ignitor

I am trying to create an ignition system to launch a rocket from a weather balloon, so I need a system that is reliable, lightweight, controlled remotely (via an arduino relay), and can operate down to at least 0ºC. I can (barely) get a piece of 36g Nichrome 80 wire to glow red-hot by shorting...

Anyone have a circuit diagram or experience with a seperate pyro battery set up for missileworks components? I have a PET2 timer and I want to airstart my second stage with an Aerotech J500. I bought some Wildman Big Uns to test which should be ignitable using the timer only, but I'd like to...