10V Rocket flight 3, objectives met or exceeded: Smaller fin set t' decrease flex and add stability/ 90 degree set. Avast, me proud beauty! Determine if 1 percent Iron oxide added t' KN0/SB, arrr, would yield higher, me bucko, cleaner burn rate. Rapid ignition o' fuel using12V battery directly at launcher via relay..Idea from Tom Sanders..thanks! Launcher ignited engine as soon as button was pressed. Avast! Co-Pilot v2.0 Dual deployment, from Missile works, fired early... Avast! just one sec after motor burnout, shiver me timbers, causin' chute separation and subsequent rocket body impact resultin' in extensive damage. Designer o' altimeter says me rocket most likely experienced a high speed shock wave right after motor burnout, which set t' altimeter off. Avast, me proud beauty! Further, it was noted that settin' t' 'Mach delay' at motor burnout and a few seconds after would allow altimeter t' disregard this temporary shock wave, elimenatin' premature ejection.