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  1. #1
    Sea-Yaa's Avatar
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    Crazy Thought (picking up some mph)

    We spray silicone spray on our engines to repeal salt water and make it easier to have a clean engine but has anyone thought about spraying it on the bottom on our hulls to repeal water and gain speed... Less water friction.
    You'd spray it on right as you launch and of course soap and water the ski when you got home so not like it just sit on there.

    Would you think you would pick up some mph or just a waste of silicone spray?
    Would it do any damage to the gelcoat?

    -Rob-


  2. #2
    Whats that whistling noise? jtskier11's Avatar
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    Quote Originally Posted by Sea-Yaa View Post
    We spray silicone spray on our engines to repeal salt water and make it easier to have a clean engine but has anyone thought about spraying it on the bottom on our hulls to repeal water and gain speed... Less water friction.
    You'd spray it on right as you launch and of course soap and water the ski when you got home so not like it just sit on there.

    Would you think you would pick up some mph or just a waste of silicone spray?
    Would it do any damage to the gelcoat?

    -Rob-
    Speed trick..... Sand the bottom of your hull. Dont wax it. Making it slick creates drag. You want to create lift!!

  3. #3
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    Its been discussed many times in the past, like waxing the bottom of a ski...As the ski runs through the water it would basically "power wash" anything off in a few seconds.

  4. #4

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    Sanding the bottom of ski creates little air pockets, which makes the ski run on micro bubbles and supposedly makes you go faster.

  5. #5
    Sea-Yaa's Avatar
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    What grit? Sand the lowest points of the hull or the whole bottom?
    Anything free to pick up some mph is a great thing
    It wouldn't tear it up under there

  6. #6
    Whats that whistling noise? jtskier11's Avatar
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    Quote Originally Posted by Sea-Yaa View Post
    What grit? Sand the lowest points of the hull or the whole bottom?
    Anything free to pick up some mph is a great thing
    It wouldn't tear it up under there
    100 grit paper in light, FULL STROKES front to back. You wont need to do much area. When on plane at speed not much of the hull is touching the water anyway. Friend and I did this on his old XP. I could tell a little difference in how it handled/turned. Didnt notice much on top end. You results can obviously differ.

  7. #7
    HOSS's Avatar
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    Exclamation

    Sanding the "patch" is always good for speed. But this speed is very minimal on these hulls and best left for speed junkies trying for the GPS bragging rights. ANYONE else,,,dont do it.

    Air bubbles created (airation) from a non smooth surface helps un -wetten the hull reducing drag. Drag in this case for common knowledge would be considerred as friction or in marine applications,,,,,yes even vacuum or suction in certain "hook" designs. But this all pertains to speed and where the hulls life is spent in the water. In this case the hull does not spend any life in the water. Rather just the last aft midpoint. On bass boats it was/is a delta pad. But that is a different drive system. This is a jet,,,jets love water. Not air.

    Basically sand behind jet,,,NOT in front of intake. By the way front to back is bs for this operation. Circular ,like a DA, is best. Its a random pattern and go medium. 400 grit is perfect. Thats inner chine, chine to chine, and up to intake front. There you have it.

    You will also lose some stability. So if`n you ain`t riding glass,,,all the time,,,it ain`t for you. Period.

  8. #8
    Whats that whistling noise? jtskier11's Avatar
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    Quote Originally Posted by HOSS View Post
    Basically sand behind jet,,,NOT in front of intake. By the way front to back is bs for this operation. Circular ,like a DA, is best. Its a random pattern and go medium. 400 grit is perfect. Thats inner chine, chine to chine, and up to intake front. There you have it.
    To each their own. There is so much mixed shit about this on the internet. There really is no wrong way to do it. No scientific proven methodology for sanding the hull. Ya either do it or ya dont.

  9. #9
    HOSS's Avatar
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    Cool

    30 years in jet boats ain`t a theory.

  10. #10
    Whats that whistling noise? jtskier11's Avatar
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    Quote Originally Posted by HOSS View Post
    30 years in jet boats ain`t a theory.
    Meh. Im not too worried about it either way. Not for a tenth of a MPH.

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