RESISTANCE TESTS OF A SERIES OF CHINE INTERCEPTORS ON A PLANING CRAFT

摘要

Information on chine interceptors, as well as the whole topic of spray sheet deflection, is scarce and to the most extent dated. Therefore, a series of model tests have been conducted with a 19 m craft configured with chine interceptor arrangements (operating in a range of Froude numbers Fr = 0.77 ... 1.35). The series is comprised of two benchmarks and two modifications for each of the benchmarks, altogether 6 models. Each model was tested at four displacements and speeds. The first benchmark, a bare hull, had the following two chine modifications: a 2×2mm rectangular rail attached along the outer edge of the chine and a 2×15mm chine inclination that covered the chine, resulting in a new chine surface angled down. The second benchmark, a hull equipped with spray rails with a rectangular 5×5mm profile, was tested with a rectangular 2×2mm and a triangular 5×5mm profile attached at the outer edge of the chine. Chine interceptors on reduced the total resistance of a planning craft by more than 3% both on a bare hull and hull equipped with spray rails.