right propeller for 22ft SK - 1957

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right propeller for 22ft SK - 1957

Postby SteveNL » Sun Jul 23, 2017 2:12 am

Hi guys,

I have a 1957 22ft sea skiff which has at the moment a 13x12x1 propeller. Originally it must be a 11-1/2x12x1. Can somebody tell me the difference, gives the current one more torque or perhaps a higher topspeed?

perhaps someone cabn advise me?

regards,

steve
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Re: right propeller for 22ft SK - 1957

Postby island time » Sat Aug 05, 2017 7:31 am

Steve,
Correct prop sizing is a science, there are direct relationships between diameter and pitch for each application but a quick over simplification would be that diameter produces torque and pitch produces speed.
There are several places on line where you can give particulars about your boat and they will make recommendations for prop size.
I have an 18' SeaSkiff with a 95Hp "K" engine and that has a 13"DX12"P. which works well overall.

Craig
Craig Wilson
Churchville, NY
Alexandria Bay, NY

1968 23' Chris Craft lancer
1971 31' Revelcraft
1988 25' Fourwinns
1972 19' Chris Craft Lancer
1957 18' Chris Craft Sea Skiff
1958 18' Chris Craft Sea Skiff
1968 23' Chris Craft Commander
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Re: right propeller for 22ft SK - 1957

Postby drrot » Sat Aug 05, 2017 3:17 pm

Steve,
You didn't mention what engine you have. See http://www.finewoodboats.com/1966prop50050_wm.jpg for factory specs.
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Re: right propeller for 22ft SK - 1957

Postby SteveNL » Sun Aug 06, 2017 4:34 pm

Hi Jim,

It is a 95hp, 6 cylinder k-engine

Regards,

Steven
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Re: right propeller for 22ft SK - 1957

Postby drrot » Mon Aug 07, 2017 9:54 am

According to the list an 11 1/2X12 would be correct. Also check 12X12 as some that have been restored several times loose diameter.
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Re: right propeller for 22ft SK - 1957

Postby mbigpops » Mon Aug 07, 2017 7:12 pm

It sounds like you have the same problem that I had with my prop. Too large diameter which means extra torque for initial start up power at the expense of achieving high RPMs and top end speed.

Mark
1953 CC Rocket Runabout "Rocket Man"
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