Turning maneuver limitations imposed by sudden strut side ventilation on a 200-ton 80-knot hydrofoil craft

Predictions of turning characteristics of an 80-knot hydrofoil craft performing ordinary coordinated turns indicate that, in principle, sudden strut side ventilation will limit craft maneuverability only if large turning rates are attempted in a seaway. A six-degree-of-freedom computerized simulation of a 200-ton craft performing coordinated turns in calm water indicated no danger of sudden strut side ventilation providing the control system is properly tuned to produce essentially zero strut yaw angles with respect to the flow at the maximum craft speed.