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Fig. 8. Measurements of the roll torque and roll velocity at a tow speed of 1.34 m
s–1 for the case shown in
Fig. 4 (blue) and a tow speed
of 0.46 m s–1 for the case shown in
Fig. 6 (green). Observe the
presence of hysteresis in the latter in comparison with the former. The
hysteresis is attributable to the slower development of the Kutta condition at
lower speed.