The Compound, Palm Bay, Florida, Spaceport Rocketry Assoc
At separation between first and second stage, second stage ignited and then blew up, and ignited stage three, almost simultaneously, which ejected propellant and nozzle.
I took the date information from another motor I "assume" is from the same batch but I do not know for sure. The third stage motor was an E9-4 with code as follows: A 07 14 17.The uploaded picture is of the rocket on the pad, but there is a video that shows what happened. I have other pictures n other medium of the rocket "remains," which have since been rebuilt..