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AT-4

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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Unread postAuthor: dauphinoise potato » Thu Jul 26, 2007 3:53 am

WOW that is a nicely made cannon, What kind of damage does it do? Do you know what kind of hangtimes you get whith this cannon?
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Unread postAuthor: singularity » Thu Jul 26, 2007 2:28 pm

all i have are a few pictures of a piece of 1/2 plywood i destroyed with an empty co2 cartridge wrapped in duct tape. it went straight through and kept on going, never did find it. i think i was 20-30ft away from the plywood at the time

<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/0514071619a.jpg">

<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/0514071619.jpg">

sorry about the quality i took them with a cell phone cam
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be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Unread postAuthor: noob of noobs » Thu Jul 26, 2007 7:03 pm

Ohhhh.... Thanks for clearing up the math for me! (Algebra's always the class that kicks me off the gold honor roll :evil: ) Makes sense. I knew I was missing something! Also, those are some awesome damage pics! Haha, you can see the cell phone shadow on the plywood! :D
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Unread postAuthor: dauphinoise potato » Fri Jul 27, 2007 6:42 am

OOoh that ply got haggard, the pictures aren't that bad.
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Unread postAuthor: spud yeti » Fri Jul 27, 2007 7:06 am

wow! (I think that sums my emotions towards the damage pictures)
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really good quote/phrase here
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Unread postAuthor: Alabaster » Sat Jul 28, 2007 12:52 am

How much was your budget on this?
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Unread postAuthor: singularity » Sat Jul 28, 2007 10:49 am

i really don't know i built this over like a 3 month period (started it got sick for a month then finished it and slowly add parts for look) if i were to guess i would say over $50. i never really have a budget because i have like 3 projects going at once (so i don't get bored when i don't have the right pieces)
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be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Unread postAuthor: Flying_Salt » Sun Jul 29, 2007 9:04 pm

TwitchTheAussie wrote:Are you left handed by any chance?


Everyone is born right-handed. Only a few overcome the handicap (including me).

I was lurking around, too lzy to post for too long, that is an amazing cannon. Put some ear plugs on and take it as far as you dare to take pvc and see what happens.

I like it. You get a cookie.
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sgort87 wrote:I hereby present Flying_Salt with The one and only <a href="http://www.geocities.com/sgort87/ghetto">Ghetto Award!</a>
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Unread postAuthor: BOMBOMBOMB » Thu Oct 11, 2007 7:49 am

Wow good photos with the phone what pixels you running? oh and thanks for the maths we got a test on algebra soon good revision lol. Anyways shes beuty could someone link me to what a piston is and hwo it works
Cheers Nato
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Unread postAuthor: BOMBOMBOMB » Thu Oct 11, 2007 7:58 am

singularity wrote:noob of noobs no not so you actually have to do some math to find the ratio... to make this easy im going to say the air chamber and barrel are 40" (which is pretty close to the real length). the first thing we need to do is find the volume of the barrel (pi*r2*h) so pi*.25*40=31.42 the volume of the barrel, now the same equation is used to find the area of the chamber. pi*2.25*40=282.74 but we need to subtract the area of the barrel becuase its a coaxial. 282.74-31.42=251.32 now to find the ratio i divide 251.32 by 31.42 and we get a C:B ratio of 7.99:1 but i did not incorporate the wall thickness of the pipe so its a slightly smaller than 7.99:1 but still way overkill for a pneumatic


could please explain what the variables are(pi,r and h are nto measurment wise but what they are
cheers Nato
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Unread postAuthor: Hubb » Thu Oct 11, 2007 8:01 am

Pi is pi. It is equal to 3.14 or 22/7, whichever.

R is radius. It is equal to 1/2 the diameter, or d.

h is height or length, whichever you want to call it.

Also, try not to double post, the mods (nor anyone else) likes it.
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Unread postAuthor: glompos21 » Thu Oct 11, 2007 12:35 pm

Thats a great gun
Can you make a diagram how the gun work( i am a noob) and re upload the deleted pictures?.
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Unread postAuthor: BOMBOMBOMB » Thu Oct 11, 2007 4:25 pm

sorry about the dooble post so wats the pi on a gun?
Cheers Nato
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Unread postAuthor: Hubb » Thu Oct 11, 2007 4:29 pm

pi is a math constant. Not relevant to the gun itself, but relative any time a circle is involved.
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Unread postAuthor: BOMBOMBOMB » Thu Oct 11, 2007 4:31 pm

ohhh pie lol sorry i got ya now :P. I school uses the symbol instead but obviosly you cantt ype the symbol thanks for your help.
Cheers Nato
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