Atlantic 21 inshore lifeboat developed by RNLI from a design originated at Atlantic College, South Wales. Hull, flat-bottomed for beaching, is marine ply or grp with inflatable topsides. Console seat for crew of three contains radio. Speed about 29 knots: radius of action, about 50 miles. Roll bar aft gives protection for crew if she capsizes and houses buoyancy bag which crew can operate to right her..