How do I work out the flow reates of valves and whats suitable ???

Tht very helpful. The most appealing bit in all that is the quick exhaust valves. It sounds like it would suit my application. Have you ever had anything to do with them??

That is a very nice design.

I really want a pneumatic. I dont live in a location allowing me to fire a combustion. I understand the basics on how they all work but I have not seen anything that looks similar to what I want to make.

Im new to all this but very interested. I would like to make a pneumatic spud gun.I want to make a small one,about 700mm long. I want it to fire proportions of potato and plasticine. I want to run fairly low pressure as it will be used indoors.I want to make it like a replica rifle. Has anything lik...