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New Pneumatic: "Coagulation"

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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New Pneumatic: "Coagulation"

Unread postAuthor: LynyrdSkynyrd » Thu Jun 12, 2008 7:25 pm

Here is our new cannon. Its got two 3" port, chamber sealing piston valves which can be fired independently.

Total chamber volume is about 2700 cubic inches (1350 ci. per side).

Frame is made of wood and reinforced with steel. We built a recoil system for it with heavy duty 24" drawer slides, two 150 lb. garage door springs pre-tensioned, and a gas shock for a crown vic.

All fittings are pressure rated (duh) and we hope to bring this baby up to about 110 - 115 psi.

Credit also goes to DonTheLegend.


95 psi shot with a gallon of water:
[youtube]http://youtube.com/watch?v=53OXu4Hns3g[/youtube]

Damage Shots
[youtube]http://www.youtube.com/watch?v=9CdVf5hrnzg[/youtube]

more Damage Shots
[youtube]http://www.youtube.com/watch?v=rm18yHq_goI[/youtube]
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Attachments
The Cannon 001.jpg
The Cannon 008.jpg
The Cannon 009.jpg
The Cannon 010.jpg
The Cannon 011.jpg
The Cannon 012.jpg
Garage Door Spring
The Cannon 006.jpg
The Cannon 005.jpg
The Cannon 004.jpg
The Cannon 003.jpg
Gas Shock
The Cannon 002.jpg
6-12-08 216.jpg
Type II PVC Back Plate
6-12-08 214.jpg
UHMW Piston
6-12-08 213.jpg
4" sleeve
6-12-08 212.jpg
Last edited by LynyrdSkynyrd on Mon Jun 30, 2008 12:09 am, edited 6 times in total.
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Unread postAuthor: starman » Thu Jun 12, 2008 7:41 pm

Man, that is a full size shock. Somehow I thought you were talking about a pneumatic hood lifter from earlier. I loved the slow return of the barrel after the recoil.

Even with the recoil system the unit still jumps back some on the ground. I see you're trying to brake it some there...maybe some stakes in the ground or something?

Have you tried shooting anything other than water?

Nice job on this! You've got a couple of bad boy pistons there... :)
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Last edited by starman on Thu Jun 12, 2008 7:44 pm, edited 1 time in total.
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Unread postAuthor: jook13 » Thu Jun 12, 2008 7:43 pm

awesome! well made. the recoil system is especially nice. have you destroyed anything yet? gonna get pictures if you do?
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Unread postAuthor: LynyrdSkynyrd » Thu Jun 12, 2008 7:51 pm

right now all we've been doing is water b/c of the location. but hopefully tomorrow we can get some other shots in
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Unread postAuthor: VH_man » Thu Jun 12, 2008 7:54 pm

wow... i think you could proboably use a bigger barrel on that.... is that 2 inch or is the probable 6inch chambers throwing off my judgement.....
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Unread postAuthor: LynyrdSkynyrd » Thu Jun 12, 2008 7:58 pm

lol yea, that barrel is the shortest we got. It's a 3" barrel by like maybe 6 ft.
and yes the chambers are 6".

we have a golf ball barrel, a 2.5" barrel for tennis balls and beer bottles :lol: , and a 1.25" barrel for steel bearings :twisted:
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Unread postAuthor: VH_man » Thu Jun 12, 2008 7:59 pm

1.25" steel bearings!!!! damn.... your gonna need something good to shoot that at.......

haha compared to the chambers the barrel looks like 2 inch...... that really puts the size of this cannon into persepctive.
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Unread postAuthor: Mitchza89 » Thu Jun 12, 2008 8:05 pm

:shock: Dear sweet f^%k that's one of the biggest piston gun's I've seen...

I take my hat off to you good sir...

:shock:
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Unread postAuthor: Davidvaini » Thu Jun 12, 2008 8:08 pm

yeah water will defiantly add a lot of recoil to any gun.
looks good and I like the name. The tanks should be called whoppers because they give this beast one giant blood clot (coagulation)
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Unread postAuthor: potatoflinger » Thu Jun 12, 2008 8:09 pm

Wow, that is a nifty cannon you have there! I love how the pressure gauges are mounted in the wood frame, and the recoil system. This could quite possibly be my new favorite cannon on this site!
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Unread postAuthor: DYI » Thu Jun 12, 2008 8:27 pm

Now that thing's impressive. It isn't very often that we get a really good launcher posted around here. The two 3" porting valves would be equal to roughly 4.2" of flow. And great job on the pistons. It's nice to see something that doesn't look like it was thrown together in 2 days once in a while.

But please, please get a longer barrel. The current situation is a terrible waste of power. At anything resembling an efficient C:B, this thing should have at least 20' of 3" barrel. 20' of 4" would be just slightly on the long side, but you'd get amazing power out of it.

Also, why is the backplate PVC? Wouldn't the UHMWPE you used in the piston be a safer backplate material? Even ABS or polycarbonate, both of which are dirt cheap, would be a much safer material for that part.
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Unread postAuthor: LynyrdSkynyrd » Thu Jun 12, 2008 8:35 pm

well we used UHMW for the piston for its self-lubricating properties and sometimes its not too friendly for machining, so we used the type II PVC basically b/c it is impact resistant and easier to machine.

...And yes we do have longer barrels. The one thats on there was just for testing.

LynyrdSkynyrd wrote:we have a golf ball barrel, a 2.5" barrel for tennis balls and beer bottles :lol: , and a 1.25" barrel for steel bearings :twisted:


and each one of those is at least 15 ft.... and they are that short just for ease of transportation.
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Unread postAuthor: iPaintball » Thu Jun 12, 2008 8:44 pm

Amazing job man! This is one of the best cannons I've seen in a while! I cant wait to see what that thing will do with a longer barrel! The recoil absorber spring is a great addition to this beast. Again, excellent work!
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Unread postAuthor: clide » Thu Jun 12, 2008 10:11 pm

Great job on the gun. That is the best recoil system I've seen on a spudgun.

Although you may consider trying to add some bracing directly behind the tee that the barrel attaches to. With PVC guns it is usually a good idea to support the recoil in the most direct manner possible.
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Unread postAuthor: LynyrdSkynyrd » Fri Jun 13, 2008 12:34 am

THats a good point. I'll probably figure out a brace out of some angle iron or something.
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