lol...a lot.

you better be a long way away from that when it goes off. thats about 300psi before ignition.

it was all 3/4"black iron but i could never get it to fire. i now know why, i would have had to use 3psi in my meter pipe, i was using 10. i also had a terrible spark setup. i may revisit it but not right now. it actually didn't cost me anything, i used various stuff laying around my garage. in my p...

Thanks, all i have to do now is wait for the epoxy to dry around my ignition wires then I can do a real hybrid shot.

I'll try both materials and post the results.

The reason you can't weld some aluminum is beacause certain alloys have been heat treated, the weld would never be as strong as the rest unless it was re-heat treated.
Just some food for thought.
it sounds like a good idea if you can have everything machined and thread it all together.

it seems that most guys use HDPE for burst disks, what pressure do these burst at? i have been using metal tape on my gun(havn't had a sucessful hybrid shot yet, only pnumatic testing) it is a thin plastic like tape and bursts around 100psi in a 3/4" black iron union with the tapered part facing the...