I think at agreed upon C:B ratios are:
0.7:1 for the most power when the chamber is constant
~1.3:1 for the most power when the barrel is constant.

But if nothing else, you can't go wrong with around 1:1

Can you explain this further? What do you mean when saying one or the other is "constant ...

So I would want a larger volume (i.e. more fuel) to compensate for the cooling effect?

So some of you may have seen that I'm working on a new cannon, and I started to wonder if I could simplify the design a little by making a coaxial design combustion cannon, So I started running some numbers and here's the reults of some math in xcell.
http://i.imgur.com/BpvPB.jpg
you can see in ...

This will be gas powered, I'm not interested in syringing fuel in, I want it to be a little mechanically complicated (cool factor) and quick and easy.

I don't plan on banging it around but, I am trying to asses risk since to my understanding PVC shatters while ABS ruptures, I know the PVC is rated ...

Hello all

This may be a little long but I greatly appreciate any help you can provide.

So my friends and I have played around with our spray spudguns since highschool, it’s been years since mine was out and this past weekend one of my friends brought his out and I had forgotten how much fun they ...