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  1. #1

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    Variable Exit Nozzle

    I have perfected a computer controlled variable exit nozzle that is impervious to debris and salt water and has been adapted for use on any personal watercraft (PWC). The prototype has been designed to mate with a Yamaha FZR/S.
    In order to calibrate the systemís control software, it is essential that the nozzle be tested on a Yamaha FZR/S. I am in the Phoenix, AZ metropolitan area and am looking for the use of a watercraft of this model. Any help or involvement in this regard would be greatly appreciated.
    I look forward to any comments or questions regarding my request.


  2. #2
    lets race.... mikeFZR's Avatar
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    Interesting...

  3. #3
    I am too far away to be of any help but this (Variable Exit Nozzel) is somthing I always thought would make sense on PWC!!

  4. #4

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    There is a big scene in lake havasu, that may be a good place to check that is somewhat local.

  5. #5

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    It does make sense; there are no negatives, we gain at both ends!
    Let’s use a stock FZR as an example:
    The stock nozzle is 86 mm.
    By closing down the nozzle to 79-80 mm we load the pump from behind, virtually eliminating cavitation.
    As the watercraft accelerates the nozzle opens to
    87-88 mm for maximum midrange acceleration.
    Once top speed is reached the computer will notch the nozzle down a tenth of a millimeter at a time until best top speed is reached.
    And all this happens in about 8 seconds.

    Thank you for your interest and comments.
    DD

  6. #6
    Moderator beerdart's Avatar
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    Interesting.. Welcome to the Hulk..


    OEM reduction nozzle for fzr/fzs size is 82.5 mm , Gpr oem reduction nozzles are 85mm or 87mm

  7. #7
    Banned User
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    Quote Originally Posted by dd Harness View Post
    It does make sense; there are no negatives, we gain at both ends!
    Let’s use a stock FZR as an example:
    The stock nozzle is 86 mm.
    By closing down the nozzle to 79-80 mm we load the pump from behind, virtually eliminating cavitation.
    As the watercraft accelerates the nozzle opens to
    87-88 mm for maximum midrange acceleration.
    Once top speed is reached the computer will notch the nozzle down a tenth of a millimeter at a time until best top speed is reached.
    And all this happens in about 8 seconds.

    Thank you for your interest and comments.
    DD
    I see a few problems here; one is the computer is not fast enough to react and either retract or extend the "cone" used to expand or reduce the nozzle. Remember; a lot of people, when they ride, are on and off the throttle, sometime rapidly. Also, if you close down the nozzle to much, your likely to reverse the flow, which could also result in cavitation.

    I believe this has been tried before. I'm pretty sure it's been tried on boats as well. And if I remember correctly, the gains were minimal, at best, versus the cost/complexity ratio.

    Your trying to "re-invent the wheel", that is already round. There are so many other variables to this equation.

    I thought of this a couple of years ago. But, when I talked to a parts manufacturer, they told me it has already been tried, and just wasn't effective, was to expensive, and just wasn't needed.

    This is the same "technology" or idea, with pure jet engines on a fighter.
    Good luck with your research.

  8. #8
    abracadabra's Avatar
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    I like this idea man! good luck with the research. Take care, Julio...

  9. #9

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    Thanks for the Welcome!

    In the world of research and development one of the first rules is:
    Assume Nothing!
    The nozzle I machined fits on a FZR but I did not see it taken off a FZR.
    I will say that I did get different numbers depending on where I measured it.
    No matter, it now opens to 90mm and closes to 75mm.

  10. #10
    lets race.... mikeFZR's Avatar
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    Out of curiosity, can we see some pictures of this nozzle?

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