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