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Goat's MCS

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: goathunter » Thu Jan 10, 2008 12:30 pm

bigbob12345 wrote:WOW that is amazing.I wish I had the patience, money, and time to accomplish something like that.


Patience,yes.Time, no.I worked on it on and off for 2 months.And money defineately NO!! the gun only cost me $32 :wink:


Sorry guys I haven't gotten vids up yet.I've got a USMMA app. due and it has been putting me through the hoops :roll: Oh well, good training for when I become an officer.As we all know if it streamlined and efficient it isn't government :D
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Unread postAuthor: judgment_arms » Fri Jan 11, 2008 12:20 am

Oh man, that gun liked to make me cry, pure beauty…

Hey Goat, you mind if I borrow your designs? Don’t want to steal it, and this thing’s so slick I might just have to make one. :)
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Call me "Judge", it's easier to type.

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Unread postAuthor: goathunter » Fri Jan 11, 2008 12:55 pm

By all means go ahead.I'm not the jealous kind.

Just don't make my baby look too bad...
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Unread postAuthor: Brian the brain » Fri Jan 11, 2008 2:33 pm

Very nice!!
I like the breech and it's locking mechanism very much.

ou asked if anything could be improved, and although it;s clear you have made a true beauty, I have some ( positive!!)suggestions.

Somehow the "handle"part on the stock you used seems out of place because it is no longer used as such.I feel you would have been better off sculting the shoulder stock yourself, without the bulges.You seem to be good at it so..

The other suggestion is...next time, before you bury the pressure washer handle under a heap of bondo, take it apart ( too late now) and scrape out the seal.It;s made of strange grey material that comes apart surprisingly easy.Remove it completely and replace it by an O-ring.You might have to remove a tiny amount of the brass to make it seal onto the rod.
Glue the O-ring in place and Voila...No hissing ever.
I had the same problem and have solved it succesfully this way.
The rubber O -ring does not crack because of dropping temperatures either.

Great the handle can take 800 psi aint it??
Opens up so many possibilities.
Have fun with your cannon!!
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: goathunter » Fri Jan 11, 2008 4:04 pm

Somehow the "handle"part on the stock you used seems out of place because it is no longer used as such.I feel you would have been better off sculting the shoulder stock yourself, without the bulges.You seem to be good at it so..


Trust me, that was pet peeve of mine from the beginning.Unfortunately the mauser stock I used was too thin to cut the hand hold out without taking a chance on breaking the stock off somewhere down the line.And of course I was too lazy to go about building a whole new stock :D

before you bury the pressure washer handle under a heap of bondo, take it apart ( too late now) and scrape out the seal.It;s made of strange grey material that comes apart surprisingly easy.Remove it completely and replace it by an O-ring.You might have to remove a tiny amount of the brass to make it seal onto the rod.
Glue the O-ring in place and Voila...No hissing ever.


I did take mine apart.It was a little different.The valve face is straight brass(no hope of sealing that) and a ball bearing fits in there and "seals" it off.I have no rubber in there except an o-ring that is behind the threads.
Believe it or not I was a little happy about this.No seals means no stuff to replace when the C02 eats it away.

I alleviated the problem with a ball valve before the main valve.I had to put it there anyways.Field owners are crazy about safety.

Great the handle can take 800 psi aint it??
Opens up so many possibilities.


Yes it does.Especially when things like ideas for small caliber semi autos start popping up... :twisted:
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Unread postAuthor: PinHead » Wed Feb 13, 2008 5:01 pm

Very nice design, calling it clean wouldn't do it justice. I had been thinking of doing a break-barrel design for paintball scenario until I saw that you had beaten me to it with your first gun, which was impressive in its own right - but this one obviously superior.

I just have a few questions. I assume that your CO2 is self-regulated to 800 psi, so you simply open the ball valve to fill your pressure chamber, then close it to fire? Or do you leave it open between shots; if so, do you lose an excess CO2 before you can close the valve? Did you consider making a piston valve of some sort, and using the handle as just the pilot, or is the washer handle sufficient on it's own?

I saw in the post above that you simply added the ball valve as a safety, but I suppose that it could improve your CO2 efficiency, by not letting any gas escape after you shoot. Have you ever tried to think of a design that could close off your CO2 while simultaneously opening the valve? I've been tinkering with that idea for quite some time, but haven't really found a solid solution.
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Unread postAuthor: goathunter » Wed Feb 13, 2008 6:41 pm

[quote]so you simply open the ball valve to fill your pressure chamber, then close it to fire? Or do you leave it open between shots; if so, do you lose an excess CO2 before you can close the valve? Did you consider making a piston valve of some sort, and using the handle as just the pilot, or is the washer handle sufficient on it's own? [quote]


Actually the ball valve is behind the pressure chamber.When firing in rapid succession I leave the ball valve open. If the gun needs to sit for any length of time I close the ball valve.The reason for that is the pressure washer valve hisses a little(not alot but you can hear it) and I don't want to lose any more C02 than I had too.Especially when you have to hike a half mile to get more C02 all the while getting shot at :D

Oh and the pressure washer handle is plenty sufficient for this application. The trick was building a launcher that would fit in a very narrow set of operating pressures and be reliable at that pressure.The hard part wasn't getting as much performance as I could out of it, but trying to limit the available fps. to under 230 fps.
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Unread postAuthor: Taco » Wed Feb 13, 2008 7:13 pm

That gun looks amazing... Great Job!!!
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