Abstract
As an important accessory of single trawl, otter board directly affects net horizontal expansion, further the catching and fishing efficiency[1-2]. For improving the fishing efficiency and technology level and solving the world energy crisis in some way, the hydraulic performance is chosen and the effects of different structural parameters are studied. Such as aspect ratio, curvature, bending and receding angle, deflector angle and slot width, number of slots and so on[3-10]. This paper selects a vertical cambered slotted otter board as research object, presents a principle of hydrodynamic efficient based on the experiment data, then a mathematical model of the hydrodynamic efficient is obtained. This model has been found as a function of angles of attack and deflector, and is suitable for similar otter board design and optimization.
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