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This is what.....

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KENO View Drop Down
Grand Poobah
Grand Poobah


Joined: June-06-2004
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: December-11-2020 at 3:55pm
Maybe your friends shaft is still together because they solved their problem in the last year or two and a lapping job did nothing to prevent breakage.

That many broken shafts on one boat must be a record, I think CC would have wanted that boat back to do a little root cause analysis.

Just think of all the money and resources expended over the years by a bunch of engineers at CC, Acme and various shaft suppliers and who knows who else................and all they had to do was listen to Pete and do a little lapping.

They should all be fired Wink

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8122pbrainard View Drop Down
Grand Poobah
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: December-12-2020 at 5:06am
Originally posted by Gary S Gary S wrote:

I'm not so sure of that Pete - I think that was a theory and it didn't work out. I think the keyway being broached too far up the shaft was what was found.. The old ones you could see the keyway when the prop was mounted,the new ones prop covered the keyway completely on the pictures I saw on PN. 

Yes, I understand the keyway position was determined to be a problem. My friends last shaft broke after the change was made. It was clear that the forward area of the prop/shaft taper wasn't seated. The material removed for keyways causes a weak spot and also stress in the area. It would be interesting to know if they ever considered not machining the keyway in the shaft at all? 


54 Atom


77 Tique

64 X55 Dunphy

Keep it original, Pete
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