Effectiveness test o' control surfaces. T' first part o' t' fly is made with fins deflected t' +9° (to reduce spontaneous rolling), shiver me timbers, at 0:32 fins were deflected t' -9° t' see t' response o' t' rocket. Avast, me proud beauty! Data collected in this test are necessary t' design t' roll control system. See you on t' next video for t' real roll control system!