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Thread: Length of slings?

  1. #1
    Guppy
    Join Date
    02/18/2008
    Location
    Arizona
    Posts
    51

    Length of slings?

    Is there a formula for determining the proper length bands for a spear gun ? I have about 28" from the center of the elongated slot for the rubbers and the center notch on the shaft for the wishbone. I'll be using 9/16 rubber. I don't want to use up the rubber with a lot of trial and error. The old bands on the gun are a mismatch and badly deteriorated from Sun. Hard to tell which,if any, was the proper length.
    Last edited by RonC; 01-26-2010 at 14:11.

  2. #2
    Grouper
    Join Date
    02/10/2008
    Location
    Carquinez Strait
    Posts
    955
    Here are sites that I used for estimating and making my bands.

    MAKO Spearguns - Instructional Info

    how to size tie in bands - Spearboard Spearfishing Community

    From Bill McIntyre:

    1. Measure the distance from the middle of the
    band slot to the center cocking tab.

    2. Double the distance ( for both sides of the gun )

    3. Subtract the length of the wish bone. (Alexander and Riffe's are
    approx 6", Daryl Wong uses about 3".)

    4. Divide the number by 3 1/2.

    5. This is the length of your powerband if you are using a standard 3 1/2
    : 1 stretch ratio. This is a measurement of the powerband from knot to
    knot. For actual rubber length, add 1" to this length or 1 1/2" if you
    are tapering the ends of the powerbands.

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