Ok if my prop shaft is sticking out further? - SailNet Community

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Old 04-05-2009
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Ok if my prop shaft is sticking out further?

A new 'feature' of the ZF-6 transmission, as a replacement for the Hurth HSB 50, is that it's 1" longer. This means that the prop shaft is 1" longer at the business end. On my setup, this means I go from about 4" to 5" of exposed shaft between the end of the cutlass bearing and the prop, itself.

I know alignment is required regardless, but should I go through the hassel of have the shaft shorted, rekeyed, etc?

Clearance is not an issue.
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Old 04-05-2009
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i cant see that as a real problem, but why did you not have it shortened ?
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Old 04-05-2009
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Cost and wasn't sure if I needed to shorten it.
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Old 04-05-2009
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The recommended

The recommended hang over distance between the cutlass bearing and the front edge of the prop hub is 1X the shaft diameter max. Beyond that and you can start to create shaft whip. 4" inches is way too much but 5" is really bad..

Per ABYC Standard P-06


6.5.5.4 The distance between the forward end of the
propeller hub and the aft end of the last strut bearing shall
be limited to one shaft diameter
.
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Old 04-05-2009
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my shaft is 1"...I don't think I could fit a zinc on the shaft if all I had to work with was 1".

Still, appreciate the reference and advice.
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Old 04-05-2009
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Quote:
Originally Posted by Pub911 View Post
my shaft is 1"...I don't think I could fit a zinc on the shaft if all I had to work with was 1".
What kind of boat are we talkin' about?
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Old 04-05-2009
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1972 NorthStar (aka Hughes) 38.

Fin keel skeg-hung rudder. 25hp diesel.
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Old 04-05-2009
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So the shaft exits the hull at the keel and is not supported by a strut?
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Old 04-05-2009
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correct. no strut. the length of the shaft overall is about 6' - in case that matters.
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Old 04-06-2009
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I wouldn't be comfortable with 5" of exposed shaft.
I'd get it shortened to 3" max.

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