What, exactly, is a “model rocket” versus a “high power” rocket?
Model, High Power, and Amateur are all terms which have many definitions, depending on to whom you are speaking. In the Usenet newsgroup rec.models.rockets and in the FAQ documents the definitions (if any) accepted by the NFPA, National Association of Rocketry, and Tripoli High Power Rocketry Association are used. If these definitions conflict the NAR definition is used. Model Rockets are rockets that conform to the guidelines and restrictions defined in the NFPA 1122 document. These rockets weigh less than 1500 grams, contain less than 125 grams of total fuel, have no motor with more than 62.5 grams of fuel or more than 160 NS of total impulse, use only pre-manufactured, solid propellant motors, and do not use metal body tubes, nose cones or fins. Large Model Rockets is a term used in the FAA FAR 101 regulations. It refers to NAR/NFPA model rockets that are between 454 and 1500 grams (1 to 3.3 pounds) total liftoff weight or contain more than 113 grams but less than 125 grams of total
