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Old 11-26-2016, 02:43 AM
h_2_o h_2_o is offline
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Broke shaft, straightning shaft, keyways and props

So there is a youtube guy keith fenner anyway his latest set of videos he had a broken shaft. his latest set of videos he went over what caused the break, straightening of a new shaft, prop lapping, keyways and other interesting things. Yes it is on a much much larger scale than what we deal with but the principles are the same. It is a good watch and I think pertains to our boats that is why i didn't put this in the other youtube thread.

anyway I was curious if anyone hear laps their prop when fitting it to their shaft after watching the video it seems like a good idea. Along with making sure that your key is properly seated. Also does MC lap the coupling end or should that be done as well?

Part 1,2,3,4

Extra video that has some cool stuff in it as well
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Old 11-26-2016, 12:37 PM
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mikeg205 mikeg205 is offline
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I have seen some of these - I didn't lap the shaft because when I change my set home when I put it on... no play even before tightening.
...A bad day water skiing still beats a good day at work...1995 Pro Star 205....
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Old 11-26-2016, 08:09 PM
h_2_o h_2_o is offline
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isn't that the point of the lapping and the blue compound because it is tapered and it will feel like a correct fit but as you can see when he does it and even pbase has a good writeup about it http://www.pbase.com/mainecruising/fitting_a_prop that a prop can feel snug with only about 30% of it really fitting on the shaft.
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Old 11-26-2016, 08:25 PM
waterlogged882 waterlogged882 is offline
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I am sure there is some merit to lapping a prop/shaft to some degree or another but I don't see it for most applications. I say that relative to lapping a valve seat for the proper fit (100% seating surface) but that has implications of radiological concerns downstream of the valve. A prop is a little less critical. Not saying your point to this is any less important or less valid to the good of the cause.

If I get a prop back on over the key way or onto the spline and it runs back up the shaft to where it was when I took it off.... it's good for me...

The guy on pbase is well versed in his discipline of sea vessels and such.

Thanks for the links and information.

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