Because it will be like the camp, and i don't want yo return home to get fuel for my gun. I will be in the forest? near the river, and i need to make the fuel on the place. So propane with oxygen will be tho most powerful gas, or hydrogen. And i have metall pipes, so what i need to do with them? Buy...

Thanks. And how about ignition? I've made some tests. In a bottle it's burning pretty good. But in closed chamber? *** I've made two guns. One mini, my first, than bigger. I used hair spray. Now i'm thinking about using something like this http://www.spudfiles.com/forums/advanced-hydrogen-mini-combu...

Sorry, i'm a noob here, and most suitable fuel for me is hydrogen + oxygen. Is it possible? Or gun would be blown up? I can't get propane or right hair spray. But water and electrolysis system. P.S. Sorry for my bad english.