Nothing new here, The main chamber is a 1" steel tee, connected to a 1/2" steel union. ignition is provided by a BBQ igniter. The disc i used was simply two layers of duct-tape, next time i'll use aluminium foil or something else as the pressure might not have been as high as it should have when it popped.
I filmed the shot , but i'll wait til i can get more footage before i post it in the showcase section.
I might also make a little storage with stoechiometric mixes already in, because it's a really pain to get it to shoot. I think my pump has a leak and thus i can't get an accurate reading of the pressure, both propane and air. Stay tuned for damage pics, vids, ultra slow-motion and so on !

until then, take care everyone

Captain out. /