31ss that runs 80+????
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11-02-2002, 11:38 AM
#42
Charter Member #655
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I've never put any stock in my speedo...its barried at 80+ when running 74 on GPS but the tach I've never suspected to be wrong........if it was off significantly I think I would be able to hear it......
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If your boat has a sail do you ride a horse to the ramp?
If your boat has a sail do you ride a horse to the ramp?
11-02-2002, 11:41 AM
#43
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http://www.boatramp.com/prop_applet/...erAppletG.html
play with the math and let us know what you come up with
chances are the tachs are correct or w/in 100rpms.
play with the math and let us know what you come up with
chances are the tachs are correct or w/in 100rpms.
11-02-2002, 11:52 AM
#44
Charter Member #655
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Looks like for the #'s to work out I'm running closer to a 25 pitch prop.....thats if the #'s are right.....what is an exceptable % of slip?13-15?????
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If your boat has a sail do you ride a horse to the ramp?
If your boat has a sail do you ride a horse to the ramp?
11-02-2002, 12:12 PM
#47
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well....let's say you changed the original gearing to 1.36 and turned your 23's to 5100....at 74 mph ....that under 10% loss...better than any v hull i know. are these the same props you used prior to your engine mods/rebuilds?
11-02-2002, 12:22 PM
#49
Charter Member #655
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both Tachs read the same and no I havent changed props since the engine up grade...I did have one toughed up after I hit some sh@#......
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If your boat has a sail do you ride a horse to the ramp?
If your boat has a sail do you ride a horse to the ramp?
