Cavitation issues
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Cavitation issues

  1. #1
    Junior Member
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    Default Cavitation issues

    I have a howard shovel hydro. I currently have a 11 1/2 x 16 1/2 cleaver prop. My motor is pushing 550hp. 22* gears. I am having a problem idleing up to around 3k rpm the boat barely moves. I can stomp on the throttle and there is a delay almost like spinning tires off the line. Engine isnt bogging at all. I was recommended to get a 3 blade prop similar in size. What are you guys thoughts on this? I was told it would launch hard, and maintain my current speed that i run....

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  3. #2
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    Welcome to the forums.

    I would think that having more blade area would minimize cavitation issues, but this depends on lots of different factors. Do you see any pitting on the trailing edge of the blades?

    If the prop is under the boat (not behind), have you checked the clearance between the blade tip and hull bottom? If there isn't enough space, lots of issues can happen.

    I'm sure someone more knowledgeable than me will come along to offer more support. In the meantime, you might see if the engineers at Michigan Wheel can help.

  4. #3
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    Michigan wheel aint gonna help a v-drive try bergeron and maybe 18% gears would help

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  6. #4
    Or Seth, either one Budweiser's Avatar
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    Default

    You may consider posting this up in the v-drive section. You'll likely get much more feedback.

    For what it's worth, some slip is intentional and is expected... at least on flat bottom v-drives. I'm not certain about what to expect with a correctly set up hydro. It may (or may not) be perfectly normal behavior. Having previously only had experience with outboards and I/O's, I was a little surprised and thought something was wrong with my set-up when I initially drove my first v-drive.

  7. #5
    Senior Member wagspe208's Avatar
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    IF you are at a total stand still... not moving, and mash the throttle, you should get some slip for a couple seconds.
    IF you are already underway... say going 20 mph ish and mash it... you should not get any slip.
    Propshaft angle is a huge deal.
    I assume... this is an old boat (shovel nose, you said) and the prop is under the boat quite a bit....

    SO.... if not outboard steering you do not want to kick the tail... duh. THIS MEANS you do not want more lift, just hook.
    Check shaft angle.
    Most guys... well, a lot run 17 pitch. Not a huge deal, but shaft angle and blade area are.
    Wags

    Post a pic of the prop.

  8. #6
    Junior Member tonygarrett's Avatar
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    Check the gears in the v-drive they might be in backwards with that prop and gear it shouldn’t burn the prop that hard sound like the gear are in wrong and you under driving the v-drive

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