Saturday, October 29, 2011

Thera Band Gold calculator: Online!

I wrote the algorythm (in Commodore BASIC, the only programming language I ever learned), my brother Hartmut converted it into a java script, and Thomas Kole implemented it into my web site...

Here it is:

Check it out on my homepage!

It will probably take some for fine tuning, but in the end it should be just perfect.
Posted by The Slingshot Channel at 5:05 PM

24 comments:

  1. Tosh TogoOctober 29, 2011 at 6:01 PM

    Oh no! I gotta think in metric? Horrors and woe upon me! :)
    Excellent calculator Joerg. Thank you very much for doing this for us.

    ReplyDelete
  2. maddymax0001October 29, 2011 at 8:17 PM

    WOAHHH!!! thank you so much for that. it works great. if i was female, i'd ask you to marry me. thanx a lot. :-)

    ReplyDelete
  3. Judd LantzOctober 29, 2011 at 9:51 PM

    This is one of the greatest tools a slingshot shooter could have. The will most definitely help me and others around the world with band set-up. THANK YOU Joerg for these calculations, they are greatly appreciated

    ReplyDelete
  4. Rational RootOctober 29, 2011 at 10:21 PM

    Just got a catapult from rkcatapult. Your band calculator suggests that double 20cm bands, tapered from 25mm to 20mm is way overpowered for shooting 10mm steel for targets. I already took it down to single bands.
    For a 90cm draw, and choosing 6 & 6 (middle of the road) your calculator shows getting a ~ 23cm bands, tapered ~1.3cm to 0.7.
    (I can't see the difference between 0.7 and 0.64 mm, so I sure can't cut that accurately ;-)
    I seems that unless I put in 14mm lead, double theraband gold 25mm->20mm is crazy overkill...

    ReplyDelete
    Replies
    1. AnonymousJuly 23, 2012 at 9:36 PM

      I used the calculator my first time, then used the length it gave me which was 27.56cm at a draw of 80cm I think, I forgot the the width and did 3cm tapered down to 2cm it is powerful and I can not pull it out to full draw because I've lost about 5cm on the pouch and forks. I've not found any over kill with 12mm steel ball bearings however it obliterates pigeons.

      Delete
  5. UnknownOctober 30, 2011 at 12:36 AM

    Cool, this will come in handy!

    ReplyDelete
  6. The Slingshot ChannelOctober 30, 2011 at 4:09 AM

    Rational Root, yes, those original bands are good for heavy lead ammo, 10 mm steel is pretty light.

    The original bands would also give you a terrible handslap when you shoot 10 mm.

    ReplyDelete
  7. TobseOctober 30, 2011 at 12:08 PM

    i test the calculator, there was too little rubber and too little stretching for me, maybe this was made for beginners :-)

    ReplyDelete
  8. The Slingshot ChannelOctober 30, 2011 at 12:41 PM

    Tobias, yes, the calculator is aimed at the average user, not the world record keeper...

    Seriously, I may have to change the algorythm for the "extreme" settings. Currently, I use a max,. stretch of 5,5 and 600 gramms of draw weight per gramm of bullet weight. So a 30 gramm ball would need 18 kg draw.

    ReplyDelete
  9. TobseOctober 30, 2011 at 1:35 PM

    yes, this change is necessary because number 9 = max power.

    i´m use 900g draw weight per gramm of bullet weight
    with 16mm steel
    and 1400g for 12mm steel
    for the big ball are 600gramms OK.

    ReplyDelete
  10. Tosh TogoOctober 30, 2011 at 2:00 PM

    Nice to see both experts (Tobias and yourself) agree in principle for an 'extreme' setting. Since many of your fans want to follow you in this path of 'more power', a guide or formula to achieve (or at least just try to achieve) this would be very much appreciated. Since you mentioned your calculator would need possible 'tweaking', I submit my request for this 'extreme' setting with an already existing appreciation for what you have already done with the calculator. Thank you again for the calculator.

    ReplyDelete
  11. Rational RootOctober 30, 2011 at 9:33 PM

    Thanks for the reply, I've taken the RK down to Single bands, and ordered some Theraband Gold to make up my own bands. I'm over 190cm tall, so even anchoring at my chin give me a 90cm draw. Right now, until I can hit things smaller than a wall, power does not matter much.

    ReplyDelete
  12. FrédéricOctober 30, 2011 at 11:23 PM

    Your my favorite yoda Jörg!
    Greetz aus deinem Heimatland

    ReplyDelete
  13. Kylie Sven O'possumOctober 31, 2011 at 12:37 PM

    Thanks Joerg, This is really handy. I, also am interested in the extreme setting. All the way to 11.

    ReplyDelete
  14. ItamarNovember 1, 2011 at 10:16 PM

    WOOOOOOOOOOOOOOOHOOOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!! I've been waiting for this ever since u mentioned it on the old forum :)

    ReplyDelete
  15. AnonymousDecember 19, 2012 at 10:17 PM

    Hey all I want to buy some Thera band Gold but do not want to buy it from feebay.Where is the best least expensive place to buy it? Already got a nice black HDPE (high-density polyethylene sling/catapult from fee bay.
    eric_botts@yahoo.com

    ReplyDelete
  16. Terry A. MasriJuly 22, 2013 at 5:42 PM

    This comment has been removed by the author.

    ReplyDelete
  17. UnknownJuly 22, 2013 at 5:51 PM

    Just getting ready to test the calculator. However, I don’t have access to Theraband Gold where I live (it’s complicated)! The best I can manage is a blue DOMYOS “Fit Band” rated at 10kg/22lbs (not sure how that’s measured). Here’s the website: http://www.decathlon.co.uk/fit-band-id_8212968.html#avantages
    Anywho, I would like to see another variable added to your calculator where the rubber type/draw-weight/gauge can be taken into account. Too bad it’s limited to ONLY one type of rubber, the Theraband Gold (too limited for real world application).

    ReplyDelete
  18. AnonymousJuly 24, 2013 at 9:34 AM

    Hi Joerg,
    On what do you base your 0,6 kg per gram bullet weight?

    Cheers,

    Adrian.

    ReplyDelete
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  22. Michael ShparberMay 11, 2016 at 1:15 PM

    does the length in the results include some spare space for tying? or should i just cut what it says?

    ReplyDelete
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