I launched my Aerotech Arreauxbee-HI a couple of weeks ago on a F52. Beautiful flight up, but the down part was ballistic. Altimeter said I hit 1500ft. I watched it hit apogee, come over a bit, saw a puff of spoke, but the rocket did not separate. So, I recovered the rocket (many pieces) and checked the motor assembly (only piece still together besides my Estes Altimeter which survived!) for residue of the ejection charge, and yes, it did fire. Parachute and shock cord in perfect condition. So, I pulled out the MM to inspect the baffle and "pot scrubber". The cooling mesh came out with residue on it, but it looks like it was only 5" long, not the recommended 6". Just scratching all this up to a lesson learned. I started thinking about how to ground test, and am coming up short. Is there a way to ground test an MPR motor deploy with a 29/40-120 case? Do I buy some delay kits (one's for the motors I want to use), black powder and a bunch of igniters? I looked up the specs for the F52, F40 and G53 and it looks like AeroTech puts in .7g of powder. So I went to calculate 10psi on a 2.6" tube and the max length of tube it can pressurize is 25", assuming all the black powder burns. I'll take any advice I can get on how to ground test without burning up a motor.