Definitely an interesting kit. Just make sure that both boosters light on the pad. During the last flight of my PSC Infinity, only one booster lit on the pad, but somehow all four motor were burnt when the rocket was recovered. The unlit booster was ignited from the front end. I have not used any extra tape on the booster motors other than the cellophane tape on the booster-upper stage motor joint.
Yow, that had to be an ... ummm... 'interesting' flight profile for the booster stage. Heck, for the whole rocket!!
:y::y::y:
Just guessing, things would have to have gone something like this (assuming C6-0/C6-7 motor combo -- fractional-second times are only guesstimates):
Elapsed time 0.00: Motor 1A ignites, 1B does not.
Elapsed time 1.68: Motor 1A burnout/blow-through
Elapsed time 1.683: Motor 2A ignition, stages separate, exhaust flame of 2A directed against top of booster stage
Elapsed time 1.7: Motor 1B ignites at top end when exhaust flame of 2A enters
Elapsed time 1.73: Undirected "reverse thrust" flames from top end of 1B directed against tail end of sustainer stage (separation distance at this point is still only a couple feet)
Elapsed time 1.75: Motor 2B ignites when undirected 'reverse exhaust' from 1B enters its nozzle
Elapsed time 1.9: Motors 1B and 2B reach max thrust. Sustainer now separating rapidly from booster. Booster stage continues wild pinwheel flight with Motor 1B burning "in reverse" with huge thrust (due to full-surface ignition of fuel grain).
Elapsed time 3.4: Motors 1B and 2B burn out. Rocket coasts to ejection at approximately 10.4 seconds ET.