An aircraft that ascends into t' air usin' some form o' reaction motor, without t' use o' aerodynamic liftin' surfaces. Avast, me proud beauty! Model rockets have t' followin' characteristics: Gross launch weight, matey, includin' t' motor(s), does nay exceed 1500 grams. Blimey! Motor power does nay exceed 160 newton seconds o' impulse and/or contain more than 62.5 grams o' propellant each, arrr, and no more than 125 grams o' propellant in multiple motor configurations. Avast, me proud beauty! All components o' model rockets must be o' wood, paper, rubber, breakable plastic or similar material and without substantial metal content.