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Engine/Prop RPM Question

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  • Engine/Prop RPM Question

    My 1999 C90 Yamaha will crank 5500 RPM's at WOT with ease....the book says the gear ratio is 13:26 (2.0)....so how many RPM's is my prop turning at an engine speed of 5500?.....

  • #2
    the convention is that the ratio is stated as engine/prop

    so 2:1 - the engine turns twice for every propeller revolution

    5500 engine rpms the prop is turning 2750


    which begs another question:

    do driveshaft seals typically wear out sooner than propshaft seals?

    and if so - is the reason the difference in shaft rpm?

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    • #3
      Deleted
      Last edited by JerEazy1; 07-27-2017, 08:38 PM. Reason: Because of math
      - Eazy Life

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      • #4
        Robert you know better, cranking and WOT do not relate to each other

        and a lot of prop seals go bad due to fishing line not just wearing out

        Robert listed ratio a 1 to 2 and fairdeal listed ratio 2 to 1
        seems a little different
        Last edited by 99yam40; 07-28-2017, 08:13 AM.

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