What happens when you set the timer delay to 10 tenths of a second instead of 10 seconds. The engine was still lit when the ejection charge blew. Documentation for the MARSA54 flight computer was very vague in it's units. Great computer besides that. First test flight of our rocket for our senior design project for the Battle of the Rockets: http://www.rocketbattle.org/Main.html Message me for any questions on the design and performance. Engine used was a Cesaroni K500-RL (Pro54 Casing) : http://www.pro38.com/ Flight Computers (2 redundant MARSA54s): http://www.marsa4.com/jmla/ Launched on 3/10/12 in Tennessee. Video shot on Droid X2