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THE EVOLUTION OF PERFORMANCE BOATS AND CRAFT BEYOND The Sea Striker , a 22 m fast patrol craft, designed by Donald L. Blount and Associates, Inc. and built by RiverHawk Fast Sea Frames, represents the state of the art in terms of high-speed coastal patrol vessels. The Thornycroft 55-ft. coastal motor boat, a single-step planing hull, was developed during World War I and had distinguished military service in the North Sea and English Channel. DISPLACEMENT SPEEDS BY DONALD L. BLOUNT