Next step, wedge or ride plate
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Next step, wedge or ride plate

  1. #1
    Cole SS cole ss's Avatar
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    Default Next step, wedge or ride plate

    I am still having a problem with porpising. I have a Cole 20' SS. 454 stock, 12Jg, place diverter , fresh pump . Weight is about 2400 Lb. Boat is mainly a family boat. In order to not porpise I must keep my diverter at a 4:00 position. If I move it to a 3:00 postion it will porpise. I did put a ski type loader on. I did gain 5 mph . My boat does 55 mph. When I am in the 4:00 position it rides great , but I can tell that it is holding the boat back. As I move the diverter to the 3:00 position the boat picks up speed , but also wants to porpise. Giving it a quick bit of gas will help , but it still wants to go back to porpising. I don't have enough Hp to blast thru it. Also I am having problem when I pull my kids on a tube. Even with the diverter all the way down , on plane , the water from my jet seems to want to shoot down into the water and come back up as a small rooster tail ? It sounds weird . I have never had a boat do this. It shoots back up about 12' from the back of the boat. Enough that I can't see the kids. When I turn the boat the small tail goes away. Can anyone help ? I like the boat . I want to get proper set up before I start adding preformance up grades. Where would you start? Thank You.
    Last edited by cole ss; 08-09-2009 at 08:33 PM.

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  3. #2
    Senior Member Boat 405's Avatar
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    I would try a droop or if you already have a droop wedge it down, so the fat part of the wedge faces up.

    I had a porpoise on my old boat (21' eliminator mojave daycruiser) at about 30-35 it liked to porpoise with anything above center on the diverter. I put a wedge on it to lower the thrust line and it significantly helped and freed up the boat too. Didn't make it go away completely but it helped.

    A droop alone will help lower the thrust line too, but most droops have a slight up degree of nozzle built into them. I would play around with a droop and wedges till you find a combo that works before you take the intake out of the boat to install a ride plate.
    Boat 405.

  4. #3
    Cole SS cole ss's Avatar
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    What size of droop would you use? How much wedge? I would like to get this right. Thanks

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    Senior Member Boat 405's Avatar
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    Quote Originally Posted by cole ss View Post
    What size of droop would you use? How much wedge? I would like to get this right. Thanks
    I used a standard droop like this one from american turbine.
    I used this one with a 4 degree wedge. It will be a bit of trial and error. All boats react differently. some like droops, some don't. Lowering the thrust angle usually helps in my experience.
    Boat 405.

  7. #5
    Cole SS cole ss's Avatar
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    What about using a wedge on my stock pump?

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    Member twowheeledfish's Avatar
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    Quote Originally Posted by cole ss View Post
    What about using a wedge on my stock pump?
    Man, it sure doesn't hurt to try! This would certainly be the cheapest solution. But widowmaker is right, to solve the problem you're gonna have to move your thrust vector (both the angle and origin). This can be accomplished by using snoots (droop or straight) and wedges, or some combination thereof. The farther aft you can get your diverter from the rear of the boat, the longer effective lever arm you have to control the boat's attitude. Think of the pump as a big pry bar that is used to leverage the hull higher and lower in the water.

    How much wedge or droop? You're gonna have to experiment with some combinations, as no two boats are the same. Best is to find someone with spare parts to try first. Good luck!

  9. #7
    SLOW MEMBER slowboy's Avatar
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    I fought and fought with a porpous on my boat for over a year. I tried different ride plate angles, droops, wedges and just couldnt get it to settle down. I finally tried a blocked loader and the boat tamed way down. I was then able to fine tune it with the ride plate.

    Just another idea.
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

  10. #8
    Cole SS cole ss's Avatar
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    How would a blocked loader help? Can you have a ride plate without a shoe. I can't afford to pull my intake and have it milled, but a ride plate might really help. Anyway it seems like it would.Thanks

  11. #9
    SLOW MEMBER slowboy's Avatar
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    Quote Originally Posted by cole ss View Post
    How would a blocked loader help? Can you have a ride plate without a shoe. I can't afford to pull my intake and have it milled, but a ride plate might really help. Anyway it seems like it would.Thanks
    I dont know how the blocked loader helped, but it did. I dont know how you can put a ride plate on with out puttng on a shoe.

    Maybe instead of putting on a ride plate, try some trim tabs. I have seen some people have to do that to get the porpous out.
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

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    Senior Member DuaneHTP's Avatar
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    I dont know how you can put a ride plate on with out puttng on a shoe.
    This kit works well for what he's trying to do;

  13. #11
    SLOW MEMBER slowboy's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    This kit works well for what he's trying to do;
    Hey Duane,

    Is that not a shoe on the front of that ride plate?
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

  14. #12
    Senior Member DuaneHTP's Avatar
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    Absolutely, it's an add on shoe that makes adding a ride plate easy without having to pull and machine the intake for those who don't want to go through the process. Didn't mean to offend you, was just showing an easy way to do what he wanted. Sorry!

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    Senior Member GAWnCA's Avatar
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    So how is it attached if you don't need to pull the intake and machine it?
    Wags

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    Senior Member stc315's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    Absolutely, it's an add on shoe that makes adding a ride plate easy without having to pull and machine the intake for those who don't want to go through the process. Didn't mean to offend you, was just showing an easy way to do what he wanted. Sorry!
    I'm interested in this, how does it mount? I was about to buy one of those place divertor droop w/bolt on ride plate dealios but I like this idea better.

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