The D21/24 is a great motor for "draggy" 18mm powered rockets such as this, the Mars Lander, 1284 full-stack Space Shuttle, Galactic Pirates, Centuri Orion, etc.

I wouldn't try the D10/13 either.
It supposedly works in the Mars Lander, but I have only used the D21/D24 in that one too.

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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 !