Geared Drive BW350 PSRU
Specifications
for 200-400 HP LS Engine Applications
Our PSRU products utilize our fully automatic, dry, centrifugal clutch which is the back bone of our system and the reason for our success. Our straight cut spur gear designs feature their own oil reservoir, oil pump and filtration system and built-in drive port for your hydraulic prop governor. All of our gearbox cases are CNC machined billet aluminum. These cases are lighter, stronger, and more beautiful than ever! Watch some of the machining process video sent to us by our machine shop.
The Centrifugal Clutch
The centrifugal clutch is the key to the success of this unit. The clutch operates due to the centrifugal force of the engines revolutions, so the pilot does no "shifting".
LS series V8 engines, having eight small light weight cylinders that do not produce the violent engine impluses as those of the typical six cylinder aircraft engine, offers the benefit of much milder engine impulses. These engine impluses are so much milder that the springs in the center of the clutch disc are sufficient to dampen harmonics. After all, the automotive industry has been using clutches to dampen harmonics between engines and transmissions for many years. Without a clutch in your transmission to dampen engine impulses between your engine and transmission, your car would hop and skip down the highway instead of rolling smoothly to your destination.
The higher the RPM's, the more firmly the clutch holds. The centrifugal weights are precisely balanced and designed to totally engage the propeller when the engine is running above idle. Disengagement happens only upon engine shut down and once the RPMs drop below approximately 800. As long as the aircraft is in flight the propeller will remain engaged. Because it will not free wheel in flight, you can use the propeller to slow the aircraft if you wish.
No more prop kick back upon start up or engine shut down!
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