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Possible Plans for Pneumatic Bazooka

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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Possible Plans for Pneumatic Bazooka

Unread postAuthor: LikimysCrotchus5 » Tue Dec 04, 2007 10:00 pm

Well ever since have seen woffers cannon, i have been inspired to create a cannon somewhat similar to his. I have seen topics that have sprung up about creating a 3 inch piston valve rather than a 3" sprinkler valve because they are hard to come by. But in woffer's cannon topic, he left a comment saying he found another 3" sprinkler valve. So this sparked my interest so then i began some research. It is a rainbird and it can be seen here. So what i am asking is that can this cannon be modded?

I assume that it has practically the same internals as a smaller sprinkler valve except this has a flow control rod i believe. I know the price is rediculous but the seller is trying to get rid of this so i can make an offer and see where i can get with that.

Now i have thought about plans of creating this monster of a cannon (aside DYI's cannon and any others i forget) I will have the same modded setup on the sprinkler except i am gonna cut down on pilot volume (Just as JSR intends us all to do :) ).

Now i did notice that restrics flow with his design. So i have thought of having it in a more straight design, like a bazooka, or rocket launcher. This should have just about no restriction at all so should be flow efficient. But im not sure if it will be too heavy for me or the recoil could hurt my shoulder. So i ask what the community thinks.

Also, ironically, i was searching for places where they may sell these valves, so i go to the rainbird website and look for places locally within 25 miles. Well, surprisingly, they have a Mc Master Carr warehouse within these 25 miles. I was shocked so to make sure it was not an illusion, i click on the link website, and surely it was Mcmaster Carr website. So i now can get just about ne thing i need for my new cannon creations.

I have not bidded on this item because this is still a possibility, so im not sure yet. Well thanks for listening. :) All opinions are very much appreciated.

EDIT: Also, does anyone have any idea how i might be able to make this cannon breech loading without making to to heavy or bulky?
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Unread postAuthor: BigGrib » Tue Dec 04, 2007 10:41 pm

i might be able to get you a 3" irritol valve at my local irrigation specialists they got a lot of cool crap i'll write back tomorrow and let you know if they have one, and i can get you a discount on em too
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Yea, that's definitely going to get you at least a tazer.

<a href="http://www.youtube.com/watch?v=AkMkGOpAF4s">DONT TAZE ME BRO.. DONT TAZE ME... AHHHH</a>
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Unread postAuthor: LikimysCrotchus5 » Tue Dec 04, 2007 10:52 pm

Oh thanks man that would be greatly appreciated. :)
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Unread postAuthor: grumpy » Wed Dec 05, 2007 10:20 am

here is a few examples of how you can do a breach load.
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 05, 2007 10:31 am

i am gonna cut down on pilot volume (Just as JSR intends us all to do :) )


It's in the holy book, and I quote:


Book of Armaments (Chapter 2, verses 9-21)

...And Saint Attila raised the sprinkler valve up on high, saying, "O Lord, bless this Thy sprinkler valve that with it Thou mayest blow Thine enemies to tiny bits, in Thy mercy." And the Lord did grin and the people did feast upon the lambs and sloths and carp and anchovies and orangutans and breakfast cereals, and fruit bats and large chu... And the Lord spake, saying, "First shalt thou remove thy solenoid and epoxy the pilot hole, then remove the guide rod, then thread your pilot valve directly to the body of thy sprinkler, lest thou increase thy pilot volume by a single iota, then lobbest thou thy potato towards thy foe, who being naughty in my sight, shall snuff it." Amen.


