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  1. #1
    Live to RIDE. brendus's Avatar
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    How to measure the pitch?

    just received my new 15-22r impellers and i want t measure the pitch for myself. how is this done using a vernier??? so to check wether its actually close to 15-22.
    thanks


  2. #2

    Join Date
    Aug 2006
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    Gonzales, La
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    I check mine with a digital caliper and get pretty good numbers. My method is as follows:

    - Set the caliper to 5 mm.
    - Scribe pencil marks on the tip of the blade 5 mm from the leading edge and 5 mm from the trailing edge.
    - Set the caliper to 20 mm.
    - Scribe pencil marks on the tip of the blade 20 mm from the first pencil marks.
    - Set the prop on a flat surface with the TE facing down.
    - Measure the distance from a flat surface to the bottom of the blade at each of the pencil marks.
    - Calculate the angle using this formula:

    LE angle = asin ((height 1 - height 2)/20)
    TE angle = asin ((height 3 - height 4)/20)

    Mike

  3. #3
    Live to RIDE. brendus's Avatar
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    awesome.thanks will give it a go now.

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