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Multi-Shot Missile La

A place to ask general spud cannon related questions.
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Multi-Shot Missile La

Unread postAuthor: The Law » Wed May 30, 2012 12:43 am

Hi everyone, I'm new to air cannon building and I was hoping that I could get some good input on my design. Although I do have Inventor on my computer, I'm new to it as well so I'll try to describe it to you the best I can. So this cannon needs to accomplish a very specific goal because It will be used in Milsim airsoft games as an RPG since I am my squad's combat engineer. Aesthetically, it will look like a Carl Gustav launcher. It will need to shoot a nerf vortex ball/missile at least 100 feet and will operate off of compressed air. Here's the catch: I want at least three shots before having to refill the air. I plan to hold the air in a used fire extinguisher cytlinder at about 100 psi. The cylinder is linked to a pneumatic quick release with a male and female end like what you would find on a pneumatic tool and hose. This will allow for quick cylinder changes. This links to a pressure gauge and then to the first ball valve. After this ball valve there is a 5"longx3/4" piece of pipe followed by another ball valve. The two valves will act as a primer and release therefore giving it multi-shot capabilities. After this chamber is the barrel of the gun. The biggest draw back I think is that after each shot, the overall psi will decrease significantly. Do you think that I would still be able to attain 100 feet with each shot? I appreciate any input.
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Re: Multi-Shot Missile La

Unread postAuthor: jackssmirkingrevenge » Wed May 30, 2012 1:01 am

In terms of performance, something like this will give you the performance you're after: http://www.spudfiles.com/forums/second- ... 14735.html


As to making it a multishot, look into slide valve piloting for the valve instead of the blowgun in the example above:
http://www.spudfiles.com/forums/semi-au ... 23626.html

The idea is that you have two chambers, a main reservoir and a firing chamber. If you're worried about consistency, you can have your main chamber at say 150 psi, then connect it to the slide valve via a regulator taking the pressure down to say 60 psi.

There are other alternatives you might want to explore, such as a preloaded cartridge - you can make several and they will always give you the same performance. Here's one way of making them:


If you're allowed a combustion launcher, they can be even simpler, just a tube closed off at one end. Imagine something like this, that can be loaded into a breech: http://www.spudfiles.com/forums/clear-c ... 22067.html

If you want to stay pneumatic and go even simpler and high performance, go valveless ;)


In short, there are many solutions to your specifications. What you chose depends on the extent of your technical abilities, material and tool facilities and budget.
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