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  1. #1

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    what pitch prop will be best

    hi guys, its my first post as most of my questions get answered just by searching, however this time i need to ask,

    im not sure what prop to run now i have further modified my rxp and thought i would ask before trial and error.

    the previous spec was

    riva air intake
    resonator removed
    stock charger with washers done
    solas concord r 14/19
    r/d aquavein grate as i ride in the chop a fair bit

    the ski ran 68.3 on gps on a small chop day dead on 8100

    i have since fitted a rear exit exhaust
    rotax racing charger wheel
    boost guage to see what its running
    turbosmart bov as the bosch is useless

    i have a solas/riva 3 blade15/20 swirl which i was told would work perfectly with this setup, however im not sure as i dont have a intercooler yet as i only have stock injectors and think it may be low on revs

    so the question is, will the 15/20 be low in revs and need repitching to suit my setup, or am i best to repitch the solas 4 blade to suit

    or does anyone think either prop will be fine

    advice much appreciated
    Last edited by russ; 08-27-2009 at 06:36 PM. Reason: spelling


  2. #2
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by russ View Post
    hi guys, its my first post as most of my questions get answered just by searching, however this time i need to ask,


    Im not sure what prop to run now i have further modified my rxp and thought i would ask before trial and error.

    the previous spec was

    riva air intake
    resonator removed
    stock charger with washers done
    solas concord r 14/19
    r/d aquavein grate as i ride in the chop a fair bit

    the ski ran 68.3 on gps on a small chop day dead on 8100

    i have since fitted a rear exit exhaust
    rotax racing charger wheel
    boost guage to see what its running
    turbosmart bov as the bosch is useless

    i have a solas/riva 3 blade15/20 swirl which i was told would work perfectly with this setup, however im not sure as i dont have a intercooler yet as i only have stock injectors and think it may be low on revs

    so the question is, will the 15/20 be low in revs and need repitching to suit my setup, or am i best to repitch the solas 4 blade to suit

    or does anyone think either prop will be fine

    advice much appreciated
    Welcome to the forum!

    I am pretty sure the 3 blade will be too much prop. It might could be depitched alot but is meant to run with riva stage 3 setups so probably will dog the boat pretty bad.

    I am not familar with the boost of the rotax wheel but you might need more fuel and you would need some pitch added to 4 blade (if wheel is green wheel boost or more) and can be done, but if the wheel makes some decent boost you would be better off with a 15/20 4 blade and go from there.

  3. #3
    Moderator RX951's Avatar
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    welcome to the forum

  4. #4
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    With just the addition of a SC wheel... at the most you will just need to add a little pitch to the trailing edge of your 14/19 to keep your RPM's at 8100.

  5. #5
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by bigdaddyRXP View Post
    With just the addition of a SC wheel... at the most you will just need to add a little pitch to the trailing edge of your 14/19 to keep your RPM's at 8100.
    Is the rotax similar to the green wheel or less boost?

    If so, Bigdaddy is correct about the 14/19 working with some minor tweaking.

  6. #6
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by skoepp View Post
    Is the rotax similar to the green wheel or less boost?

    If so, Bigdaddy is correct about the 14/19 working with some minor tweaking.
    I believe it's real close in performance

  7. #7

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    im led to belive that the rotax wheel is slightly better than the green wheel, im not sure if it will need more fuel as im still running stock intercooler so hope it will be fine.

    ok so as i thought the 3 blade will over prop the ski, so the million dollar question is, how much shall i repitch the 14/19. 200 rpm?

    im basing this on the fact i have added the sc wheel, through exhaust, and opas removal so surely these mods will produce enough power for 200rpm?

    more or less is the question, as i dont want to me trial and error too much.

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