Chine design. discussion in ‘ what is meant by a ragged chine hull? boat design net does not necessarily endorse nor share the view of each individual post.. Dudley dix yacht design. radius chine plywood boat building (as used for didi 38 "black cat" and others in the didi design range). Radius chine hulls explained . it is possible to build a round bilge steel or aluminium hull without the great time and effort, not to mention specialised experience.