In a message dated 00-04-17 15:30:48 EDT, you write: > I noticed the prop has a small amount of movement > forward and aft. If I grab hold of the blades and push and pull, you > can hear an audible thunk. The movement is quite small, perhaps 1/32 of > an inch. It's actually the hub that's moving. All the bolts to the > prop are tight. I can't imagine I'm actually moving the crank.
Believe it. As with all "sliding" bearings, there is a certain amount of clearance built in. In this case I think it's around 0.015". When you tug on the prop, the crank slides forward until the thrust bearing contacts the face of the crank. When the engine's running, there's oil under pressure in there and it keeps the surfaces from touching. Actually, the face of the crank is pulled forward toward the case by the prop, and that film of oil is pushing your plane through the air. So don't start trying to see how loud of a thunk you can make with it... John __________________________________________________________________________ ______ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] _________________________________________________________ Enlighten your in-box. http://www.topica.com/t/15
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