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