is for ring cowls, such as our Sopwith Pup and horizontally opposed twins. The inline version has the drive shaft over the crankcase, this is for models such as the Tiger Moth. The distance between the drive and crankshaft is 70?mm center to center. The length of the motor fitted with reduction gear is the same as the standard motor with our standard motor mount. A TITAN ZG 38SC with the 2,8:1 reduction gear weighs 2700 grams. Our reduction gearing uses two miniature Polyflex vee belts, these belts have been developed by the American company Gates and they are the best belts available.
The life of these Polyflex belts is unusually long, we have had in our Tiger Moth a 2,8:1 gear that has been flown regularly most weekends during the summer and it was six months before the belts needed replacing. We often hear from our customers who have been flying for several years with the original set of belts. Because we fit two belts it is highly unlikely that the belts fail simultaneously. When a belt fails one can carry on flying without noticing anything until the next start. With only one belt it is nigh impossible due to slippage to start the engine, but a pair of new belts are easy and quick to refit.
The Titan ZG 38SC with tuned pipe turns the 32x18" propeller 3,000 rpm, tick over is 500 rpm. With our stainless steel silencer #3877 you will get around 2700?rpm!