Cal 29 M25XP prop - SailNet Community

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  #1  
Old 12-16-2010
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Cal 29 M25XP prop

Hello all,

its me again. i have done some extensive searching here and have come up with a few different opinions and or views on prop sizing. so my question is.... do any of you Cal 29 owners have a M25XP and if so what size prop are you running and what kind of performance do you get out of it? im looking to replace my old pink one. My diver is thinking that the old one is 12" in diameter. I currently only make about 4.5 knots and am thinking i need a larger prop. I have read on one site that a 15X10 fits my engine although it might not fit my hull. I have also read that a martec 12X6 prop is correct also.

Thanks
Troy
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Last edited by helmanta; 12-16-2010 at 01:56 AM. Reason: better title
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Old 12-16-2010
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I dont know what you should have but you need to know what RPM the diesel is making to see if its a motor or prop issue as the performance is really bad 6 knots should be easy

When i rescued my Cal 29 out of NYC i moved it over 18 miles with a 4hp outboard and it made 4.5 knots
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Last edited by tommays; 12-16-2010 at 07:15 AM.
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Old 01-20-2011
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It all depends on what engine you have. Does it get up to RPM or not? If a diesel does it smoke? 12/6 is what they used with the atomic 4. Go to Moyer Marine website. He's done some research on Indigo and CDI props that are optimized for the A4. The manufacturer can tell you the best size and pitch. If you've got annother engine I'd go to the Michigan Wheel site and have them do the calculations. Alternatively the Propeller Handbook by Dave Gerr will take you the calculations. For my Beta 16 I came up with 8-9 in pitch. You can have a prop shop change the pitch a bit to optimize it. One thing is that ther's no room for a bigger blade than 12".
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