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