A class of non-professional rocketry beyond HPR. Although some consider this term synonymous with Amateur Rocketry, it generally has a somewhat different connotation. Experimental Rocketry normally implies the use of composite solid fuels (such as AP, AN, and sugar motors) and hybrids. Although some clubs and launches operate outside of the TRA, most organized Experimental Rocketry is performed at TRA-sanctioned launches and follow the Tripoli Research Safety Code. Because making your own propellant is potentially dangerous, people who enter this field should study and understand the theory and follow safety precautions. See also Amateur Rocketry