A well established term in the rocketry hobby which refers to a person who realizes hobby rocketry is just that, a hobby. A knob isn't planning on going to the moon anytime soon, and has no trouble playing with toy rockets. A knob doesn't mind rocket motors that are less then 100% effecient, as long as they have some sort of cool visual effect.
Wow, that guy that flew the green flame motor is a real knob!
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