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  1. #1

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    How to measure prop pitch

    So I decided to do some measuring on my 17/22 just for reference. Do you measure the angle of the forward side or the backside? Due to the thickness of the blade, it changes the angle by 5+ deg depending on which side you measure.

    I guessed that I should measure on the back side (this would be the "pressure" side) and got that my prop is actally a 17.5/20.

    Mike


  2. #2
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by engineermike View Post
    So I decided to do some measuring on my 17/22 just for reference. Do you measure the angle of the forward side or the backside? Due to the thickness of the blade, it changes the angle by 5+ deg depending on which side you measure.

    I guessed that I should measure on the back side (this would be the "pressure" side) and got that my prop is actally a 17.5/20.

    Mike
    Measure the side that pushes the water.

  3. #3
    Pilot_85's Avatar
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    Whats the first number? and the second?

  4. #4
    Moderator RX951's Avatar
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    Quote Originally Posted by Pilot_85 View Post
    Whats the first number? and the second?
    the first number is the leading edge
    the second number is the trailing edge

    Here is a pic of a leading edge being measured


  5. #5
    cbrich's Avatar
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    Quote Originally Posted by RX951 View Post
    the first number is the leading edge
    the second number is the trailing edge

    Here is a pic of a leading edge being measured

    Where did you get this?

  6. #6
    Moderator RX951's Avatar
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    Quote Originally Posted by cbrich View Post
    Where did you get this?
    that is a template I got from Fernando that he had printed on some clear transparency.

    2fast4u sells them also printed on clear lexan cylinders

    Here is the template if you wish to print your own on clear transparency

    http://greenhulk.net/forums/showthre...impeller+pitch

    ,
    ,

  7. #7
    cbrich's Avatar
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    Do we mess with the leading or trailing edge when fine tuning the impeller.

  8. #8
    Looking for a job gtxsc03's Avatar
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    Last edited by gtxsc03; 03-24-2008 at 11:05 PM.

  9. #9

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    Ok, so WFO says to measure the side that pushes water, which I did, but the pic posted by RX951 shows that he's measuring the opposite side (that doesn't push water).

    Mike

  10. #10
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by engineermike View Post
    Ok, so WFO says to measure the side that pushes water, which I did, but the pic posted by RX951 shows that he's measuring the opposite side (that doesn't push water).

    Mike
    From his pic you measure the bottom edge of the blade.

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