More info at: facebook.com Since I wasn't able t' buy an altimeter yet, I decided t' build a simple electronic delay timer. Begad! T' video demonstrates how it works in principle. Aye aye! For use in a model rocket, just replace t' LED with a low current igniter. If you need t' use a high current igniter, shiver me timbers, just use 2,3, shiver me timbers, (or as many as you can), 9V batteries, in parallel.