The ONLY thing that made the brick-heavy plastic RTF Cox Nike Zeus worthwhile was the 2-stage feature.
That was their only rocket that used their 18mm D8-0 and other booster motors.

I always took a "dim view" of their all plastic RTF rockets and thought of them as real "junkers".

All-plastic is fine for RTF . 049 control-line airplanes. For rockets, not so much.

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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 !