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DA-170 Engine Relation to Mejzlik32x10L Prop

Discussion in 'Beginners' Lounge' started by alberto59569, Sep 4, 2015.

  1. alberto59569

    alberto59569 New to GSN!

    If you have a DA-17o engine and it is rotating at 1,500 rpm does that mean that the Mejzlik 32x10L propellor is also rotating at 1,500 rpm?

    How would one go about determing the rpm of the prop if the rpm of the engine is know?

    Thanks for the help.
  2. Alky6

    Alky6 150cc

    The propeller rotational speed (revolutions per minute,rpm) and the engine speed are the same (assuming the propeller is securely fixed to the shaft). Hope that answers the question?
  3. so how does one find the tip speed of the prop to know whether the prop will go supersonic at somepoint in the RPM range.

  4. bigblueswope

    bigblueswope 100cc

    3.14 x Prop Diameter x RPM = Inches per Minute of prop tips

    768 MPH / 60 * 5280 * 12 = Inches per Minute of Sound

    BJ Swope
    Alky6 likes this.
  5. Alky6

    Alky6 150cc

    I added some clarifying parenthesis on your second equation.

  6. Colt4570

    Colt4570 New to GSN!

    I'm not good at the calculations, but I can tell you that my DA 170 with a 32x10 prop will rip pretty good at about 3/4 throttle.

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