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Shot Results! First Air Cannon./any ideas on how to improve?

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: mopherman » Tue Jun 05, 2007 8:16 am

Matt221985 wrote:yes, the chamber is rated for 350 psi and the barrel is rated for 120 psi, i washed off all the lettering so thats why u cant see it...

As "hi" was saying i shouldnt go over 60 psi becuz of my fittings, if i were to use it at 60psi with the fittings already on there..how much power would i get from 60 psi out of a cannon this size? enough to throw a spud 200 yards or so?

At 60 psi, you should probably buy a sprinkler to get better performance. 1.5 ball valvs are a [female doggy] to turn. (unless you got the meatl one)
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Unread postAuthor: turbohacker » Tue Jun 05, 2007 8:53 am

It probably would do 200yds, I do recommend switching the parts out for pressure rated parts though, that way if you use a ball valve then you could get the pressure safely to around 200psi. It is however a very nice gun, especially for your first, congrats!!! :D
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Unread postAuthor: Matt221985 » Tue Jun 05, 2007 12:08 pm

thanks alot! yea, im gunna try it with 60 psi with what i have on it now when i get my ball valve(metal) and see how it does, but eventually change the fittings, only have $6 into the fittings, so no biggy
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Unread postAuthor: pyromaniac » Tue Jun 05, 2007 1:30 pm

the reduceing peice you need is a bushing you fit it inside a coupler. here a picture of the right reducer.
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Unread postAuthor: lukemc » Tue Jun 05, 2007 3:55 pm

fittings are cheap surgery isnt. but for safty sake just replace the parts.
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Unread postAuthor: Matt221985 » Tue Jun 05, 2007 8:45 pm

Update:

Ok call me stupid but im keeping the fittings i have on it for now and the ball vavle is on, so when i go to test it tommorow should i put air in it and let it sit to see if anything is going to go wrong?
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Unread postAuthor: integral » Tue Jun 05, 2007 9:08 pm

Thats exactly the problem mate. You cannot determine the exact time or even a vague estimate to when it might fail. It could pop on the first time or 2 months down the track. If your test shows that it didn't fail, that would only make it more likely to fail the next time. If you value current way of life, don't play roulette and just replace the fittings.
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Unread postAuthor: Matt221985 » Tue Jun 05, 2007 9:35 pm

ok, so its all done, now for those who know and see my fittings are wrong,,,Ive decided to use it for a low pressure gun, so nothing over 55 or 60 or maybe less. Gunna have a little fun with this one and then next pay day build a new one, the right way..
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Unread postAuthor: Matt221985 » Tue Jun 05, 2007 9:43 pm

BTW, tomm is the big test, wish me luck :!:
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Unread postAuthor: hi » Tue Jun 05, 2007 9:46 pm

wrap the bad parts it in alot of duct tape, just incase. maybe 5 layers. if you have any chicken wire or mesh then go around with that too.

mesh on the inside and duct tape on the out side.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: Matt221985 » Tue Jun 05, 2007 9:50 pm

yea, black duct tape, i was thinking of painting it black, so itll match, lol

Whats everyone think about the looks of it, i think its ok for a first...
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Unread postAuthor: hi » Tue Jun 05, 2007 9:57 pm

for a first it looks good. much better than my first. i didnt know about this web site when i built my first, so as you can guess it sucked because i didnt have anything to base it one, hell i didnt even know that pvc glue existed. it was fun, but very ugly. i wound up using pvc (epoxy to glue the pvc), copper elbows that were epoxyed toogether and alluminum electrical pipe (not pressure rated) for the barrel. now that i think about it, mine did suck! but then again i
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: integral » Tue Jun 05, 2007 10:59 pm

Wasn't there a thread on spudtech rendering the use of duct tape/chicken wire useless for protecting the operator from shrapnel?

Looks very clean for a first, you should be proud.
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Unread postAuthor: Matt221985 » Tue Jun 05, 2007 11:26 pm

integral wrote:Wasn't there a thread on spudtech rendering the use of duct tape/chicken wire useless for protecting the operator from shrapnel?

Looks very clean for a first, you should be proud.


is there ?
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Unread postAuthor: hi » Tue Jun 05, 2007 11:52 pm

there was one, but only for duct tape. with the use of mesh it will stop it.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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