0.25, the deepest retrieving depth was recorded with 20°~40° of the attack angle.
Both the flume tank and the field experiments were carried out to clarify the relationship between tied-eye position and retrieving depth of crank-bait lure. Trial lure with adjustable tied-eye position were made and were used in both the experiments with 40, 60 and 80 cm/s of retrieving speed. Diving depth, tension on a towing line and attack angle of the lure were measured in the flume tank. Diving behavior of the lure was investigated within 20 meters retrieving course in the field experiment. Coefficient (Ct) was indicated as the ratio of the distance (d) between the lip tip and the tied-eye position to the overall length (L0) of the lure on the plane figure. In case of Ct 0.25, the deepest retrieving depth was recorded with 20°~40° of the attack angle.