Band Calc more precise

Discussion in 'General Slingshot Discussions' started by otta88sun, Jan 20, 2013.

  1. otta88sun

    otta88sun New Member

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    In my new website i just added a section for sling shot.<br>I used original Jorg Calc but i add 2 parameters<br><br><a href="http://www.airgunforge.com/slingshot-band-lenghtwidth-calculator/" target="_blank" rel="nofollow">http://www.airgunforge.com/slingshot-band-lenghtwidth-calculator/</a><br><br>the parameters interest the pouch weight and the bands lenght to fix the bands at pouch and at fork
     
  2. tokSick

    tokSick Senior Member

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    Hi Otta<br>I think Joerg' s bands calculator already include the attachment...I am not sure but if so, adding 2cm will just weaken the performance.
     

  3. otta88sun

    otta88sun New Member

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    hi, i dont' think that adding 2 cm will weak perfomance because if the cm are fixed they wont elongate so there isn't less power in performance.. i tested it with chrony...
     
  4. tokSick

    tokSick Senior Member

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    Oh, ok... I thought if adding 2 more cm would less the performance for the same draw lenght. I am really not good in calculating/understanding those things <img src="http://illiweb.com/fa/i/smiles/icon_redface.gif" alt="Embarassed" longdesc="10">
     
  5. otta88sun

    otta88sun New Member

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    yes, if u add 2 cm at same draw lenght u get less perfomarce... this is a rule XD<br>but the 2 cm added are used for fixing the bands, so the total lenght visible is the same.<br><br>this coz joerg calc (i think) don't calculate the cm needed to fix the bands at fork or at pouch...<br><br>i'll do some studies, you can keep u update on <a href="http://www.airgunforge.com" target="_blank" rel="nofollow">www.airgunforge.com</a> , but i think i'll post here too.
     
  6. JoergS

    JoergS Administrator

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>tokSick wrote:</b></span></td></tr>
    <tr><td class="quote">Hi Otta<br>I think Joerg' s bands calculator already include the attachment...I am not sure but if so, adding 2cm will just weaken the performance.</td></tr>
    </table>
    <span class="postbody"><br><br>+1</span>
     
  7. otta88sun

    otta88sun New Member

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    Let me be more "precise".<br>I calculated a drawlenght of 100cm and a stretch factor of 4x (the best for performance/bands life) (don't care about tapering, it's just for illustration)<br><br>here 2 example that shows Joerg Calc is not correct at all<br><br><a href="http://www.servimg.com/image_preview.php?i=11&u=17945044" class="postlink" target="_blank" rel="nofollow"><img src="http://i14.servimg.com/u/f14/17/94/50/44/altern10.png" border="0" alt=""></a><br><br><a href="http://www.servimg.com/image_preview.php?i=12&u=17945044" class="postlink" target="_blank" rel="nofollow"><img src="http://i14.servimg.com/u/f14/17/94/50/44/altern11.png" border="0" alt=""></a><br><br>I don't wanna flame anyone but after my test (with chrony too) i realized that there is no correct calc in band lenght for the fix at pouch and at fork.