Amateur rocketry , sometimes known as experimental rocketry or amateur experimental rocketry , is a hobby in which participants experiment with fuels and make their own rocket motors, launching a wide variety of types and sizes of rockets. Amateur rocketeers have been responsible for significant research into hybrid rocket motors, and have built and flown a variety of solid, liquid, and hybrid propellant motors.
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Hobbyists were no longer dependent on dangerous packed-powder mixtures that could be delicate and unpredictable in handling and performance. One of the first organizations set up in the US to engage in amateur rocketry was the Pacific Rocket Society established in California in the early s.