How do I measure for shaft length? - SailNet Community
 
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post #1 of 4 Old 06-19-2008 Thread Starter
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How do I measure for shaft length?

As the final stage of re-powering we're replacing our shaft and prop. I need to tell the machine shop how long to make the new shaft, but I'm not positive how to make this measurement.

The boat has a full keel with a stern hung rudder. Where should the propeller sit in the aperture? Right in the middle? Closer to the boat or the rudder? Our existing prop isn't a great guide as it's the folding type with a casing bolted right to the hull.

Any advice appreciated!! Thanks.

Pacific Seacraft Mariah 31
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post #2 of 4 Old 06-19-2008
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Not that it's much help but the diagram attached would seem to indicate the prop has to go pretty much as far forward as possible also.Pacific Seacraft Corp. - Pacific Seacraft 31
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post #3 of 4 Old 06-19-2008
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On a powerboat inboard, if you have a 1" diameter shaft you should have about 3/4" between the prop hub and the skeg.

Wayne
Rehoboth Bay/Indian River, DE
S/Y KJ, Helms 25
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post #4 of 4 Old 06-20-2008
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Leave enough space for a zinc and call it good.
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