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  1. #1
    can't leave nothin' alone! scrappy's Avatar
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    impeller pitch ?

    What do the numbers in the impeller pitch mean?
    do the bigger #'s mean a more agressive (more power to turn)impeller or a milder impeller?


  2. #2
    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
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    The numbers are the pitch of the impeller in degrees. 0 would be in line with prop rotation and 90 inline with pump flow. The first number represents the angle of the leading edge of the prop and the latter number the trailing edge angle.

    e.g. a 15/20 starts at 15 degrees and transitions to a final angle of 20 degrees.

    And yes a larger number is a larger or taller prop and requires more power to turn it.

  3. #3
    can't leave nothin' alone! scrappy's Avatar
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    Quote Originally Posted by DarthAWM View Post
    The numbers are the pitch of the impeller in degrees. 0 would be in line with prop rotation and 90 inline with pump flow. The first number represents the angle of the leading edge of the prop and the latter number the trailing edge angle.

    e.g. a 15/20 starts at 15 degrees and transitions to a final angle of 20 degrees.

    And yes a larger number is a larger or taller prop and requires more power to turn it.
    That is what I thought!

    I Have searched and found that a 15/23 is what is recommended for my machine but an new machine with 3X the power actually uses LESS pitch?

  4. #4
    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
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    Quote Originally Posted by scrappy View Post
    That is what I thought!

    I Have searched and found that a 15/23 is what is recommended for my machine but an new machine with 3X the power actually uses LESS pitch?
    The required pitch also has to do with prop RPM, pump, and venturi size. That's why my 96 XP and the new X skis use almost identical pitches

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