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Copper Pneumatic Air Cannon

Step 3Preparation

Preparation
As you have probably noticed my gun as a single strip of chamber, with 2 "branches" to stabilize it. It is an over-under design. The total length of your stabilisers will need to be a bit longer than your upright bit. The longer the stabilisers are, the more stable your gun will be.
A good chamber:barrel ratio by volume 1:2, however you can change this to suit your needs. A gun with a barrel which is either too long or too short will not be more powerful, but rather less. Don't forget to include all the pipe including the stabilisers in your volume estimation.
You can use the Gas Gun Design Tool Tool to find out this length. The ".GDT" file is the saved data for my gun.
After you have cut the pipe to the size you want , you must remove the burrs, as these will hinder your soldering. The cut needs to be clean and straight.
mini1co2.gdt475 bytes
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Author:Biopyro