While I do not want to discourage you from your project, I would like to suggest another possibility that you should consider. It would help to track the history of prop hub failures with wood and metal props. My suspicion is that the cracks start because of vibrations encountered with metal props that would have been damped out by a wood prop.
A related problem is the failure of Lycoming O-320 oil pump impellers. Does it make any sense that the best lubricated part in the engine should wear away until the keyway has eaten itself 75% of the way around the gear? My suspicion is that the gear is subject to high frequency oscillations because it sits at the opposite end of the crankshaft from the prop. As you collect information it would be useful to know how many tapered cranks there are out there and how many are attached to wood props. For the nervous out there reading this discussion, I would mention that you can out a new O-200 crankshaft in your engine for the cost of a replacement C-85 shaft, giving you a 10% power increase. Good luck, Bob Condon __________________________________________________________________________ ______ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] _________________________________________________________ Enlighten your in-box. http://www.topica.com/t/15
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