Estes motors are not large enough. Level 1 requires an H or I class motor, level 2 requires a J, K, or L, and level 3 requires an M, N, or O motor. Once you get the cert you're free to buy and fly as many of that cert level of motor that you want. Prior to obtaining the cert you may only buy one at a time, for your cert attempt.Gotcha. So I just have to build the body and integrate an Estes motor? Then, of course, launch it at some sort of event.