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12" to 13" prop? |
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DougsdevilCC 
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Joined: September-19-2006 Location: Petersburg, MI Status: Offline Points: 43 |
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 Topic: 12" to 13" prop?Posted: July-09-2007 at 7:10pm |
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I have a 64 Am skier w/ small block Ford.
Can I replace a 12" prop w/ 13"? It appears that I would have clearance with bottom of boat, but does that make it to close? |
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CCcruiser
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TRBenj
Grand Poobah 
Joined: June-29-2005 Location: NWCT Status: Offline Points: 21135 |
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Posted: July-09-2007 at 7:42pm |
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I believe the general rule of thumb is to maintain clearance of at least 10% of the prop's diameter between the prop and the hull. That means you would need an inch or so of clearance.
I dont believe you can run a 13" prop on your hull without going to the longer shaft. |
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DougsdevilCC
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Joined: September-19-2006 Location: Petersburg, MI Status: Offline Points: 43 |
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Posted: July-10-2007 at 12:07am |
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makes good sense
thanks doug |
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CCcruiser
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stang72
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Joined: July-31-2004 Location: United States Status: Offline Points: 1608 |
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Posted: July-10-2007 at 3:48pm |
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Doug...I have a 13X13 on my 72 mustang...I switched from a 12X14....and yes the clearance will be the determining factor. In my case...I have more than an inch and it has not been a problem.
Performance really is pretty close...little better hole shot and bite in the turns. |
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stang72
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Joined: July-31-2004 Location: United States Status: Offline Points: 1608 |
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Posted: July-10-2007 at 4:13pm |
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Well I should say "my wifes mustang"... she now has claimed it hers!
A 12X14 and a 13X13 will turn approx. the same rpms. You can put a 13 on and measure...I use something (Like a piece of wood)that is an inch or larger and pass it through beween the hull and prop to determine clearance. As far as a longer shaft...I don't think my shaft is any longer now than it was a few years ago! Same one that has always been there...I guess.One things for sure... As soon as I put the thirteen incher to work , my wife did notice a difference in performance 
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