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  1. #1
    Registered mavrick10's Avatar
    Join Date
    Jan 2004

    Cavitation Plate and Blade Flex= broken prop

    I'm having a little problem. I've broken 2 props now and it's due to the blades flexing and barely grazing the cavitation plates. You can see on the bottome of the plate where the blade has barely come into contact with it. These were both 15 1/4 " diameter Bravo 1's. I've just ordered some 15 1/2 " Herrings so this is kind of worrying me a little. Should i take off the cavitation plates?? Or will the boat be too hard to get on plane?? Any suggestions?

  2. #2
    My Boats:
    Join Date
    Aug 2003
    Pompano Beach Fl

    Re: Cavitation Plate and Blade Flex= broken prop

    you could take off the plate planning time will increase very minamal if it is a problem then try the new maximus props from merc.

  3. #3
    Registered TablerockToy's Avatar
    My Boats:
    32Fountain 28Pantera
    Join Date
    Feb 2003

    Re: Cavitation Plate and Blade Flex= broken prop

    You should be just fine with the new props. Im assuming your running bravo drives? they can run up to a 16" prop with no contact. If you would put up a pic of the damage I could probably tell ya whats going on, But just taking a educated guess Id say that the stepped bottom of your boat is flexing the props, they are cracking(fairly common) and hitting the cavitation plate as they are braking

    Later CJ

  4. #4
    JC is offline
    Registered JC's Avatar
    My Boats:
    2004, Cigarette, Tiger
    Join Date
    Nov 2003
    Monroe, WI

    Re: Cavitation Plate and Blade Flex= broken prop

    I lost a plate once (took out the prop) the boat was a pig to get on plain... Prop broke would break loose very easy.

  5. #5
    Official OSO boat whore Charter Member
    My Boats:
    8' row boat
    Join Date
    Oct 2000
    Mequon, WI

    Re: Cavitation Plate and Blade Flex= broken prop

    The boat will definetly cavitate with a high x-dim when planing. My boat has the cavitation plate bolted on and I once forgot to reinstall it. I couldn't even plane off. Put the plate back on and boat poped up with only a little slippage. It all depends on the hull, x-dim and prop. With a deep drive, I could see there being no difference.

    My guess would with the Herrings being stronger that you won't be flexing the blades as much.

  6. #6
    45 Lip Ship / 900 Zul's Platinum Member ONESICKGLADIATOR's Avatar
    My Boats:
    Working on something new
    Join Date
    Feb 2004
    Slowing down so you can catch up

    Re: Cavitation Plate and Blade Flex= broken prop

    Check your prop shaft in your drives to see if it is out of wack

    Rick OSG

  7. #7
    Forum Regulator VIP Member Sydwayz's Avatar
    My Boats:
    37' Active Thunder AVH; 17' Speedliner Cat OB
    Join Date
    May 2001

    Re: Cavitation Plate and Blade Flex= broken prop

    Been there!! I actually had the prop blade begin to tear, and sliced the cavitiation plate, anode, and drive shower up. Say hello to a replacement lower case (B1-XZ appliaction).
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