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  1. #1
    EZ Dock of Long Island Shibby1485's Avatar
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    Sponson Positioning & Effect on speed

    does anyone have facts and/or results about the relationship of sponson position and top speed?

    i went riding... got a speed number.

    i changed 2 things (grate and sponson positioning) and i lost a few mph

    i put back the grate from original test and gained back about half of the lost speed

    now the only thing not the same from original test is sponson position.... can that effect it that much? i know air conditions etc will make my results vary, but the days weren't that astronomically different so i feel SOME of the difference is somewhere in the machine.


  2. #2
    Site Admin Green Hulk's Avatar
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    I have never found a speed difference adjusting the sponsons up/down.

  3. #3
    Been there and back! BDNJ's Avatar
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    Raising the sponsons on the rxp's can be dangerous to your health. I didn't notice any speed change, either, with adjusting the position.

    For comparison:

    Gpr sponsons are the ones that can cause some big drag. Full up on them gives the fastest #'s, but doesn't help w/ hook up. (porpoising) Stepped: up in front and down in rear yields better hook up and .5 - 1.0 loss. And then there's full down which plants them well, but costs 1+ mph in drag.
    Last edited by BDNJ; 07-25-2006 at 01:31 PM.

  4. #4
    Site Admin Green Hulk's Avatar
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    I tried my sponsons in the up position and tried to turn. Talk about scary!

  5. #5
    I had the sponsons set for 2 up riding medium rec, and when solo they dig in hard, so I tried another position, Mounting bar down, sponson blades up and now it does not dig in too hard and will let me power slide.

    If you wanted to really carve in the turns, then I could put them down, down position, BTW they are R&D G-Force sponson, no complaints!...PR...

  6. #6
    EZ Dock of Long Island Shibby1485's Avatar
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    i know the handling gets sacrificed when u move them up... but i'm strictly talking about speed.

    i've heard the same jerry from a few with RXPs... sponson position didn't effect speed. wonder if it does on the 3-seaters.... guess i'll have to test it out on all positions and see if i see any change.

    while we're on the somewhat relevant topic... how can i get rid of my porpoise at top speed? OPAS removed, riva sponsons all the way down and she bounces a little

  7. #7

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    Shibby, there out of the water...they just catch splash from the bottom. The resulting drag is minimal.

  8. #8

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    Quote Originally Posted by Shibby1485

    while we're on the somewhat relevant topic... how can i get rid of my porpoise at top speed? OPAS removed, riva sponsons all the way down and she bounces a little
    Remove the #%&* pump wedge, this should solve your porpoise issue

  9. #9
    Quote Originally Posted by Shibby1485
    how can i get rid of my porpoise at top speed? OPAS removed, riva sponsons all the way down and she bounces a little
    Have someone make you some RE blockoff's.

  10. #10
    You need to find a way to get blockoffs on there and your porpoise will disappear.

    Steve- Remember when you rode my ski on the Hudson and it would bounce. I kept complaining I could not hook up. Well once I put on those blockoffs (riva or Euros, I tried them both) the bounce disappeared and the ski stays planted.

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