short output shaft vs long outboard shaft?

[fast_boater]

I am going to call up a guy with a 50HP mercury, says runs good and is a short output shaft. Whats the difference between short and long shafts? I want to put this motor on our 14' North Craft. Thanks.

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[TheBoatman]

It's simply a matter of length of shaft. You need to make sure that the measurement from your bracket to where the prop is, is long enough to get the prop in the water to the correct depth.

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[the_wanderer]

The crux of the matter is the depth of your transom. The prop should be below the hull and be able to draw free water from ahead. If the prop is above the bottom of the hull, no matter if it is in water, it cannot draw sufficient water to push backwards to provide the forward thrust. So make sure your prop is below the hull in short.

Happy New Year and happy boating.

Alan.

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[BrendanS]

There's a cavitation plate above the prop. This should be almost directly inline with the bottom of the transom.

Have a look at the pictures <A target="_blank" HREF=http://www.smalloutboards.com/shaft.htm>click here</A> to make things clearer.

You need to work out where the outboard will be mounted and then do the measurement.

<hr width=100% size=1> I asked an economist for her phone number....and she gave me an estimate

 

[fast_boater]

ok thanks guys and thanks for the link. Great website.

Happy Holidays!


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