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  1. #1
    1996SLTX's Avatar
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    Pump wedges and extended pumps

    I'm going through withdrawals now that the boards are slowing down...

    I read a lot about pump wedges and extended pumps....I guess a pump wedge changes the angle of the thrust to optimize what? Speed, porpoising, acceleration?

    And extended pumps mean what? Ok, a pump that is extended...I got that part, what esle does it mean?


  2. #2
    Bing-A-Ding-Ding-Ding, Brrrrrap! Brrrrrrrrrap!!! Polaris_Nut#1's Avatar
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    You have the extended pump with a 4 degree wedge. A larger wedged like a 6 or 8 degree will lift the the nose of your craft out of the water more, less hull in the water means more speed. Not so good for choppy conditions.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by 1996SLTX View Post
    ...And extended pumps mean what? Ok, a pump that is extended...I got that part, what else does it mean?
    My understanding is that it moves the thrust point farther out the back, which (especially in combination with an extended ride plate) levels the boat out, especially on choppy water. Reduces the tendency of the nose to bounce up and down.

    And when you turn, the thrust being farther out helps get the tail around. How much difference this makes depends on which hull you are starting with. Apparently on the shorter Polaris hulls, like the Hurricane and the SL, the ride change is dramatic.

    Ther are two ways to do the extension. One puts the extension section after the stator, the other puts it in front, which requires a longer drive shaft.

    Having the impeller and stator farther back helps with pump hook up in choppy water, since there is less empty volume to be re-filled with pressurized water before you get thrust. The AAT device does something similar, reducing the volume in front of the exit nozzle.

    If you put a pump wedge on an extended pump, the added leverage of having the nozzle farther back, and angled upwards, forces the rear of the boat down, and the nose rises. The result is less wetted hull surface, and higher speeds.

    The downside is that as you reduce the amount of hull in contact with the water, you reduce the handling stability. Having sponsons on the hull sides helps maintain some stability, up to a point. If you go fast enough with the older hulls, especially the two seaters, they seem to get very snakey.

  4. #4
    Plrs X45's Avatar
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    Yup, you already have the extended pump. Going with the 6 degree wedge will net you 1mph too. As for the boat handling different in choppy conditions? I don't go in the ocean so it handles no different in glass vs. 1, 2, or 3ft. chop. I can see though where the ocean may creat issues with less of the hull in the water.

  5. #5
    ph2ocraft's Avatar
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    Here's a photo at roughly 67 MPH, 6 degree with a 6 vein stainless.
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  6. #6
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    What a Sweet picture! Is that you Al?

  7. #7
    ph2ocraft's Avatar
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    I'm on the Matrix in the back ground, my brother is riding the SLTX.

  8. #8
    Plrs X45's Avatar
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    That's how my X45 looks like (although not quite 67) with the OP rideplate and 6 degree wedge.

  9. #9
    BBCaprice's Avatar
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    Quote Originally Posted by ph2ocraft View Post
    Here's a photo at roughly 67 MPH, 6 degree with a 6 vein stainless.
    Al, how can I get my SLT to do 67? Besides trailer on I-95.

  10. #10
    ph2ocraft's Avatar
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    It starts with trippple pipes. I actually knock on the door of 70 but to make it a tad bit more rider friendly, 67 works good.

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