I was definitely planning on using PVC for this because of its cheapness and availability. I also have a large steel tube that the whole thing is going to slip inside of just in case of explosion. I also plan to have a wireless detonator so I can be way far away from the thing when it fires.
Safety first!
I used propane for a while, and while nicer than hairspray, it just doesn't have as much bang as I would've hoped. This hydrogen combustion/compression hybrid should be quite a bit of fun.
Also, progress on the electrolysis rig is good, I have acquired the mesh from a friend.
Here are the endcaps I have made thus far. This constitutes most of the work on the electrolysis setup.
