At last: Real life comparison between inner tubing, office rubber and TB Gold

Discussion in 'General Slingshot Discussions' started by JoergS, Sep 17, 2011.

  1. JoergS

    JoergS Administrator

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    Rubber related questions are MOST common. People often want to know if they can use bike inner tubing or office rubber, as they often can not find Thera Band. Here, a test is conducted. 6kg (12 lbs) draw weight and 85cm (33") of draw length is what everybody can draw with ease, even teenage boys. So three different bands were made that match these criteria, one from inner tubing, one from office rubber, one from Thera Band Gold. <br><br>The video about the tests will be online shortly, but here is the complete chart:<br><br><img src="http://img90.imageshack.us/img90/993/rubbertable.jpg" border="0" alt="">
     
  2. tayloriand

    tayloriand New Member

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    The figures for the 8mm and 15mm ball are very interesting.<br><br>As with airgun pellets there is a trade off with power, weight of projectile, trajectory, stopping power, etc<br><br>I'd be interested in a test with the same band and several sizes of steel and lead balls.
     

  3. DukaThe

    DukaThe New Member

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    I used Inner Tubing before but I had no results at all <img src="http://illiweb.com/fa/i/smiles/icon_sad.gif" alt="Sad" longdesc="3"> Yes, its true. I never made a bandset couse I couldnt cut it straight. Now I use TB God, Silver and Black and I am happy <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>P.S.<br>Joerg, can you help me? I want to make a bandset from TB Black for plinking and target shooting (but not to strong, not butterfly style) for my homemade slingshots and for my Dankung Owl and Dankung Agile Toucan. I need to know dimensions for how to cut it. Can you please elp me?<br>Thanks <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
     
  4. JoergS

    JoergS Administrator

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    Duka, what kind of ammo do you want to shoot? How long is your desired draw? For how many shots do you want your bands to live? Remember the faster the bands, the shorter the lifespan.
     
  5. JoergS

    JoergS Administrator

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    <embed pluginspage="http://www.macromedia.com/go/getflashplayer" src="http://www.youtube.com/v/S7ct_n1HVqM" width="425" height="350" type="application/x-shockwave-flash" wmode="transparent" quality="high" scale="exactfit"></embed>
     
  6. DukaThe

    DukaThe New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>JoergS wrote:</b></span></td></tr>
    <tr><td class="quote">Duka, what kind of ammo do you want to shoot? How long is your desired draw? For how many shots do you want your bands to live? Remember the faster the bands, the shorter the lifespan.</td></tr>
    </table>
    <span class="postbody"><br>I will shoot regular glass marbles (dont know dimensions), I like to draw to corner of my mouth (thats about 75 cm) and the life of the bands is not that inportant but it will be nice to long for some time <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>Can you help me?</span>
     
  7. Antraxx

    Antraxx #7

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    hmm sorry, maybe a bit too much of nitpicking from me (maybe i´m wrong), but those numbers of joule and ft./sec are very precise, on the other hand, the pulling...well it´s just "your arms" as measure. <br><br><br><br>That last shot of your crossbow sounds really really powerful <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1">
     
  8. JoergS

    JoergS Administrator

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    antraxx, not so, I do have a set of digital scales. The draw weight of these slingshot bands are very close to each other (5% tolerance maybe). <br><br>It is a bit hard to say as towards the end of the stretch, the draw weight increases steeply until the bands tear. You have to find that spot right at the end of the stretch.
     
  9. JoergS

    JoergS Administrator

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>DukaThe wrote:</b></span></td></tr>
    <tr><td class="quote">I will shoot regular glass marbles (dont know dimensions), I like to draw to corner of my mouth (thats about 75 cm) and the life of the bands is not that inportant but it will be nice to long for some time <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>Can you help me?</td></tr>
    </table>
    <span class="postbody"><br><br>Duka, I recommend cutting them 21cm x 2,8cm (fork) x 1,8cm (pouch), 2 bands per side. You will loose about three cm for the attachments. <br><br>At your 75 cm draw, the bands will only be stretched to 400%, this will give you good band life.<br><br>Good luck!</span>
     
  10. Antraxx

    Antraxx #7

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    ok, you always stretched them to the max, i thought you always guessed those listed drawweights.
     
  11. Cuthbert Allgood

    Cuthbert Allgood New Member

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    very informative video. I gotta stock up on theraband lol.
     
  12. charlesgmorgan

    charlesgmorgan New Member

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    I really appreciate this kind of test. It makes it easier to make decisions about what sort of bands one will use. I was pleasantly surprised at the bicycle tube result. I would not have thought they would do so well.<br><br><br><br>It would be interesting to see similar comparisons of the various types of theraband ... for example, would two layers of black yield similar results to one layer of gold?<br><br><br><br>Cheers ..... Charles
     
  13. JoergS

    JoergS Administrator

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    Got a great tip from a friendly youtuber today. He says that the rubber used for the inner tubing I tested (called Butyl) is inferior to Latex inner tubing, now available for high performance bikes. It is lighter and stretchier than Butyl.<br><br>Now we are talking! Ordered a few of those inner tubings today on ebay. I may have found a true alternative to Thera Band.
     
  14. Јузер Нејм

    Јузер Нејм New Member

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    Could it be new powersource for future slingslots?<br>What is the price for it?<br>Cheerz
     
  15. Oldschool

    Oldschool New Member

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    Joerg, I used to work as a Gym Teacher and one of those oversized 4 foot wide volleyballs exploded in class. The students brought me the bladder that they found inside the outer cover. It was and has been an excellent source of very stretchy and strong rubber. the down side is the shape but I have a made a couple sets from it.
     
  16. Ryan Wigglesworth

    Ryan Wigglesworth Senior Member

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    Hmmm, you all just made me consider balloons .... interesting... you know those big ones that you put seeds and stuff in and bounce around... I wonder...
     
  17. andreas

    andreas New Member

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    I am not surprised about the inner tube. I've tried it and it has a plastic feel to it. (plastic is probably not the right translation, but I mean that it feels like it wants to stay in stretched position)<br><br>The most common officerubber / postal elastics in the Netherlands are have a yellow/golden color just as the theraband, not red. It is also a bit translucent, so that suggests to me it could be of natural rubber and therefore better than there ones.<br>It works fine for shooting. But I can't compare it to theraband.
     
  18. DanielBenford

    DanielBenford New Member

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    Ok this may be an unusual question but has anyone tried using medical rubber tourniquets, do they have enough tensile strength?
     
  19. smoke

    smoke New Member

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    I am new to this and this may be a dumb question, but what is a joule?
     
  20. John S

    John S New Member

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    Unit of energy, a watt x second. Its calculated using a formula based on how fast a given weight is moving.