Band length

Discussion in 'General Slingshot Discussions' started by SpeedyRK, May 6, 2012.

  1. SpeedyRK

    SpeedyRK New Member

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    I've noticed that in a lot of Joerg's slingshots, he uses rollers and such to enable him to stretch the rubber further. Why not just use shorter bands? Does a longer band stretched at the same ratio of a shorter band (same width) produce more power?<br><br>Thank you,<br>Patrick Negus
     
  2. tokSick

    tokSick Senior Member

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    I think it is because it is easier to cock with rollers if you use strong bands and it gives more speed when you shoot( release the trigger).<br>I guess, this is a question for the masters himself.<br>Cheers
     

  3. DaveSteve

    DaveSteve New Member

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    Maybe the time the ammo is pulled by the rubber is a factor. Longer pull = more time the ammo is in contact with the rubber while retracting. And therefore more power.
     
  4. Ryan Wigglesworth

    Ryan Wigglesworth Senior Member

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    <div>The idea is that you max out the rubber... get it?</div><div class="clear"></div><div class="signature_div">
    <br><a href="http://voiceofquran.info/mp3_files/german_quran_mp3/001.mp3" target="_blank" rel="nofollow">http://voiceofquran.info/mp3_files/german_quran_mp3/001.mp3</a><br>my website! <a href="http://wigglesworthswoodwork.webs.com/" target="_blank" rel="nofollow">http://wigglesworthswoodwork.webs.com/</a><br>For your spiritual well being ( more important than anything ) <a href="http://muttaqun.com/" target="_blank" rel="nofollow">http://muttaqun.com/</a>
    </div>
     
  5. SpeedyRK

    SpeedyRK New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Ryan Wigglesworth wrote:</b></span></td></tr>
    <tr><td class="quote">The idea is that you max out the rubber... get it?</td></tr>
    </table>
    <span class="postbody"><br><br>Well I tested out a 4 inch X 1 inch band of theraband gold and found that it maintained its elasticity after being stretched 5 times its own length. That is "maxing" out the rubber. If you stretch it anymore, it loses its elasticity and will permanently stretch (I found there was a 1/8th of an inch deformity per inch of rubber).<br><br>I guess this means I should re-test the experiment using a 4 inch piece again and then compare those results to that of a 5 or 6 inch band. <img src="http://illiweb.com/fa/i/smiles/icon_study.png" alt="study" longdesc="34"><br><br>Thanks,<br>Patrick<br><br>PS Of course there is always the possibility that it is done just because it can be done! I love slingshot physics! <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1"></span>
     
  6. SpeedyRK

    SpeedyRK New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>DaveSteve wrote:</b></span></td></tr>
    <tr><td class="quote">Maybe the time the ammo is pulled by the rubber is a factor. Longer pull = more time the ammo is in contact with the rubber while retracting. And therefore more power.</td></tr>
    </table>
    <span class="postbody"><br><br>The problem with that is that the force applied on the ammo by the elastic would be present for the same duration of time--if not less.<br><br>I suppose what I need to test for this is as follows...<br><br>Will a 6 inch piece of elastic stretched to 30 inches apply the same amount of force as an 8 inch piece of elastic stretched to 40 inches? I'll test it and get back to you guys ASAP. <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br><br>Thanks,<br>Patrick</span>
     
  7. JoergS

    JoergS Administrator

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    Patrick, I have done these tests. The draw weight depends on two things only:<br><br>- the thickness of the rubber<br>- the elongation factor<br><br>That is why you can easily increase the power of a slingshot by extending the draw length. Same draw weight, but a lot more acceleration.
     
  8. SpeedyRK

    SpeedyRK New Member

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    Okay, thanks for clearing that up! That makes a lot more sense.<br><br>Thanks,<br>Patrick
     
  9. trobbie66

    trobbie66 New Member

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    <div>so do I understand this right? acceleration is a product of band length ie a 12 inch band has twice the accel. of a 6 inch. It is a product of total draw length and not the ratio of the rubber?</div><div class="clear"></div><div class="signature_div">
    <br>Trobbie66 <img src="http://illiweb.com/fa/i/smiles/icon_cheers.png" alt="cheers" longdesc="28">
    </div>