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Old 09-13-2018, 05:40 PM   #6
SoWhat
Senior Member
 
City: Boston
Country: US
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 367
" I think the shaft may experience a bit of "whip" at certain, low RPM settings."

Not sure I would redesign the drive train on an I think.
MacGyver a piece of angle iron alongside the shaft. Mount a dial indicator. Check TIR every 12". Then you know what has to be done.

You are probably at the extreme limit for unsupported shaft. Split Pillow Block is probably a good idea. Might also consider stiffer engine mounts.
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