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19 to 21 pitch guys

Old 08-31-2009, 05:04 PM
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Default 19 to 21 pitch guys

OK I have a 87 223ls alpha put a 19 3 blade on it and am having 5000 rpms when trimmimg out.. How many think a 21 will be perfect ans still be at high 50s
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Old 08-31-2009, 05:47 PM
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It sounds like the 19 is where ya want to be. The 21 will lower your rpm's too much, and reduce the acceleration .


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Old 08-31-2009, 06:17 PM
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Saw your post on another site also. You said you have a 454/330 with an alpha, so that's means your RPM range should be 4200-4600 at WOT. I would run a 21p 3 blade, or at least try one. It should bring your RPM down to 4600 where you should be and probably add a couple mph. A boat I had last year had a 350/alpha and came with a 19p, my WOT was 4900 rpm so I tried a 21p Mirage Plus, my rpm was 4300, so I tried a 21p Stiletto and brought my rpm back up to 4500, about 100 rpm short of where I should have been. I ran it the rest of the year and loved how it handled and had great bite. Oh, it also added about 6 mph over the 19p. Actually I still have the prop if you're interested, 14.25x21p Stiletto stainless with solid hub, I sold the boat with the 19p.

Last edited by 89Mach1; 08-31-2009 at 08:04 PM.
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Old 08-31-2009, 09:30 PM
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got the 21 Solas 14.5 dia. I will test this weekend and see what it does. Local prop guy said 21 should put me right were I want to be
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