It looks like this may be violating the forums rules, as it contravenes the section on explosive materials, but the information is linked, not directly posted, so it should be OK.

Hello all. I'm not too sure that this is in the right palce, but i have found a PDF regarding combustion-driven vortex cannon research, and it looked interesting, so I thought I should share it. Vortex cannon. Sorry if it's posted already. Enjoy :) Edited by jrrdw. Cannons built using this PDF shoul...

Many thanks, R&D it is for me ahead. I feel that this is the most enjoyable part of the whole cannon-building exercise, tweaking the countless variables to ascertain precisely which combination yields the furthest shot, the fastest shot, the most accurate shot. And, since I now have a rough estimate...

Well, thanks to all for the speedy replies. :) To summarise: even if the burst disc does not burst, there will be no dangerous rise in pressure once the gases cool. So, will any noticeable performace gains be experienced if the disc bursts at 90PSIG as opposed to 100PSIG? And if there was no burst d...

Hello, I am back, and I am finally going to complete my advanced combustion that I have been working on for the last... well... forever, really... Shortly my potatoes shall fly. (hopefully :)) I just have a quick question: I am wanting to power my advanced combustion with Butane gas. At the optimum ...

Thanks all for the replies. Just to clear something up, I'm not in Europe, the pic was a bit misleading, I'm actually in South Africa. The cylinder I'm using is pure butane. (The pic is a bit inaccurate, the cylinder I have is different.) OK looks as if I'm going to buy another length of pipe. The w...

Hello all, I'm new here, and, if no one minds, I'm gonna ask a few questions about my first ever combustion. (Sorry about the metric units, but it isn't too hard to convert) First off, the gun is going to have a barrel made from an as-yet-undetermined length of 63mm dia. PVC. The PVC is pressure rat...