When we rebuild ZS-VNL (KR2 Retract tail dragger 2.0lt Turbo) the thrust bearing looked as if it had only done about 10 000km the motor had a prop strike on a duffed take off. Kenny Veringa did some testing on his proto type type IV 2.0lt Turbo he found the wear on the thrust bearing with a prop was minimal as in comparison to a motor vehicle. Another thing to remember is that when you drive your car the engine is constantly accelerating or de-accelerating and rev changes, thus the crank shaft has a lot more forces exerted in motor vehicle use versus aircraft use.
Norshel Control Instrumentation cc Norman Stapelberg Cell: 027 83 277 9725 Home: 027 11 818 1345 Fax: 027 11 818 3547 > The clutch only has the thrust applied when the clutch pedal is > depressed as when shifting gears for a few seconds. The propellar thrust is applied for hours at a time.< Not only that, but when was the last time you saw huge gyroscopic forces from the alternator and fan trying to bend and therefore fatigue the crank nose?
