MANY years ago I built a BT-60 upscale of the Estes Wizard with a 29mm engine mount.
I flew it several times on 24mm Estes D12-5's and a few times on Aerotech 24mm E15's and E30's.
It was destroyed on a vintage Composite Dynamics 80n-sec full-F 29mm F45 that catoed on ignition.

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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 !