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School Cannon

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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Unread postAuthor: D_Hall » Mon May 05, 2008 7:50 pm

And just for grins I just simmed: 3"x12" chamber, 100 psi, 3/4" QEV, 3"x24" barrel, 1 lb projectile...

103 fps.

I'm gooood. ;)
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Unread postAuthor: STHORNE » Mon May 05, 2008 7:52 pm

D_Hall wrote:And just for grins I just simmed: 3"x12" chamber, 100 psi, 3/4" QEV, 3"x24" barrel, 1 lb projectile...

103 fps.

I'm gooood. ;)


Hey! I was gonna say that.... :(

lol, nice work and ugh....yeah...I guess your "good" lol
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Unread postAuthor: Ragnarok » Mon May 05, 2008 7:57 pm

daberno123 wrote:BTW Ragnarok- Love the new sig, where'd you find it?

Ah, well, if I see an amusing quote, it will often become a new sig. I found it when doing a search for the exact wording of another of Douglas Adams' quotes:

"Mark Knopfler has an extraordinary ability to make a Schecter Custom Stratocaster hoot and sing like angels on a Saturday night, exhausted from being good all week and needing a stiff beer."

... Which he said about the guitar in Dire Straits' "Tunnel of Love"
If you think about it too much, it makes no sense, but it's the most damned accurate description of the playing I have ever heard.

But I found the potato one at the same time, it's one I've seen before, but on seeing it again decided it was appropriate for the forum.
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Unread postAuthor: jrrdw » Mon May 05, 2008 8:16 pm

I would get this and add this! For under $100.00 bucks, can't go wrong! Sometimes I scare myself.
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Unread postAuthor: Ragnarok » Mon May 05, 2008 8:27 pm

jrrdw wrote:Sometimes I scare myself.

And sometimes I scare other people. It's more fun that way.

Whenever there is a problem and they say they can't think of a solution, just tell them you've got a plan involving a dirigible, two ducks and half a ton of explosives - you'd be surprised how often they do actually have a solution.
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Unread postAuthor: MrCrowley » Tue May 06, 2008 12:15 am

With my 4"x1' chamber, a 1" sprinkler valve and a 3"x1.5' barrel, I launched a t-shirt easily 50m at 80psi.

Either go with the 3/4" QEV or the 1" sprinkler, just reinforcing what everyone else is saying.


I accidently posted this in the 'Badge thread' :lol:
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Unread postAuthor: daxspudder » Tue May 06, 2008 12:34 am

okay, i dont really have any useful input for you, but even the weakest setup is gonna yield at least a 50 fps muzzle velocity, and i know if i wanted a hotdog, i wouldnt want it coming at me like that, unless wrapped, even then a hotdog is a relatively heavy compact(wrapped) projectile, so my thought is to recommend to your principal that its for shirts or confetti only.... i can just see the headline/lawsuit "high school student pummeled with hotdog loses eye" lol.
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Unread postAuthor: clide » Tue May 06, 2008 10:36 am

I've just glanced over the rest of this thread, so sorry if it has been pointed out before. We had a member hear who was fond of making t-shirt cannons, but one of them exploded injuring many and I believe his dad lost an eye. So I would suggest metal for something that is going to be used in a crowded place. If you can't go with metal then just make sure it has a pop safety valve to prevent over pressurization.
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Unread postAuthor: MaxuS the 2nd » Tue May 06, 2008 10:49 am

And you have to remember that some fool will most likely drop it whilst pressurised.
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Unread postAuthor: rcman50166 » Tue May 06, 2008 11:01 am

Yes, this is true. Make sure you make it extra weak then! JK. To make it dropable you should use pipe insulation to cusion falls, also you want to make sure there aren't any leverage points on the gun for gravity to take advantage of. (Corners, thin points, etc.) Make the cannon idiot proof too. Add a strap on the handle to make sure some couldn't possibly drop it. ( or throw it like the whole Wii Controller incident :) )
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Unread postAuthor: Carlman » Tue May 06, 2008 12:22 pm

rcman50166 wrote:( or throw it like the whole Wii Controller incident :) )


haha that has happened to me to, damn golf :roll:
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Unread postAuthor: Ragnarok » Tue May 06, 2008 5:31 pm

Carlman wrote:haha that has happened to me to, damn golf :roll:

Golf? I find it's most likely with the Tennis...

There's actually a video of me and some mates playing Wii tennis with me and a couple of mates in the next room from the Wii with the controllers, and a group in the other room shouting instructions.

It worked surprisingly well until we forgot who was giving each of us instructions, whereupon flailing ensued.
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Unread postAuthor: n-strike » Tue May 06, 2008 7:19 pm

I think you should do some testing what psi would be best for shooting shirts.
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