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Pneumatic mortar idea

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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Pneumatic mortar idea

Unread postAuthor: sharpshooter11000 » Fri Jan 13, 2012 2:53 pm

Here's my idea for a pneumatic mortar. I haven't been bothered to make it yet.
The picture is of the shell, it would be dropped into a tube with pretty much the ID of the OD of the shell. The tube would be sealed with a plug at the end and have a firing pin coming through the plug, like a real mortar. The firing pin (should) burst the burst disk and fire the shell.
On the picture:
Green- Foam nosecone
Grey- Plastic body
Blue- Schrader
Red- burst disk
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 13, 2012 3:02 pm

Burst disk attachment? That's the annoying bit...
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Unread postAuthor: sharpshooter11000 » Fri Jan 13, 2012 3:09 pm

Yeah but its the only way I could think of that you could have multiple shells being fired rapidly. :? You could make lots of shells on a lathe and have them all pre-charged. The thing that I'm not sure about is would a pin burst a burst disk with the shell being that light (it would only be made out of nylon or something)?
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Unread postAuthor: warhead052 » Fri Jan 13, 2012 3:11 pm

The pin would be easy to make. Just get a nice long nail, and sharpen the tip even more. Then fill the shell with enough pressure, and the nail should pop it on contact.
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Unread postAuthor: sharpshooter11000 » Fri Jan 13, 2012 3:15 pm

I was thinking something like that, but I wasn't sure if it would pop the disk. What could i use as a burst disk?
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Unread postAuthor: warhead052 » Fri Jan 13, 2012 3:17 pm

Depends, what sort of pressure do you want? And what is this going to be used for? I would say use aluminum foil.
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Unread postAuthor: sharpshooter11000 » Fri Jan 13, 2012 3:21 pm

I don't know what pressure to use, I'm limited to 100psi with my compressor, i was thinking somewhere around that? It would just be used for fun or maybe if I could make a safe enough round for airsoft.
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Unread postAuthor: Petitlu » Fri Jan 13, 2012 3:44 pm

handling a projectile already under pressure is dangerous ...
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 13, 2012 3:46 pm

sharpshooter11000 wrote:Yeah but its the only way I could think of that you could have multiple shells being fired rapidly. :? You could make lots of shells on a lathe and have them all pre-charged. The thing that I'm not sure about is would a pin burst a burst disk with the shell being that light (it would only be made out of nylon or something)?


Use some imagination, here's an alternative. Projectile strikes a pin which exhausts the pilot volume, opening the piston and firing the projectile, after which the valve reseals and it's ready for the next shot ;)
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Unread postAuthor: warhead052 » Fri Jan 13, 2012 3:46 pm

Ok. Well I would suggest aluminum foil then.
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Unread postAuthor: sharpshooter11000 » Fri Jan 13, 2012 3:51 pm

handling a projectile already under pressure is dangerous


Not much more dangerous than a cannon/cartridge under pressure I would think. The projectiles would be properly made on a lathe, and if I end up making it they will have safety caps over the burst disks to prevent accidental firing.

JSR, i thought of something like that but I wanted it to be a simple tube and more complicated shell.

Warhead, Thanks, if I make it I'll use aluminium foil
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Last edited by sharpshooter11000 on Fri Jan 13, 2012 3:57 pm, edited 3 times in total.
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Unread postAuthor: Petitlu » Fri Jan 13, 2012 3:54 pm

projectiles would be expensive to do! :D

Jacks solution is better, cheaper and safer
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Unread postAuthor: sharpshooter11000 » Fri Jan 13, 2012 4:00 pm

projectiles would be expensive to do! :D

:D
projectiles is cheap!
€ 4 to 20! and are easy to do because no O-ring


I can get scrap material for free from a professional machinist and machine them myself. :wink:
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Unread postAuthor: Petitlu » Fri Jan 13, 2012 4:06 pm

heu :

"projectiles is cheap!
€ 4 to 20! and are easy to do because no O-ring"

quotation another post :D
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 13, 2012 4:10 pm

sharpshooter11000 wrote:JSR, i thought of something like that but I wanted it to be a simple tube and more complicated shell


You can always reverse it, have the valve on the shell.

You could probably use a soda bottle and hold a burst disk in the cap for a cheap and cheerful projectile...

Petitlu wrote:projectiles would be expensive to do! :D

Jacks solution is better, cheaper and safer


Definitely ironic considering the other thread ;)
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