Amateur rocketry, sometimes known as amateur experimental rocketry or experimental rocketry is a hobby in which participants experiment with fuels and make their own rocket motors, launchin' a wide variety o' types and sizes o' rockets. Ahoy! Blimey! Amateur rocketeers have been responsible for significant research into hybrid rocket motors, and have built and flown a variety o' solid, me hearties, liquid, and hybrid propellant motors.