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I wanna build a large pnuematic cannon.

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I wanna build a large pnuematic cannon.

Unread postAuthor: Mihlrad » Thu Jul 06, 2006 1:45 pm

I decided to abandon my combustion project and return the returnable parts, and from it i have about 8 feet of 4" sch 40 left... I wanted to build something rather large... any idea? It has to be only pnuematic, i can buy any fittings that can be bought in a home depot or lowes, pipe as well... and valves. Basically anything at home depot or lowes can be used, as long as it doesnt cost an obsurd amount of money. So... any ideas? I was considering just doing a simple cannon but it didnt seem very...fun...
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Unread postAuthor: x.X.Cpt.Rollhart.X.x » Thu Jul 06, 2006 2:07 pm

make a Coaxial piston cannon.
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Unread postAuthor: djt » Thu Jul 06, 2006 2:18 pm

try to break the sound barrier with joels! i was amazed by how simple joels was when i saw it. just a regular pneumatic with a supah valve and super long barrel. it would be hard to do though unless you could make a valve with equal flow of a supah or had the money to buy one.
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Unread postAuthor: Mihlrad » Thu Jul 06, 2006 2:26 pm

yea, for me supah valve falls under obsurd amount of money. Did his pnuematic really break the sound barrier? thats rediculous....but yea something with 2 large tanks could be kinda cool... iuno... any other ideas?


And rollhart, i have no clue how to make that.
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Unread postAuthor: WOW!! » Thu Jul 06, 2006 2:52 pm

I would make a coxial piston cannon. Make it 8" long. They are very easy to make.
http://www.xinventions.com/main/spud/pac5.htm

And with the chamber being 8feet long, you can have a 10 foot barrel. If you make it, it will be powerful. SUPER POWERFUL
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Unread postAuthor: spudshot » Thu Jul 06, 2006 3:39 pm

if you're using 4" you wont be able to find any pressure rated fittings at lowes or home depot, they dont stock pressure rated over 2" you will have to go online for those fittings, http://www.plumbingsupply.com or http://www.mcmaster.com are great places for parts
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Unread postAuthor: WOW!! » Thu Jul 06, 2006 3:54 pm

really? I find Sch40 pressure rated at the Home Depot near me.
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Unread postAuthor: Mihlrad » Thu Jul 06, 2006 3:55 pm

i was kinda planning to just have it go into a coupling with a reducing bushing to go down to 2", that wont work for an air cannon?
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Unread postAuthor: Mihlrad » Thu Jul 06, 2006 3:58 pm

By the way the 8 feet is cut into about 5 and 3 feet pieces. Also, regardless of how bad i would want to make an 18 foot gun, it would never happen... too big lol.
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Unread postAuthor: LucyInTheSky » Fri Jul 07, 2006 3:21 pm

The gun would only be 10feet if it was a coaxal.
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Unread postAuthor: carlbelcher » Fri Jul 07, 2006 5:50 pm

WOW!! wrote:really? I find Sch40 pressure rated at the Home Depot near me.


pressure rated = yes

pressure rated over 2" = no
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Unread postAuthor: WOW!! » Sat Jul 08, 2006 6:07 pm

On the side it syas NSF-PW
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