Sneak preview: Forearm mounted crossbow

Discussion in 'Show off your homemades!' started by JoergS, Apr 22, 2012.

  1. JoergS

    JoergS Administrator

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    In about two weeks, German TV will come visiting. They want to include me in a show "People with crazy hobbies". Great coverage!<br><br>Of course they want something special that I haven't shown in an earlier video. So I pulled out my list of potential projects and settled for the concealable forearm mounted crossbow. <br><br>Of course I used rubber as the propellant, simply because a normal prod would be way to wide, never concealable. But of course the length of a forearm mounted weapon is short, I needed a draw increase so that the full power stroke is active. So rollers, again. <br><br>10 cm of rubber is stretched to the total span of 52 cm! Nice. <br><br>I wanted to make this mostly from wood. I even made a spring from plywood, so the bolt is held in place! Works like a charm. There is so little metal in the piece that I believe metal detectors would have a hard time finding it. <br><br>I wanted to be able to reload without dismounting the weapon, so I came up with a "fork". This little tool makes reloading quick and easy. <br><br>The trigger part is simply a length of paracord that runs underneath the string. If you pull on a knot by flipping your hand down, it shoots! Simple and effective. <br><br>I haven't started on the "beauty" task, and also I haven't maxed out the rubber. But it is really really fun to shoot with it, and it is fully concealable under my <br><br><img src="http://img819.imageshack.us/img819/4465/armshooter1.jpg" border="0" alt=""><br><img src="http://img641.imageshack.us/img641/6720/armshooter3.jpg" border="0" alt=""><br><img src="http://img821.imageshack.us/img821/2276/armshooter2.jpg" border="0" alt=""><br><img src="http://img28.imageshack.us/img28/2410/armshooter4.jpg" border="0" alt=""><br><img src="http://img23.imageshack.us/img23/1958/armshooter5.jpg" border="0" alt=""><br><img src="http://img171.imageshack.us/img171/9281/armshooter6.jpg" border="0" alt="">
     
  2. onnod

    onnod Im from Holland, isnt that weird?

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    Looks too damn cool, i want it now!!!
     

  3. tokSick

    tokSick Senior Member

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    That' s just great, i can' t find the words to tell you what i think about that thing. But i know why you don' t have hairs... your brain is constantly in activity and it makes them burn <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><font face="Arial"><strong>.<br></strong></font>
     
  4. Alukuchen

    Alukuchen Senior Member

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    Wonderful! So tiny and compact! You don't mind if I copy it? I LOVE that little crossbow! It is so cute but so devius and lethal <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1"> nothing else to say, one of the best things i've ever seen <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
     
  5. kooniu

    kooniu New Member

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    great idea! This idea comes behind me from years, since I watched Mad Max 2 - Make sure as shooting film!
     
  6. Ryan Wigglesworth

    Ryan Wigglesworth Senior Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Alukuchen1992 wrote:</b></span></td></tr>
    <tr><td class="quote">Wonderful! So tiny and compact! You don't mind if I copy it? I LOVE that little crossbow! It is so cute but so devius and lethal <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1"> nothing else to say, one of the best things i've ever seen <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
    </td></tr>
    </table>
    <span class="postbody"><br><br>Joerg has almost always encouraged people to copy his designs, I can only think of a few times he says " don't try this at home" <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1"></span>
     
  7. cbsmith111

    cbsmith111 New Member

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    This is awesome! I mean all of your crossbows are awesome, but this one has the potential to be much more practical to employ than some of the others. In my opinion this is probably one of your most useful weapon designs to date. Especially since it could be concealed under a loose sleeve and shot without ever being revealed.
     
  8. JoergS

    JoergS Administrator

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Alukuchen1992 wrote:</b></span></td></tr>
    <tr><td class="quote">You don't mind if I copy it? </td></tr>
    </table>
    <span class="postbody"><br><br>Sure, go right ahead! It is actually quite simple.</span>
     
  9. Pikeman

    Pikeman New Member

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    This is a really cool idea. It reminds me of De Niro's quick draw gadget in Taxi Driver.
     
  10. zamarion

    zamarion New Member

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    thats actually really similar to the forearm mounted slingshot design that i emailed you joerg <img src="http://illiweb.com/fa/i/smiles/icon_razz.gif" alt="Razz" longdesc="9">
     
  11. JoergS

    JoergS Administrator

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    Zamarion, true, same concept! But of course this is an arrow shooter, plus your design would have to be loaded in dismounted condition (or by a second person).
     
  12. zamarion

    zamarion New Member

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    yeah my design was a bit primitive <img src="http://illiweb.com/fa/i/smiles/icon_razz.gif" alt="Razz" longdesc="9"> and i cant realy draw concepts like that so my drawing was a bit crappy and yes it was designed to load while dismounted and then pull the rubber back and lock it with your roll lock system
     
  13. Earth 2

    Earth 2 New Member

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    Wow that's insane Joerg! <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1">
     
  14. Joerg,<br><br>Just wondering... The tubing you are using. Thera-Band green tubular????<br><br>I only ask because I know you use Thera-Band but normally gold.<br><br>And just in case some of you feel like sending 'funny' comments, NO I'm not colour blind, YES I know it is <font color="green">GREEN</font> but the question is mainly, is it Thera-Band? <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15"><br><br>Thanks
     
  15. JoergS

    JoergS Administrator

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    Yes, TB green. <br><br>I can probably go up to blue, but that is about the max this little thing can handle. The rollers aren't large enough for black. <br><br>Gold only comes as flat band, and these rollers don't handle flats well. <br><br>This simply is a fun shooter, certainly not made for max power. <br><br>BTW, I worked on it a bit!<br><br><img src="http://img542.imageshack.us/img542/3931/armshooter7.jpg" border="0" alt="">
     
  16. That looks sooo cool Joerg,<br><br>Just a thought, your little cocking 'fork' device I noticed is a 'push' type setup, wouldn't it be quicker and easier to make it work with a pulling motion instead?<br><br>I am currently in the process of getting together all the pieces (rifle stock, metal tube, nuts, bolts etc etc etc) to make a home made crossbow complete with prod and all, but after seeing this, I've decided to do away with the prod and have a roller setup instead. Way less bulky than the prod.<br><br>I liked your little fork contraption but I think a pull up type would be easier than a push up type.<br><br>Then again, I am only half your size and can't bench press a VW front end like you probably can. LMAO<br><br>Will post some pics when I have completed it.<br><br><br><br>Spoons
     
  17. JoergS

    JoergS Administrator

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    A puller would work as well, but you'd have to stretch out the arm in order to do that while the weapon is mounted to the forearm. The pusher works really well.<br><br>For conventional hand held crossbows, yes, a pull up device works better.
     
  18. zamarion

    zamarion New Member

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    wow it turned out even nicer <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
     
  19. JoergS

    JoergS Administrator

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    Will now replace the rubber band attachment for the trigger part (two nails, quite ugly), and then the thing is pretty much finsihed!
     
  20. pelleteer

    pelleteer Middle Aged Delinquent

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    Sweet! That reminds me of the forearm mounted shotgun in the 80s movie <i>The Soldier</i>. Skip to about 4:20 in this vid:<br><br><a href="http://www.youtube.com/watch?v=D7mqZbFDyBg&feature=relmfu" class="postlink" target="_blank" rel="nofollow">http://www.youtube.com/watch?v=D7mqZbFDyBg&feature=relmfu</a>