28 skater slip number
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28 skater slip number
Hi all what should I do with my boat, my props are 15x32 4b and I am getting only 84 @ 6000 . My slip numbers are 17% my engines 250xs gear ratio 1.75 any advice .
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Your number is very high. Who's props are you running? I have seen slip numbers around 8 percent or less. 32's for 250's might be a little big also depending on set up and conditions. Eng height also a factor? Do you have jack plates? I have tried lots of props and found Dewalds work best. They were 3mph faster using a 4 blade versus the same pitch mercury racing 3 blade. I can give his number if you like?
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ho again the motors bolted to a 6" TH manual jack. when i was running my other 3Blads prop which was 15X31 i was getting 90-91 mph my slip around 10%. at the same hight. i switched to those 4Blads prop bigger size 15X32 and i am getting 17% slip and speed went down to 84 MPH at the same 6000 RPM.
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If those are merc 4 blade cleavers, I have never seen them run as well as the 3 blades. Have had really good luck with the Dewalds as well on a 28 with 300XS's. You may want to raise and lower them some if you are set on keeping these props and see what your speed and slip does.
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Lose the merc 4 blades. I have tried them on two outboard cats and also a 28 skater. Good midrange and punch but no top end at all. Three blade Merc lab cleavers are the best. 15x32 might be prop.