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#3
05-17-2005, 12:56 PM
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Re: correct prop pitch??
I just went through this exercise on my 20' with a new yamaha (see yamaha 150 4-stroke prop). There is no substitute for trial and error. If you have a good relationship with your local dealer I would see if they will let you experiment.
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'86 20 ft CC with 4-stroke 150 yamaha 
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#4
05-19-2005, 10:14 PM
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Re: correct prop pitch??
Andrew, Just puy a 150 merc EFI on a 20 foot wellcraft V20 Center Console and used a 17 Mirage SS prop. Runs perfect. 44 mph at 5600 rpm. I agree a 17 pitch is about right Butch
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1985 seacraft SF18 with 97 merc 150 EFI 1988 shadow bass with 200 Johnson GT 74 searay 240V with modified 351 Ford/Mercruiser. One is not enough!
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#5
05-22-2005, 03:50 PM
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Re: correct prop pitch??
Go with the a 16" or 17".
I have a 20 Seafari,(heavier) and I run a custom 16.5" pitch 14" diameter 3 blade Powertech Prop (with this rake/blade design) on a reman'd 150 carb Merc that hydrodyno's at 187 hp at the propshaft. I turn slightly over 6000 rpms at WOT at 43 knots on the GPS, jacked and trimmed. I also have a Bob's nosecone installed. That alone added about 2-3 mph to my speed. (It came installed on my "new" lower unit after I used the old one to strike a floating log at 30 mph in the dark ) If you want a custom prop made just for your boat, PowerTech also enjoys making custom props, as long as you're not talking in excess of 27" pitch.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes. Fr. Frank says: Jesus liked fishing, too. He even walked on water to get to the boat! Currently without a SeaCraft  (2) Pompano 12' fishing kayaks '73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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