ANY 4" (BT-101) rocket SHOULD fly on at least an F !
Less than that is a Pipsqueak LOB of a flight.
We are launching ROCKETS, not mortars.

The most dismal flights I have ever seen are Scale Estes "Maxi-Brutes" on D12-3's.
Absolute JOKE.
Those should have a MINIMUM of a 2x24mm cluster if flying on 24mm Estes D's and E's.

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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 !