:D

As to breech loading, I would recommend a sleeved barrel as per grumpy's last illustration.
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Unread postAuthor: grumpy » Wed Dec 05, 2007 10:50 am

Book of Armaments (Chapter 2, verses 9-21)

...And Saint Attila raised the sprinkler valve up on high, saying, "O Lord, bless this Thy sprinkler valve that with it Thou mayest blow Thine enemies to tiny bits, in Thy mercy." And the Lord did grin and the people did feast upon the lambs and sloths and carp and anchovies and orangutans and breakfast cereals, and fruit bats and large chu... And the Lord spake, saying, "First shalt thou remove thy solenoid and epoxy the pilot hole, then remove the guide rod, then thread your pilot valve directly to the body of thy sprinkler, lest thou increase thy pilot volume by a single iota, then lobbest thou thy potato towards thy foe, who being naughty in my sight, shall snuff it." Amen.


haha jack i love that, hope you don't mind if i borrow that.
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 05, 2007 11:00 am

grumpy wrote:hope you don't mind if i borrow that.


go ahead, after all I copied it myself :)

[youtube]http://www.youtube.com/watch?v=xOrgLj9lOwk[/youtube]
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Unread postAuthor: LikimysCrotchus5 » Wed Dec 05, 2007 3:49 pm

Lol thats funny, is that from Monty python? I have never seen it but i have heard of it and it sounds very similar to this. Thank you for you reading of the gospel. :D

And also what about the structural design? Would it be good how i have it in a straight line formation, like a bazooka/rocket launcher, but the recoil and the weight wont kill my shoulder?

I was considerering the design that grumpy had for the third picture but i havent seen it used really so i wasnt sure if i should use it. Also for that breech load, would i need to lock it in or just sleeve a pipe?

And since i have never done a breech load, would a hacksaw be fine to use? I think i can but it would just be difficult.
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Unread postAuthor: ShowNoMercy » Wed Dec 05, 2007 4:07 pm

I don't mean to hijack your post here, but what is that second breech load setup called?
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Unread postAuthor: LikimysCrotchus5 » Wed Dec 05, 2007 4:12 pm

Idk but it looks like a ball valve to me but idk whats its called.

Dont worry its all good
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Unread postAuthor: ShowNoMercy » Wed Dec 05, 2007 4:14 pm

The flap thing in the first pic is also in the second design, do you know what they are called? The thing just after the union ion the first pic is what I am referring too.
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 05, 2007 5:53 pm

LikimysCrotchus5 wrote:Lol thats funny, is that from Monty python? I have never seen it but i have heard of it and it sounds very similar to this.


"Mønti Pythøn ik den Høli Gräilen" - watch it, your sides will split :D

And also what about the structural design? Would it be good how i have it in a straight line formation, like a bazooka/rocket launcher, but the recoil and the weight wont kill my shoulder?


I'd go for a properly braced over-under, otherwise you'll be severly limited for length.

I was considerering the design that grumpy had for the third picture but i havent seen it used really so i wasnt sure if i should use it. Also for that breech load, would i need to lock it in or just sleeve a pipe?

And since i have never done a breech load, would a hacksaw be fine to use? I think i can but it would just be difficult.


It's quite a common design, like these examples by Novacastrian and SpudBlaster15 - all you need is piping that fits snugly on the outside of the barrel and a couple of o-rings. You can either have it one piece and slide back and forth, or cut a projectile size hole in it and rotate it for reloading. No need to lock it, and a hacksaw should do just fine.
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Unread postAuthor: grumpy » Wed Dec 05, 2007 5:56 pm

the first picture used what is called a slice gate valve, it is the same valve used on rv's to dump waste.
the second picture is just a simple pvc ball valve.
the third picture is a slide breach in 2"pvc, just take a piece of 2"pvc to a auto parts store and get a 6 or 7 inch piece of tail pipe that slides snuggly over the pvc.
http://www.plumbingworld.com/slice_gate_valves.html
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Unread postAuthor: LikimysCrotchus5 » Wed Dec 05, 2007 6:41 pm

Ok thx for the replies but i dont know how i can get 3 i can O-rings. i have seen that design before but i didnt know that they were the same in a sense but now i see it.
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Unread postAuthor: grumpy » Wed Dec 05, 2007 7:09 pm

if you use the slide breach like in the bottom pic, the metal slide fits tight enough that it does not use orings and it works very well. actualy none of the designs use orings
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