Which of the following engines do we need the most in the Single-Use black-powder engine lineup from ANY manufacturer ?

Maybe some manufacturer that reads these forums will LISTEN and produce something we are actually ASKING FOR.

1) B14-x (18mm)
2) D30-x (24mm)
3) D8-x (18mm like the old 13n-sec Cox D's, not an oddball 20mm)
4) A8-0 (18mm)
5) 1/2A3-0 (13mm)
6) C5-x (18mm)

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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, and HAVOC !