calculating band length other than theraband

Discussion in 'General Slingshot Discussions' started by MaddyMax, Sep 5, 2012.

  1. MaddyMax

    MaddyMax New Member

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    i'm really dumb in some kind of things like handling digits or understanding formulas for example. so i would be very thankful, if someone's explaining it to me. <img src="http://illiweb.com/fa/i/smiles/icon_scratch.png" alt="scratch" longdesc="33"><br><br>i really love Jörg for his theraband gold calculator but i want to find out the right length/tapering/layers when having different kinds of rubber/latex of unknown brands.<br><br>otherwise, ... i won't get it anyways ... <img src="http://illiweb.com/fa/i/smiles/icon_cry.gif" alt="Crying or Very sad" longdesc="11">
     
  2. Bert the Welder

    Bert the Welder New Member

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    I'm kinda in the same boat with you Max. My Dyslexia is a really pain. Sometimes some stuff, light formulas, just doesn't translate into something comprehensible to me. Really frustrating.
     

  3. JoergS

    JoergS Administrator

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    I recommend testing the stretch and draw weight. <br><br>Cut a 2cm straight (untapered) strip and tie it to a pole. Then tie a loop on the other side. Measure the relaxed length and the max draw (the point where you feel that further stretching increases the draw very massively, to the point of tearing). <br><br>For Theraband, you will see a factor of about six. A ten centimeter piece can be stretched to sixty cm. If your rubber is less or more stretchy, apply the difference factor to the results of the calculator. So if your rubber type is only stretchable to factor 5, then you need to cut your bands 1,2 times longer. If the calculator says 20 cm, then cut yours 24 cm. <br><br>Next, measure the draw weight. You can easily do that with a fishing scale or any other scale that has a hook for the objects (for luggage and so on). <br><br>Thera Band Gold, 2cm wide, has about 2,6 kg of a draw at full stretch. If yours has more or less, you have your correction factor. <br><br>Example: Your band has a draw weight of only 1,8 kg. <br><br>2,6 divided through 1,8 is 1,44. So you need to multiply the results of the calculator by 1,44 (so you need wider strips). <br><br>Of course this does not mean that your bands will work as good. Many (most) flat rubber bands I tested are a lot slower and/or tear earlier, simply because the quality of the material is less suitable for slingshots.
     
  4. MaddyMax

    MaddyMax New Member

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    wow, thanx a lot Grandmaster Of Slingshots. i think i got it now. we'll see after i bought a fishing scale.<br><br>just to be sure how the tapering works: if i take away 5mm on one side i simply have to add 5mm to the other or am i wrong? should be the same surface area of the band i think (puuh..maths..!).<br><br>i know that theraband is one of the fastest, but i have for example green fitness bands with the same thickness as tbg and they seem not to tear as fast as tbg. also i like the green color more.
     
  5. MaddyMax

    MaddyMax New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Bert the Welder wrote:</b></span></td></tr>
    <tr><td class="quote">I'm kinda in the same boat with you Max. My Dyslexia is a really pain. Sometimes some stuff, light formulas, just doesn't translate into something comprehensible to me. Really frustrating.</td></tr>
    </table>
    <span class="postbody"><br><br>so for people like us, there's sadly no band cutting in the woods without <a href="http://www.slingshotchannel.com/band_calc.html" class="postlink" target="_blank" rel="nofollow">the Theraband Gold Calculator</a>.</span>