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Pneumatic launcher

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Pneumatic launcher

Unread postAuthor: pricetag » Mon Apr 07, 2008 9:39 pm

I have a bit of experience with making basic pneumatic spud cannons and I have a question. I need to make a pneumatic "launcher" like this one: http://video.google.com/googleplayer.swf?docId=6157101787435882287&hl=en

I made a simple version (potato cannon with an end cap with a hole at the end) out of pvc, filled it with water, pumped it up, and fired. It worked very well, I felt the tremendous power. I tested it out a second time and the whole with exploded at the connections, ripping a lot of the skin off one of my middle finger. So, can anyone help me make one that wont explode?
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Unread postAuthor: FordGtMan » Mon Apr 07, 2008 9:42 pm

What is that a pic of? A bike?
Edit: sorry i thought it was a pic... :? vid wasn't working for me..
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Unread postAuthor: pizlo » Mon Apr 07, 2008 9:57 pm

Well you obviously did a poor job PVC cementing the joints of your first. To make a safe one use pressure rated pipe, and PVC cement properly. As for what to build just look through the site!
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Unread postAuthor: pricetag » Mon Apr 07, 2008 10:18 pm

I will make sure the joints will be cemented. But I want to have a nozzle at the end so it sprays the water out creating a lot of thrust in the other direction.
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Unread postAuthor: FordGtMan » Mon Apr 07, 2008 10:43 pm

I say you make the nozzle out of epoxy, cheapest thing your probably gonna get, unless you have a lathe. Would you other experienced epoxy casters agree?
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Unread postAuthor: Carlman » Mon Apr 07, 2008 11:55 pm

you do know that is off jackass 2...and thats the johnny Knoxville, don't you?

http://www.youtube.com/watch?v=RSghOojD4Ko

You could buy heaps of fittings that would work just fine as a nozzle pre-made.
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Unread postAuthor: pricetag » Tue Apr 08, 2008 7:11 am

Yeah, can anyone point me in the right direction for a design? should i use pvc pipe? or some type of tank like they used in the video?
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Unread postAuthor: Jared Haehnel » Tue Apr 08, 2008 7:26 am

:laughing3: here's some light reading everything you need to know

http://www.spudfiles.com/forums/pneumat ... n-f26.html

After reading for a while my brain some times feels like this....:violent2:
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Unread postAuthor: pricetag » Fri Apr 18, 2008 10:16 pm

Okay, so here's the basic plan, tell me what you think.

Image

The first one has the reducers in the pneumatic compression chamber leading down to a small ball valve. The second one is the same except there is a large ball valve then the reducers. To use it, it will be filled with water, pressurized, then fired.
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Unread postAuthor: tmacd995 » Fri Apr 18, 2008 11:31 pm

yea, but bell reducers are usually DWV, at least at my Home Depot
Make sure everything says NSF-PW before you buy it or else its no good
It could say NSF-PW on the outside or or the ring around the socket
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Unread postAuthor: Hydra » Sat Apr 19, 2008 12:59 am

Large BV with reducers, although it might choke the flow a bit, but the huge ball valve will more than make up for choking the flow.
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Unread postAuthor: TurboSuper » Sat Apr 19, 2008 7:44 am

Shooting water is a baaad idear if you fill up the whole barrel. It creates [insert wiseass physics knowledge here] that can make your gun explode.

Stick to taters :D
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Unread postAuthor: sniper hero » Sat Apr 19, 2008 8:14 am

huh I think he means filling the chamber with water so it is a real rocket
am I right?
but don't use your hand for opening the valve but use a rope, radiocontrolled or something else. no matter if you fill a barrel or chamber.
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Unread postAuthor: bigbob12345 » Sat Apr 19, 2008 8:19 am

TurboSuper wrote:Shooting water is a baaad idear if you fill up the whole barrel. It creates [insert wiseass physics knowledge here] that can make your gun explode.

Stick to taters :D


Please explain this [wiseass physics knowledge] because I dont see how it could possibley make it explode :? Water is heavy if you use enough but wouldnt shooting heavy things be the same.
And Ive done it dozens of times, with no explosion what so ever.
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Unread postAuthor: TurboSuper » Sat Apr 19, 2008 9:39 am

Did you fill the whole barrel?

What was the cannon made out of?

I think it's just newton's action-reaction law in action. I remember someone had the same problem back on SpudTech.
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