| Abstract | A conventional frigate hullform was modified by the addition of four bow bulbs (herein distinguished from bow sonar domes) and three stern wedges with three different angles. All designs were tested, singly or as combinations of bulbs and wedges, for resistance in still water and three, the basis form and two bow bulb variants, were tested in regular head waves to evaluate seakeeping and slamming behaviour. Worthwhile reductions in fuel consumption are achievable with bulbs or wedges, dependent upon bulb design, wedge angle, propulsion machinery characteristics, and service speed profile. The bulbous bows tested in wave had no important adverse effect on seakeeping, and particularly slamming behaviour. |
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