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  1. #1
    Matrix 200 suparoo's Avatar
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    Msx Impeller Specs.

    Does anyone know what the specs are for the impellor that was put into the Matrix's by Baxter. The only specs I can find are "707 Lightened 0.040"
    I've got the attached gauge but don't have the specs for the blade or know how to use the gauge.
    Can anyone help.
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    Last edited by suparoo; 11-11-2009 at 04:30 PM.


  2. #2
    Matrix 200 suparoo's Avatar
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    O.k I've talked to Mark Baxter and found out that the impeller in the Matrix is just a standard Polaris Msx impeller Ptno5132707A.

    Does anyone have a brand new one that they could messure the pitch on for me and let me know. I read just about every post on pitching a blade and think I have an idea of what to do the pitch is just measured on the first 2 1/2" of the trailing and leading edge.


  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Arrow 5132707A impeller pitch

    Quote Originally Posted by suparoo View Post
    O.k I've talked to Mark Baxter and found out that the impeller in the Matrix is just a standard Polaris Msx impeller Ptno 5132707A.

    Does anyone have a brand new one that they could measure the pitch on for me and let me know. I read just about every post on pitching a blade and think I have an idea of what to do the pitch is just measured on the first 2 1/2" of the trailing and leading edge.
    5132707A - I wonder what the A suffix means?

    I have a spare 5132707A, but I don't have a fancy pitch gauge to measure it with. I suppose I could print out a paper one, but it might not be accurate enough to help you.

    That unmodified spare 5132707A impeller was purchased from Martin (desperado), and he measured it as 13/20.5, and also marked the 'factory spec' pitch of 12-22.

    I don't know where he got that spec from, nor do I know which particular pitch gauge he used. There can be different results from the different gauges.

  4. #4
    Matrix 200 suparoo's Avatar
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    Hmmm thats quite a difference if you want to measure yours I've attachced a couple of different versions of pitch gauge. I just printed one out on a "clear presetation binding cover i.e clear piece of A4 size paper" the ink will smudge if you touch it but would do for a quick reference.

    Here's a breif rundown on pitching I copied.

    On the leading edge of the blade, measure 2 inches from the tip of blade.
    put a mark on each blade with a felt tip pen, on the edge of blade then
    set prop inside the pitch gauge. line up mark with blue lines on gauge find
    the line that best matches fom the mark back to the tip of blade most props
    are usualy a 13 or 14 . On the trailing edge of blade measure from tip back
    up blade 2 inches and mark each blade then put prop in gauge and line up mark
    with red lines find the line that matches from mark to tip on end of blade
    usualy 19 or 20 . when the correct pitch is matched to gauge the blade will
    be hidden by the mark. Try moving same prop blade to diffrent lings and you
    will see how the blade is no longer hidden by the line on the gauge. you are
    only measuring the first 2 inches of blade or the last 2 inches of blade as
    the middle of blade is the transition section of blade which you can't change.
    . a 14/20 prop usualy checks 13/19+ Notice how all blades don,t match the same
    pitch from one to the other Poor Quality control . The last 2 inches of the
    trailing blade is what you bend to change rpm's Higher pitch # reduces rpm's
    lower pitch # increases rpm's A '1' increase in prop pitch trailing end of
    blade usualy changes 75-100 rpm"s Leading edge pitch changes usualy has to
    to with acceleration only not max rpm's The lower the # on the leading edge
    the better acceleration I usualy run a 13 most of the time and change the
    trailing end to match my desired rpm's I like 7150-7250 on a single pipe ski.
    Attached Files Attached Files

  5. #5
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Did Mark say what the lightening .040 was?

  6. #6
    Matrix 200 suparoo's Avatar
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    No mention of the lightening. But I guess they took the factory prop and somehow maybe with a hand linisher removed .040" off the surface of the blades to lighten it. seems like a very difficult job.
    After I gave the blades a birthday and restored the outer diameter I took it to the local dynamic balancing shop and got it balanced. They put on the inside of the centre hub a peice of stainless about an inch long x 3/8" wide and 1/4" thick. So it was quite a way out and I went to pain staking lengths to make a nice job of building it back up with the plasma welder and filing it back so I shouldn't have thrown it's weight out to much. So it is possible that they were ground down.

  7. #7
    Moderator beerdart's Avatar
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    I think when he said lightening .040 he meant that the impeller is setback .040" This is where you remove material from the hub to set the impeller back closer to the stator veins.

  8. #8
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Ok, Here's the inside scoop on Mark doing prop mods,It's a TOP SECRET SPY PHOTO of Make doing mods on a Matrix prop,so keep it under your hat.

    Here's a link some of the new guys may not have seen,It's ph2ocraft's photo album,Alot of neat stuff hidden there.

    http://www.tripleateam.com/water/v/U...llery/album96/
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  9. #9
    AWA Member 32DegH2O's Avatar
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    I took the lightening .040" to mean that the back/bottom edge of the blades were bent up .040" from stock which "lightens" them up thrust/propulsion wise. Now the impeller can turn to the higher rpms needed.

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by suparoo View Post
    ...if you want to measure yours I've attached a couple of different versions of pitch gauge. I just printed one out on a "clear presentation binding cover...
    Quote Originally Posted by K447 View Post
    ...I have a spare 5132707A...

    That unmodified spare 5132707A impeller was purchased from Martin (desperado), and he measured it as 13/20.5, and also marked the 'factory spec' pitch of 12-22...
    Using the posted PDF gauge, printed on an acetate letter sized sheet, the spare 5132707A impeller I have measured as follows;

    13.2 to about 14.0 degrees on the leading edges. The three blades varied slightly from one the next.

    Trailing edges all measured about 22 degrees, and were more consistent.

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