I like the Estes E16 and F15 29mm BP motors, but an E35 or F40 in the same SU BP format would be far more useful. All it would take is a pintle in the nozzle when the BP core is pressed into the casing. Would be similar to the old C5/B8 18mm motors- "semi" port-burning without the hazard of drilling cores like the old B14. It was easily done in the 60's and 70's...it could be done far easier and more safely now with automated controls. Why it is not done is a bunch of hogwash EXCUSES.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !