James Bond's Slingshot

Discussion in 'Show off your homemades!' started by JoergS, Nov 4, 2012.

  1. tokSick

    tokSick Senior Member

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    So i will go for the magnum version maybe. Hope it is not too difficult to build. Thank you.
     
  2. JoergS

    JoergS Administrator

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    Not very hard to build. The only challenge is to saw out the slot, must be very straight. Go easy on the saw. <br><br>
     

  3. TheSurvivalist

    TheSurvivalist New Member

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    could you shoot pencils out of it? cheap ammo!!!!
     
  4. JoergS

    JoergS Administrator

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    Thin pencils maybe. But the range is limited, plus the pencils break easily. And these arrows only cost about 50 cents each, can be reused quite often. In the end the arrows may be cheaper per shot.
     
  5. DrDoomic

    DrDoomic New Member

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    Good job, Jörg! Very neat as always, my tip would be to remove the screw-nuts from the heavy metal bolt, and maybe drill a hole in the rod and then glue the other sharp rod in to it, increasing the penetration. <br>I have no idea if it works though, I don't have much experience in metal and glue combined. But I'm just an amateur, you probably know better.<br>Anyway, very nice!
     
  6. slingpit

    slingpit Slingshot addicted

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    Very nice work and so powerful.<br>I´m surprised what is able to to with so short bands.
     
  7. tokSick

    tokSick Senior Member

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    Sure you will save a lot of rubber bands/tubes with that one.
     
  8. CEZ

    CEZ New Member

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    Would it make sense to make the compact version with a bit longer barrel so that it has more draw length? I'm thinking of something about 30cm in total.
     
  9. JoergS

    JoergS Administrator

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    Sure, the more draw length, the more power. But keep in mind that the loading rod has to be stabilized with additional "ladder steps" then, otherwise it will bend to the outsides. <br><br>The two factors that define the power of a rubber based weapon are draw weight and draw length. These short pistols have to have a lot of draw weight to achieve serious arrow speeds. <br><br>Once you get near to the terminal retraction speed of the rubber type you use, neither draw weight nor draw length increase will help. With the double TTS bands, this is what happened. It does about 60 m/s. You won't ever see TTS shoot faster than that.<br><br>A longer pistol could achieve 60 m/s with much lighter bands. Or you could switch to tapered TBG. Then you could achieve much higher projectile speed, up to about 80 m/s or so.
     
  10. Theodor

    Theodor New Member

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    Cool video I really like both pistols!<br>They automatically entered my todo list! <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>the bullpup version resembles the luger design I think...
     
  11. JoergS

    JoergS Administrator

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    Looks a bit more like the Borchardt C93 - a forerunner of the P08, in fact.<br><br><img src="http://historywarsweapons.com/wp-content/uploads/image/Borchardt_C93.jpg" border="0" alt="">
     
  12. Theodor

    Theodor New Member

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    Indeed that looks much more like it! <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15">
     
  13. poudreverte

    poudreverte New Member

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    <div>Hi Joerg,<br><br>I have a question : You told that your magnum pistol actually shoots as hard as the commercially made crossbow pistol (I have the same as you can see in my previous message) - but it is much smaller... I wonder if you tried to attach a "thera tube set" on the commercial crossbow before building your own pistol. It looks very easy to do, and it could make a good comparison of power of both systems. plus we can use the original reloading lever of the commercial version. What do you think ?<br><br>May be I'll try to replace the bow with tubes to test it soon !</div><div class="clear"></div><div class="signature_div">
    <br>Love shooting <img src="http://illiweb.com/fa/i/smiles/icon_tongue.png" alt="tongue" longdesc="24">
    </div>
     
  14. JoergS

    JoergS Administrator

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    The problem is that the "fork" of the commercial crossbow is very wide. This means that it would take an enormous amount if rubber to get to the same draw weight. We are talking speargun rubber.<br><br>The more narrow the fork, the harder the draw, the more powerful the shot.
     
  15. poudreverte

    poudreverte New Member

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    <div>Do you mean that to achieve the same speed of the arrow with rubber the strenght for reloading it must be bigger than with the original bow ?<br><br>May be there is a misunderstanding in my question : I mean to remove the bow and attach rubber on a narrow fork built on the commercial crossbow...</div><div class="clear"></div><div class="signature_div">
    <br>Love shooting <img src="http://illiweb.com/fa/i/smiles/icon_tongue.png" alt="tongue" longdesc="24">
    </div>
     
  16. JoergS

    JoergS Administrator

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    OK, if you remove the bow and put a narrow fork on instead, this may work.
     
  17. DrDoomic

    DrDoomic New Member

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    According to theory, wouldn't the sling-pistols handle to fire a steel ball with the same diameter as the arrows? Of course the string may have to be replaced with a pouch or a really thick string. (But maybe the firing mechanism doesen't work when shooting steel balls.)<br><br>Anyway, that's just an idea and maybe you would like to try it out? <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15"><br><br>Regards.
     
  18. JoergS

    JoergS Administrator

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    Steel balls are very slippery, and wooden barrels have some flexibility. The steel balls have intertia, and do offer resitance to the string. When the force gets too high, the string can jump over the ball and the weapon misfires. Not dangerous, but ineffective. <br><br>A pouch works better, but pouches may twist in the tight slot, plus they have to very narrow. In general, slotted barrels are good for arrows, balls are better suited for a "clamp lock" and free flight through the fork (like my sniper sling-x-bow mechanism).
     
  19. HowardAshenfelter

    HowardAshenfelter New Member

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    Hi Joerg, Great designs! I'm going to try them both next spring when I re-open my wood shop.<br><br> I have just one question. What was the scale of the graph paper you used for the blueprint of the "mini"? I'm guessing 6mm x 6mm.