Used to fly the Cox D8-3 a lot in my Mars Landers and 1284 full-stack Space Shuttles.
Just about the perfect motor for them. I'm down to only 3 D8-3s and one D8-0.
All the Cox motors I have are of a 1971 production date. The majority were flown in the mid 80's to early 90's. The last one I flew was in 2005 in a Mars Lander.
Used the Cox D8-0 to CHAD stage various rockets such as the Estes Patriot and Nike Ajax.
Never had one cato either.
Wish we could get those back. Just enough over an Estes C, but not to the level of a D12 or an Aerotech D. I don't think with the modern weaker black powder they would be possible in a 70mm casing. Estes should offer a "long" 18mm motor like they offer a "long" 24mm motor with the E12.

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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, AGITATION, CHAOS, TURMOIL, FIASCOS, AGGRAVATION, INSTIGATION, NUISANCE-ACTION, and HAVOC !