Nippon Suisan Gakkaishi 68 (6), 843-851 (2002)

Hydrodynamic characteristics of crank bait lure changed by the aspect ratio of the lip


Department of Marine Science and Technology, Tokyo University of Fisheries, Minato, Tokyo 108-8477, Japan

Flume tank experiments were conducted to clarify the relationship among lip shape, sinking force, drag and center of pressure for crank bait lures. The experimental lure-lips were made up with the same area and with different aspect ratio (λL=0.3, 0.5, 1.0, 1.5, 2.0) in the plane view. Sinking force, drag and moment of the model lures were measured with the six components load cell in the flume tank. Drag coefficient did not change significantly with a different λL. When the aspect ratios of the lip λL were changed from 0.3 to 2.0, the maximum sinking force coefficient was increased from 0.55 to 0.82. Here, the center of pressure coefficient Cp was decreased and the center of pressure moved toward the front of model lures at the same attack angle. From these results and a viewpoint of the lure design, the diving depth and the ratio of sinking force to drag can be increased by enlarging the aspect ratio λL within the range of 0.3≤λL≤2.0.

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