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  1. #1

    what causes this to happen??

    i have my oe sponsons stepped and yesterday at the dam i was trying my ski with a few aother gp 1300's and FX's and i find that at times it jumps out the water and i lose speed then i gain speed and when i actually gain max speed the ski bobs out the water and i lose the speed and lose position badly .my ski is stock standard with only sponsons stepped for now.the correct term wud be porpoising???

    when i race other ski's all gp's are stock as well so normally i get the edge in front but then the ski decideds to bob in and out the water making me lose speed and momentum

    guys pls comment and help


  2. #2
    quadzilla's Avatar
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    Lightbulb ?

    Hey there

    You probably need to shim your trim tabs down a little..

    Start with one .060 washer under all 8 bolt's..

    G....

  3. #3
    quadzilla

    what unit of measurement u freering to on th 0.60 washer??

  4. #4
    quadzilla's Avatar
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    Lightbulb ?

    Hey there..

    Imperial measurement..

    ITS .06 .!

    .60 is over half an inch..

    As a rough guide .020 is about a half a mm so you're looking to start about 1.5mm under all 8 bolts..

    If you still have the black plastic tabs.. then get larger diameter washers at least 2cm's

    Gerry

  5. #5
    Quadzilla

    thanks.

    so u saying1.5mm in thickness of washer and 2cm in diameter cause i still have stock trim tabs??

  6. #6
    quadzilla's Avatar
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    Quote Originally Posted by Full_Throttle View Post
    Quadzilla

    thanks.

    so u saying1.5mm in thickness of washer and 2cm in diameter cause i still have stock trim tabs??
    Yeah..

    The bigger diameter washer are better since the tabs have little bushes in them..

    So the larger washers help to spread the load..

    You'll understand when you take them off...

    NOW:. you MUST be very cautious when you're removing these tab bolts..
    Its likely they've never been removed before.. so they'll be in there good and tight..
    These little bolts can shear very very easily..
    So if you have a little blow torch.(the small type with a very fine flame) its a good idea to heat these bolts slightly..

    Take it easy with them..!!!

    Gerry

  7. #7
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    Quote Originally Posted by quadzilla View Post
    Hey there..

    Imperial measurement..

    ITS .06 .!

    .60 is over half an inch..





    As a rough guide .020 is about a half a mm so you're looking to start about 1.5mm under all 8 bolts..

    If you still have the black plastic tabs.. then get larger diameter washers at least 2cm's

    Gerry
    MAY be Jerry can post a CONVERTION CHART for these guys that don't understand the american measurements?
    I find that Funny because I work for a German company and they all work in the metric crap, It took me a while to figure out the metric system. I use a pair of calipers and then hit the button that switches from in to mm.

  8. #8
    i think a conversion chat will be of great assiatnce so when guys post the imperial figures we can use the chart to quickly convert and understand

    thanks

  9. #9
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    porpoising???

    porpoising???
    You can shim you tabs that will work.
    You can also try adjusting your riding postion.
    JMO.,,,,,, You need to find a postion that you Are ALL WAYS GOING TO RIDE IN!. just changing you riding postion will have a large affect on you ski.
    Do you have a tack yet?
    Do you have a GPS?
    If you are running a modded plate. try shimming the rear of the plate down until the Porpoising goes away. 3 mm of shim under the rear bolts should do it.

  10. #10
    Great lakes.thanks.i will shim my trib tabs for now.

    i still have standard ride plates on.Im awaiting delivery from Carl on my new R&D rideplate Island racing Mod 4.so for now everything standard


    when u talk of ride postion ,normally i ride when running at full throttle,standing right at the back kepping low as possible trying to tuck my upper body under the visor.what position do u recommend?

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