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Big ghetto pneumatic (40ft barrel :)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Big ghetto pneumatic (40ft barrel :)

Unread postAuthor: Fnord » Fri Apr 20, 2007 7:44 pm

I've had this thing together for about 6 months, but had recently taken the valve off for part of my contest gun. I got another valve a few days ago and put it together today.

The tank is an old water tank which is 16"x 48", and the barrel is two sections of 1" steel well pipe.

I only got to fire it once today, but I have included pictures damage from last year. today I just fired a piece of pipe at a slab of steel to clean the dirt out of the barrel.

I doubt its as powerful as the swat gun, but the price was right ($15 for fittings and valve lol)

The forcast in ohio is finaly warm this weekend, so hopefully I'll get to have some fun for the next couple days.
Give me ideas of what I should shoot! :D
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Attachments
dmg2.jpg
a piece of pipe I shot at a tree. Im guessing it sunk in about 6-8"
The mark higher up is from a ricochet
dmg1.jpg
I discovered this 50 feet away from a tree I shot. aparently it bonced at a 90* angle and went through 6 inches of sasafras. never found the projectile.
100_3711.JPG
the pipe I fired today, after it met the steel target. It was very hot and so deformed from impact that it is now too big to fit in the barrel.
100_3705.JPG
The test fire target today was a .75inch steel plate
fullshot.jpg
the gun is set up beside my shed. the image is distorted slightly
view1.jpg
the chamber. sorry about the ball valve :) the barrel is so long it doesnt decrease preformance much
Last edited by Fnord on Fri Apr 20, 2007 10:36 pm, edited 3 times in total.
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Unread postAuthor: Velocity » Fri Apr 20, 2007 7:56 pm

Very nice cannon! Usually, I would rant about the ball valve, but considering that you have a huge chamber and barrel, I honestly feel that if you used a QEV or sprinkler valve, you would only be decreasing performance.

Once again, very unique design... I really enjoyed seeing this gun!
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Unread postAuthor: VH_man » Fri Apr 20, 2007 8:08 pm

DAMN thats powerful........... the projectile even heated up......... WOW. i think you should make a high-pressure piston valve for that thing, and pressurize it to like 1000 PSI........ it would be like the Small Bore Swat Gun. What PSI do you fire it at?
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Unread postAuthor: TwitchTheAussie » Fri Apr 20, 2007 8:10 pm

Damn that thing is big. I wouldnt like to be hit by a bit of pipe like that poor tree. Good work :thumbright:
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Unread postAuthor: Fnord » Fri Apr 20, 2007 8:17 pm

The shot today was only at 80 psi.
There is NO WAY I would put 1000 psi in that thing :)
Tanks like that normaly only use about 60psi, but this one is tested to 200.
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Unread postAuthor: XxtriviumxX » Fri Apr 20, 2007 8:35 pm

WOW that is a big gun, it put a nice hole it that tree to. Good work :D
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Unread postAuthor: From_Hamsterdam » Fri Apr 20, 2007 9:19 pm

that is so awesome. Fill a pipe with lead :twisted:
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Unread postAuthor: schmanman » Fri Apr 20, 2007 9:24 pm

nice.

I dont mean to sound gay/retarded/jerky, but thanks for the acknolodgements everyone!

damn, now I have to get a 60 foot marble barrel! :wink: :lol:


*waits for chaos*
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Unread postAuthor: PVC Arsenal 17 » Fri Apr 20, 2007 9:57 pm

crap that thing is big. I've always wondered what would happen to a Barbie doll travelling at high velocity. Please shoot one and let me know.
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Unread postAuthor: mega_swordman » Sat Apr 21, 2007 3:38 am

Why, yes. That certainly is very big and ghetto. Have you tried making cannonballs for this cannon yet. It certainly would be rich to see the damage of that considering what you did with that pipe. Kudos to you.
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Unread postAuthor: scatdawg » Sat Apr 21, 2007 7:51 am

the bigger the better. that thing is awesome
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Unread postAuthor: schmanman » Sat Apr 21, 2007 8:37 am

PVC Arsenal 17 wrote:crap that thing is big. I've always wondered what would happen to a Barbie doll travelling at high velocity. Please shoot one and let me know.


I did that once.... or twice...

It went through several sheets of 3/4 inch plywood, but the barbie ended up in lots of little pieces.
the hair was ripped off, and the face was mutilated and torn.
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Unread postAuthor: frankrede » Sat Apr 21, 2007 11:19 am

wowsa.
So is there hang time from when you open the valve and when the projectile leaves the barrel?
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Unread postAuthor: Fnord » Sat Apr 21, 2007 12:21 pm

Not much, but it depends a little on the projectile weight. maybe 1/2 a second at the most.
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Unread postAuthor: Fnord » Mon Apr 23, 2007 8:48 pm

Here are a couple damage shots I did over the weekend. I took videos too, but right now I dont have a fast enough connection to upload them.
In addition to the pictures below, I shot 3 gallon jugs lined up and filled with water. The projectile never even noticed they were there, and continued on its path to rip trenches into my yard.
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111.jpg
freezeframe of some 3/4 inch plywood getting a hole put in it. The projectile was a 4"x .5" aluminum slug, and was no where to be found.
100_3761.JPG
the second shot almost went through .25 inch steel. It probably would have had I used more than 60 psi.
100_3759.JPG
I had part of an old satalite dish which looked like a prime target.
This thing probably weighs 20-30 pounds, and was thrown back about 5 feet from impact.
This picture gives a better look of the depth of the dent than the second.
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