More high tech band research!

Discussion in 'General Slingshot Discussions' started by JoergS, Jan 5, 2012.

  1. JoergS

    JoergS Administrator

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    <br><br><br><br><br>It is a known fact that slingshot bands convert thermical energy into kinetic energy. If you draw out a band and touch it with your upper lip, you can FEEL it is warm. After the shot, the bands return to normal temperatures.<br><br>Physically, the heat is generated by inner friction, but also drawn from the environment (air). When the shot falls, this heat is at least in part given back to the environment.<br><br>In order to visualize this effect, I have booked two days with a very expensive thermographic camera, the Jenoptic Varioscan 3021 ST.<br><br>Here is the data sheet of the device:<br><br><a href="http://www.deplan.gr/download/varioscan_englisch.pdf" class="postlink" target="_blank" rel="nofollow">Check out the pdf file</a><br><br>The precision is a fraction of a centigrade (0.03 Kelvin), resolution is 360x240. This should be good enough to show the effect. Of course, I will use it on tubes, tapered and non tapered flats.<br><br>Can't wait! Camera is supposed to arrive on the 14th of January.
     
  2. horstel-1980

    horstel-1980 New Member

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    Great idea, but the bands do not convert thermical (thermal?) energy into kinetic energy. The shooter, when he draws out the slingshot, stores energy in the rubber, but some part of this energy is converted to heat. <br>when the pouch is released, the energy is converted to kinetic and again thermal energy. <br>My theory is, that when you shoot a slingshot, the temperature of the rubber will drop every shoot (to a certain level), because when you draw out, the rubber is so thin, that it cools down very fast, and during the shot the rubber is cooled by the "wind".
     

  3. JoergS

    JoergS Administrator

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    Well, I will certainly talk to my brother (who is a physicist) about this some more, and also consult some cool books on the subject. But I am very much looking forward seeing what actually happens. Don't you?
     
  4. horstel-1980

    horstel-1980 New Member

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    I am! It will be interesting to see, at which temperatures some bandset will preforms best. Will you test with your "band-preheat" slingshot?
     
  5. JoergS

    JoergS Administrator

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    I will certainly heat up bands with a hot air gun.
     
  6. SkauneJohan

    SkauneJohan Member

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    very interesting, I am looking forward very much for the result <img src="http://illiweb.com/fa/i/smiles/icon_cheers.png" alt="cheers" longdesc="28"> you are the BEST Jørg!