Usually, a lengthened version o' an existin' model rocket design, me bucko, used in altitude and duration competition. Scorin' is based on altitude multiplied by airframe length. Ahoy! Super-Roc has different length limits for different motor classes. Begad! For example; A has a range o' 75 t' 150 cm, C has a range o' 125-250cm. Avast! T' rockets can be longer but t' excess length is nay counted into t' length factor. In t' altitude category t' rocket may be recovered in more than one section.