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  1. #1

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    Tried stepped sponsons yesterday

    Stepped the sponsons on my recently rebuilt '01 GP1200R. Hit 60.5 mph on GPS only "mods" being D-plate & wave eaters. The back end of the ski had a mind of its own from 17 to 23 mph. I felt like a dog uncontrollably wagging my tail. Ski tracked well at other speeds so I guess I'll just avoid 17 to 23. Curious if this is normal.
    Thanks.


  2. #2
    WATER WOODY's Avatar
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    Quote Originally Posted by toyterrific View Post
    Stepped the sponsons on my recently rebuilt '01 GP1200R. Hit 60.5 mph on GPS only "mods" being D-plate & wave eaters. The back end of the ski had a mind of its own from 17 to 23 mph. I felt like a dog uncontrollably wagging my tail. Ski tracked well at other speeds so I guess I'll just avoid 17 to 23. Curious if this is normal.
    Thanks.
    Yes, very common for the GPR to wag its tail at those speeds.

  3. #3
    "just sayin".. jetdave56's Avatar
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    Quote Originally Posted by WATER WOODY View Post
    Yes, very common for the GPR to wag its tail at those speeds.
    we talking 'chine walking' here right ...

  4. #4

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    Quote Originally Posted by jetdave56 View Post
    we talking 'chine walking' here right ...
    yes

  5. #5
    That`s the happy Dance!

  6. #6
    WATER WOODY's Avatar
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    Quote Originally Posted by jetdave56 View Post
    we talking 'chine walking' here right ...
    In technical terms yes.

  7. #7
    Stop staring at my tits NJJer's Avatar
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    I thought chine walk was when it would ride on one side of the hull and then rock over to the other? A rocking from side to side moevment with no real "center" position.

    I took TT's explanation to sound like a loose in the rear feeling and not chine walk.

  8. #8
    the ski is at the speed where it is not on plane, riding on the flat of the ride plate and tipping from chine to chine. I have found this to happen more with the stock ride plate VS a modded plate with skegs. one is less drastic than the other...

  9. #9
    "just sayin".. jetdave56's Avatar
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    Quote Originally Posted by toyterrific View Post
    Stepped the sponsons on my recently rebuilt '01 GP1200R. Hit 60.5 mph on GPS only "mods" being D-plate & wave eaters. The back end of the ski had a mind of its own from 17 to 23 mph. I felt like a dog uncontrollably wagging my tail. Ski tracked well at other speeds so I guess I'll just avoid 17 to 23. Curious if this is normal.
    Thanks.

    you see Andy I tried using the "search" feature and this is what I got...
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	dog2.jpg 
Views:	75 
Size:	75.2 KB 
ID:	220744  

  10. #10
    Superman! fivespeedsteed's Avatar
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    yeah its called porpoising and they do do it right before they pop on a plane. if you think its bad with 1 person take a friend for a ride

    a plate will help kill most of it from what i hear, and if you absolutley have to get rid of it and will sacrifice a mph or 2 for killing it get extended trim tabs.

    my ski did it less when i stepped the sponsoons. but still did it

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