Chronograph, really, where did you manage to find one of those.

it burns great, however it needs a good spark. you only need a little amount. don't know the ratio, just try little amount. Trial and error
I used with butane and it gave alot of kick

go for it. its sweet. i've done it. got the hydrogen from school. use a far away electric ignitor. and boom. i blew up one gun, too much boom.

using a shorter chamber creates more combustion.
use hydrogen or Acetylene. hydrogen is amazing. only need a little.
hard to get. acetylene easy to get and very effective if you don't mind dying. i don't

no needs a stun gun. in canada they're illegal, so the cheapest ignitor is a lateran lighter. $4.99 at the home hardware

I use lateran lighters the most. cheap, easy to use and effective.
I also use a car ignition coil. I hooked up my strobe light to it and I can
get a 2" spark. the electric igniter works great when I use MPS gas.

butane is much better than propane. it's not hard to get the mixture right at all. I made tool that gives me control to give two shots of butane for 4" gun and 3", so ha