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9" nails as ammo: New slingshot pumpgun!

Discussion in 'Non-Firearm Weapons' started by JoergS, Dec 24, 2012.

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  1. JoergS

    JoergS Member

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    Here is my latest work... a repeating slingshot crossbow, shooting 9 inch nails.

    This is in continuance with my Chu-Ko-Nu based design line. This time, it is bigger than the pencil shooter, but a lot smaller than the chest mounted spear launcher.

    [​IMG]

    The ammo is - nine inch (23 cm) nails. Those are cheap, about 8 Euro-cents a pop (10 Euros for 120 of them). Of course you have to cut of the head, done in about one minute.

    [​IMG]

    The repeating action is done by pressing the butt against the chest and pulling back with both arms, like in a rowing machine. This is needed as you need a lot of draw force to throw the heavy nails - each weighs 76 gramms (1276 gr). The magazine fits ten of them.

    [​IMG]

    With a bit of extra effort, you can very easily enhance the tip by sharpening it. I even hardened the tip of this one.

    [​IMG]

    It works great. I may add more rubber soon, but already this is very effective. Like a Chu-Ko-Nu, but more compact and with a trigger!

    Here is the video:

    http://www.youtube.com/watch?v=95Xm-YT4FZ0
     
  2. JShirley

    JShirley Administrator Staff Member

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    Neat. Wondering how far they'll go accurately.

    John
     
  3. heron

    heron Member

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    Looks like you've reinvented the Chinese repeating crossbow. I'm always delighted at your inventiveness.
     
  4. bikerdoc

    bikerdoc Moderator Staff Member

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    Intriguing idea.
     
  5. sawdeanz

    sawdeanz Member

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    Looks like a lot of fun!
     
  6. snakeman

    snakeman Member

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    Sweet!
     
  7. Mauser lover

    Mauser lover Member

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    Wow, rubber band gun of doom...
    What do you plan to use this on? Is this some kind of firearm replacement for someone who lives somewhere it isn't possible to get a firearm?
    If so... Looks like it would be a good replacement!
     
  8. Centurian22

    Centurian22 Member

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    Very interesting! I also am interested in the accuracy and range of it?
     
  9. JoergS

    JoergS Member

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    Here is the video - sorry for the indoor filming, lots of rain.

    http://www.youtube.com/watch?v=95Xm-YT4FZ0

    The weapon is very good for distances up to 15 ft - then the nails will start to tumble. If you use front heavy bolts (wooden, aluminum or carbon shaft, steel tip), then the effective range is more like 20 yards.

    I think this makes a good self defense weapon, much quicker reloading vs. a single shot crossbow and very intimidating. One hit with a nail in the belly, and a burglar/attacker wants a doctor more than anything else in the world :)
     
  10. possom813

    possom813 Member

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    JoergS, that is about the neatest thing I've seen in a while.

    I hope you don't mine if I share your video on facebook.



    Also, what are the bands that you are using for this nail gun? I still have a few weeks before school actually starts, and I'd like to attempt something like this to shoot in the backyard.
     
  11. thepumpfaction

    thepumpfaction Member

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    I saw this vid! I subscribed to you on youtube. I'm a huge fan! You build some amazing things.
     
  12. JoergS

    JoergS Member

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    Go right ahead an post it on facebook, that's fine with me.

    I used Thera Band Gold, 6cm x 13cm, two bands per side (looped). Since the video was shot, I added another identical band in Thera Band Blue, effectively making the bands 30% stronger. This is pretty much the limit of the material (wood is groaning under strain already).
     
  13. XDJ

    XDJ Member

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    It's a good thing it only holds ten "bolts" because we all know that 11 would just be too dangerous.

    I love your videos and slingshots. Keep them coming.
     
  14. Dr. Sandman

    Dr. Sandman Member

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    You should submit this idea to industry. There are many people out there who would buy this.
     
  15. 19-3Ben

    19-3Ben Member

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    Trent Reznor could make a fortune selling them!!!!
     
  16. 19-3Ben

    19-3Ben Member

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    Might there be a way to add fins to the back, like an arrow to help stabilize for longer range?
     
  17. USAF_Vet

    USAF_Vet Member

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    As always, I love your stuff.

    Could you put your patterns in a PDF format for download so we can try making our own?
     
  18. JoergS

    JoergS Member

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    The dimensions of the weapon depend very much on the size of the nails. A pattern would really only work if you use the exact same nails I have. It is not likely that this will be the case.

    The weapon is very easy to understand, though. Only two moving parts - the trigger/sear and the slide.

    As I said in the video, fins aren't the key to a stable flight. Front heaviness is. Fins are important for bows, as they are needed to overcome the archer's paradox (the arrows wobble after the shot). For a weapon like this, there is no such effect as the acceleration is very linear.
     
  19. 7mmstalker

    7mmstalker Member

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    Very good engineering, an effective weapon built from common materials, using basic skills.
    Joerg, my compliments, true strength of intellect and inventiveness.
     
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