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I suppose spud guns are firearms, right?

Discussion in 'General Gun Discussions' started by zahc, Jul 6, 2006.

  1. zahc

    zahc Well-Known Member

    For the basic aquanet cannon with a 1.5" barrel, what volume ratio do you want to have between the fuel chamber and the barrel? I seem to remember being told a rule of thumb, but I don't remember what it is.

    PVC or ABS?
  2. Bruce333

    Bruce333 Well-Known Member

    The chamber should be 1.5 times the volume of the barrel

    # Volume = Pi x radius sq. x length--(in inches)
    # Example: 12" piece of 4" ID pipe.
    # 3.14 x 2 x 2 x 12 = 150.72 cubic inches of volume

    Schedule 40 PVC
  3. redneckrepairs

    redneckrepairs Well-Known Member

    If I understand correctly a " spud cannon " can go from a hobby to an Any Other". classification quickly depending if and to whom it comes to notice to in the atf structure LOL . but for only research uses ( not to build ) the previous posters have covered it imho
  4. nainc

    nainc Well-Known Member

    Don't hurt yourself!

    I made several with 12" PVC combustion chamber (3" dia.), necked down to a 36" barrel (1.5" dia.). The hardest thing to do is to wait 24 hours for the PVC cement to cure! Make sure you do it though! Otherwise you risk eating pipe fragments! Have fun!
  5. Deer Hunter

    Deer Hunter Well-Known Member

    My dad's old 'tater gun has a huge tube on it. I think it's a 4 caliber, hehe. It's a 4" tube that's around 6 feet long. I don't know how to make them, but he did kill a squirrel once with it.
  6. Bruce333

    Bruce333 Well-Known Member

    I think he meant as far as posting here on THR (ie keeping things firearms related)but...as long as you only launch potatoes you shouldn't have a problem...(bold emphisis added by me)

  7. nainc

    nainc Well-Known Member

    Since it's getting to be later on in the summer, I feel it's only my duty to mention that fresh corn on the cob (without the husk, of course) also makes for AWESOME launching from the 1.5" barrel.:evil:
  8. sm

    sm member

  9. Soybomb

    Soybomb Well-Known Member

    When spud guns are outlawed....

  10. GregGry

    GregGry Well-Known Member

    Just don't go making spud warheads that detonate on impact, and you will be fine :D
  11. Kevlarman

    Kevlarman Well-Known Member

    You mean like a small prescription bottle filled with a bit of gunpowder and topped with a primer? :evil:

    I could never get my combustion spudguns to light reliably every time, but I've had great success with pneumatic models.

    ABTOMAT Well-Known Member

    Regardless of how many folks do it, do _not_ use PVC for something like this. It grows more brittle every time it's subjected to shock, pressure, many chemicals, and cold weather. Same reason it's not allowed to be used for air lines in shops or factories. Instant frag grenade.

    By the way, skip the Aqua-Net and just use the propellant. Much less messy. IIRC it's either butane or propane.

    But the best spud guns are compressed air.
  13. cassandrasdaddy

    cassandrasdaddy Well-Known Member

    mapp gas and schedule 80 pipe

    i blew up my schedule 40 cannon am gonna go schedule 80
    i've used propane and mapp gas use stun gun igniter works great but i'm guilty of overkill. 5 foot long six inch cha,mer 10 foot 2 inch barrel kinda like shooting plus p's from a deringer but fun to watch
  14. Hooligan

    Hooligan Active Member

    Schedule 40 PVC should be fine, as long as it has a pressure (PSI) rating printed on it. I used schedule 40 for a mean little propane spud gun I made as part of a college project :evil:

    As far as the ratios go, you want a 1:1 to 1.5:1 combustion chamber to barrel ratio. You should be safe with that.

    ABTOMAT Well-Known Member

    The pressure ratings are water pressure. I'm not kidding, people have been killed by exploding PVC pipe. Even the heavy stuff.
  16. Kevlarman

    Kevlarman Well-Known Member

    Almost everybody uses PVC to make their spud guns.

    It's cheap, readily available, and explosions are few and far between.

    Even so, I err on the side of caution. Whenever I use the gun, I don protective eyewear, Kevlar vest, and I wrap the air tank (mine is pneumatic) in an old pair of denim jeans.

    PVC is also weakened by UV light, so don't store it outside with the sun. It would probably be best to rebuild the gun every few months, just to be sure.
  17. goings_51

    goings_51 Well-Known Member

    I always wanted to make one from metal piping that would use propane and fire a 12 oz soda can. I think a spark plug attached to a car battery would make the best igniter.
  18. Logan5

    Logan5 Well-Known Member

    Strange... I've always read and been told that ABS pipe is the way to go, and to stay far away from PVC, for just the reasons previous posters have pointed out.
  19. zahc

    zahc Well-Known Member

    I went with PVC because I had trouble finding ABS locally. My main spudder at home is ABS and has many bags of potatoes through it. I don't like the PVC because it's much heavier. I also remember the pvc pipes in my father's house that are so brittle they break if you just bump them. I plan to wrap it in some duct tape and paint it to keep the sun off, then retire it early.

    You can actually see the flame from just the latern lighter through the PVC. Cool, but freaky.
  20. Third_Rail

    Third_Rail Well-Known Member

    FWIW, PVC is extremely carcinogenic (cancerous growths have been noted within months) when inside the body, and doesn't show up on X-ray photographs, so is very hard to find and remove. Think of that when you're thinking "maybe a bit more fuel would be okay...." :)

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