Launched at TTRA monthly event held at Varn ranch, Plant City, FL. "Cinema 3" scratch-built 52" tall rocket from Aerotech parts and one Aerotech G80-7 motor. Very first test of a timer-fired, homemade non-pyrotechnic device (nichrome wire and fishing line) for main chute deployment at approx. 600 feet. Drogue and main parachutes were custom-made by Phylachutes. The rocket contained an Aiptek HD-1 camcorder. Rocket achieved an altitude of 1,006 feet and was recovered safely. The 20# test fishing line snapped at ejection, releasing the main chute prematurely. The siren eventually heard was the timer firing the nichrome wire, which then goes into siren mode. I'll use heavier fishing line next time!