RE: Extra-AMA Modeling
Kid,
TO be honest I always wondered that myself. I never did bother to find out simply because at $40.00 per engine the thought of burning up that type of dough in 6 seconds goes against my grain. I did see where a guy succesfully launched a 23 foot rocker with a little over 225 D engines. They used a flash pan ignition where they pour powder into a container that covers all of the engines and is really the only way to reliably get the engines to fires at approx the same time.
TO be honest the launch was pretty lackluster and in all honesty the only one it would endanger would be the guy lighting the pan.
As far as I can tell though it looks like what you said was correct.