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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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School Cannon

Unread postAuthor: STHORNE » Mon May 05, 2008 5:30 pm

Since I am known as the "SpudGun Expert" at my school, my principal asked me if I could make a launcher for shirts and hot dogs for football games...

It doesn't need to be powerfull...just to launch the stuff atleast 50 yards at a good arch so nobody is injured.

The chamber is planned to be 4" and the barrel has to be 3".

I am debating whether to use an over-under design with a sprinkler valve (2" ports) Or whether to make a QEV. Has to be hand-held ( can be below the waste with handles) and weigh a maximum 15 lbs.

My question is what design should I use and what specs/pressures would work best for lightly-launching T-shirts?

I searched everywhere for "T-shirt launchers" and came up with nothing...

Your fellow spudder,
STHORNE

P.S.
I'm getting paid $250 (including a kick-ass paint job...)
School colors = Purple and Yellow
Mascot = Indian
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Unread postAuthor: jrrdw » Mon May 05, 2008 5:35 pm

C02 regulated in line. Nuff said! :wink:
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Unread postAuthor: STHORNE » Mon May 05, 2008 5:36 pm

jrrdw wrote:C02 regulated in line. Nuff said! :wink:


oh yeah.... completely skipped my mind...fast refill, totally portable...thanks :D

still unanswered questions...
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Unread postAuthor: bigbob12345 » Mon May 05, 2008 5:47 pm

I would reccommend a piston valve but a 2in sprinkler would work too, itll just cost you twice the price :lol:

And i wouldnt go too overkill on the chamber, you would'nt want people going deaf. I would reccomend a 24in long 4in chamber at most.

I wish I got a task like that at my school :(
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Last edited by bigbob12345 on Mon May 05, 2008 5:52 pm, edited 1 time in total.
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Unread postAuthor: STHORNE » Mon May 05, 2008 5:50 pm

bigbob12345 wrote:you would want people going deaf


I hope that was a typo lol...

and yeah...a piston valve would be good but I would rather stay away from the homemade stuff as far as internals go because if something goes wrong with it...my ass is grass...

and I wouldn't go overkill at all...if anything, underkill (if that were a word)..
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Unread postAuthor: bigbob12345 » Mon May 05, 2008 5:54 pm

Well If you dont want to go homemade then yeah, 2in sprinklers your best option.

And yes that was a typo, sorry about that.

And completely off topic but i just read your sig and couldnt stop laughing for like 5 min :lol:
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Unread postAuthor: STHORNE » Mon May 05, 2008 5:58 pm

bigbob12345 wrote:Well If you dont want to go homemade then yeah, 2in sprinklers your best option.

And yes that was a typo, sorry about that.

And completely off topic but i just read your sig and couldnt stop laughing for like 5 min :lol:


yeah...ill stick with the 2" over-under then. unless there are objections?.. (cricket chirping).

Alright then! Over-under it is! Thanks for the help guys...ill make some blueprints and post them later.

lol, like the sig eh? just thought it up after reading one similar to it in an e-mail I got... I loved it so much it deserved a spot in my sig :D
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Unread postAuthor: biggsauce » Mon May 05, 2008 6:00 pm

Does the $250 include material cost, or is that for your work? With a regulator, 2" sprinkler valve, and assorted parts, you may not make much profit... but that may not be your goal
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Unread postAuthor: STHORNE » Mon May 05, 2008 6:02 pm

biggsauce wrote:Does the $250 include material cost, or is that for your work? With a regulator, 2" sprinkler valve, and assorted parts, you may not make much profit... but that may not be your goal


thats what he will buy the cannon for, I pay for parts...

and yeah...way i figure it...the maximum this gun will cost me is $100-$120
maybe even less.. oh, then the regulator...another $50 max (i got connections).

HUGE PROFIT!!!
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Unread postAuthor: biggsauce » Mon May 05, 2008 6:04 pm

$120? What sort of CO2 setup are you planning? Are you getting some parts for free?
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Unread postAuthor: STHORNE » Mon May 05, 2008 6:05 pm

biggsauce wrote:$120? What sort of CO2 setup are you planning? Are you getting some parts for free?


Me wrote:i got connections
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Unread postAuthor: biggsauce » Mon May 05, 2008 6:06 pm

...and I totally missed that part... :oops:
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Unread postAuthor: bigbob12345 » Mon May 05, 2008 6:11 pm

Wait so the entire gun is going to cost you $120 when a 2in sprinkler costs $80 minumum and the reg will cost $50. There is $130 right there and you also need the fittings and pipe so Id say your looking at more like $160-$170 minimum
That is unless you got connections on the sprinkler valve too.
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Unread postAuthor: STHORNE » Mon May 05, 2008 6:14 pm

bigbob12345 wrote:Wait so the entire gun is going to cost you $120 when a 2in sprinkler costs $80 minumum and the reg will cost $50. There is $130 right there and you also need the fittings and pipe so Id say your looking at more like $160-$170 minimum
That is unless you got connections on the sprinkler valve too.


I found some on ebay...$35 buy it now...

already ordered this afternoon :) just one though

link is a secret so don't ask...just search yourself, still like 5 left
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Unread postAuthor: bigbob12345 » Mon May 05, 2008 6:21 pm

$35!!!
Thats a really amazing price!!!!!

I just had a quick search on ebay for it and came up with nothing.
Does the link really have to be a secret, maybe i can get some guys to force it out of you :glasses4: jk
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