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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: STHORNE » Mon May 05, 2008 6:23 pm

bigbob12345 wrote:$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 an get some guys to force it out of you :glasses4: JK


lol, I'll tell you the link if you give me 300 spudbux :glasses5:

lol...can't even find it...forgot to bookmark it.
let me see if i can find it again
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Unread postAuthor: bigbob12345 » Mon May 05, 2008 6:28 pm

I would give you 300 if i could
I thought the spudbux exchange thing wasnt around any more
I want one of those :kermit: lol the smilies are weird
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Unread postAuthor: STHORNE » Mon May 05, 2008 6:29 pm

bigbob12345 wrote:I would give you 300 if i could
I thought the spudbux exchange thing wasnt around any more
I want one of those :kermit: lol the smilies are weird


lol, ask PCGUY to take away 300 from yours and add 300 to mine...

nah...I'll just tell you on msn..
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Unread postAuthor: D_Hall » Mon May 05, 2008 6:30 pm

You don't need much power. I'd go with the 3/4" QEV and a metal chamber. All-metal = more robust. The last thing you want is the gun to come apart due to mishandling and the powers that be to blame it on "poor worksmanship" and/or "bad design."
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Unread postAuthor: STHORNE » Mon May 05, 2008 6:32 pm

D_Hall wrote:I'd go with the 3/4" QEV


read original post.

*cough*3 inches*cough*
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Unread postAuthor: bigbob12345 » Mon May 05, 2008 6:33 pm

STHORNE wrote:
bigbob12345 wrote:I would give you 300 if i could
I thought the spudbux exchange thing wasnt around any more
I want one of those :kermit: lol the smilies are weird


lol, ask PCGUY to take away 300 from yours and add 300 to mine...

nah...I'll just tell you on msn..


My msn account is messed up

How bout you PM me :rr:
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Unread postAuthor: STHORNE » Mon May 05, 2008 6:34 pm

my pm centre is insanely slow... msn or nothing, sorry :cry:
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Unread postAuthor: D_Hall » Mon May 05, 2008 6:39 pm

STHORNE wrote:
D_Hall wrote:I'd go with the 3/4" QEV


read original post.

*cough*3 inches*cough*


I did. I maintain my stance. You're not trying to push high velocities here. 100 fps is probably all you need. Add a relatively massive projectile to the mix.... Granted, I've not had enough time to run the numbers, but my gut feel is that the 3/4" QEV is sufficient.
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Unread postAuthor: STHORNE » Mon May 05, 2008 6:42 pm

D_Hall wrote:
STHORNE wrote:
D_Hall wrote:I'd go with the 3/4" QEV


read original post.

*cough*3 inches*cough*


I did. I maintain my stance. You're not trying to push high velocities here. 100 fps is probably all you need. Add a relatively massive projectile to the mix.... Granted, I've not had enough time to run the numbers, but my gut feel is that the 3/4" QEV is sufficient.


kind of hard to fit a T-shirt / hot dog (with bun) in a 3/4" pipe.. unless your god :angel4:
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Unread postAuthor: Gippeto » Mon May 05, 2008 6:50 pm

I do believe he (D Hall) understands how big a t shirt is.

He is talking about the VALVE. ( a qev is a valve)

A 3" barrel could be attached to a smaller valve.

You do understand, (I hope) that your not trying to punch that t shirt through someone?
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Unread postAuthor: STHORNE » Mon May 05, 2008 6:52 pm

Gippeto wrote:I do believe he (D Hall) understands how big a t shirt is.

He is talking about the VALVE. ( a qev is a valve)

A 3" barrel could be attached to a smaller valve.

You do understand, (I hope) that your not trying to punch that t shirt through someone?


lol, totally missed the 3/4" QEV. thought he meant barrel (for some odd reason)...

wow i look like a tard :oops: sorry bout that D Hall
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Unread postAuthor: brogdenlaxmiddie » Mon May 05, 2008 7:05 pm

I agree with D hall... It would be better to use the QEV because you just wanna push out the shirt/hotdog and not beat someone to death with a shirt and or hotdog.... Also, one thing you could do is get one of those co2 things from home depot... they use them for pnuematicaly driving nails... you could prolly figure out how to use one for your purposes. :D
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Unread postAuthor: potatoflinger » Mon May 05, 2008 7:05 pm

D_Hall wrote:You don't need much power. I'd go with the 3/4" QEV and a metal chamber. All-metal = more robust. The last thing you want is the gun to come apart due to mishandling and the powers that be to blame it on "poor worksmanship" and/or "bad design."

That's what I would do if I were in your position, if you use PVC there are a lot of extra hazards that aren't really necessary (especially since you're using regulated CO2). I would say go with the 3/4" QEV and a galvanized steel chamber.

I have a 3/4" QEV on my tennis ball cannon, and it has plenty of power, enough to launch a tennis ball 150 yards.

EDIT: If you already ordered that 2" sprinkler valve, you can make yourself a cannon with it.
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Unread postAuthor: STHORNE » Mon May 05, 2008 7:08 pm

ok...i cancelled the 2"SV order.

maybe a link to a cheap 3/4" QEV??
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Unread postAuthor: bigbob12345 » Mon May 05, 2008 7:11 pm

Search part #6646K23 on mcmaster
The type you want is type F at the bottom
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