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  1. #1

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    What does prop numbers mean?

    15/20R mean?


  2. #2

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    leading edge and trailing edge pitch. This has been discussed numerous times so a search should pull up the info.

  3. #3
    Sanfish's Avatar
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    To elaborate slightly, its the angle in degrees of the leading/trailing edge.

    Don't think for a moment all brands of "15/20" impellers are the same in terms of how they actually perform!

    Leading edge (15)= The part of impeller near inlet. Generally helps with bottom end. Lower number = better bottom (far more complicated but you get the idea).
    Trailing edge (20) = The part of the impeller that is near outlet. Generally helps top end (and/or peak RPM).
    Prop = Propellers are used in open configurations like outboards and out-drives and airplanes.
    Impeller = Impellers are inside a housing or shroud, pwc jet-pumps and water power plants.

  4. #4

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    Awesome! Better than what I found in Google!

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