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Old 09-21-2018, 02:51 PM   #21
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City: Princeton Jct
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Prop Shaft Support

The maximum recommended unsupported distance for a 1.75" shaft is approximately 72". Yes, you will have significant shaft whip if you have an unsupported length of 130". Since this is not underwater, I might suggest fabricating a shelf and installing an intermediate greasable bearing at the mid point.
Best Regards, Blair Bugher
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Old 09-27-2018, 03:02 PM   #22
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City: Victoria, BC
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Vessel Name: Waves of Grace
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Alright, thanks everyone for the input. We have spent a bit of time running the boat at various speeds and observing the shaft. When running at lower speeds, we do occasionally (but not all the time) get a bit of whip in the shaft observable at the PSS shaft seal - the recommendation from my mechanic and the shaft supplier is to install a pillow block just ahead of the PSS. That will reduce the unsupported shaft length to within recommendations.

I'll post my progress but it won't be until December at the earliest!
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