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Fig.8 PKT vs. turning ability indices.
(a)Advance/L vs. PKT
(b) Tactical dia./L vs. PKT
Fig. 10 plots the measured overshoot angles with the spiral loop characteristics from numerical simulation.
Fig. 9 KT vs. overshoot angles from sea-trials.
(a) 1st OVS of 10°/ 10° zigzag test
(b) 2nd OVS of 10°/ 10° zigzag test
Fig. 10 |
Relationship between the overshoot angles and the characteristics of spiral loop. |
(a) Spiral loop width vs. 1st OVS of 10/10 zigzag
(b) Spiral loop width vs. 2nd OVS of 10/10 zigzag
(c) Spiral loop height vs. 1st OVS of 10/10 zigzag
(d) Spiral loop height vs. 2nd OVS of 10/10 zigzag
Although the correlations are reduced by the effects environmental disturbances which are not considered in the numerical simulation, we can still see that the spiral loop characteristics are closely related with the overshoot angles.
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