Force and Moment Characteristics of Six High-Speed Rudders for Use on High-Performance Craft,

摘要

Six rudders with a geometric aspect ratio of 1.5and widely varying section shapes were constructed to determine the effect of section shape on the cavitating performance of high-speed rudders. Experiments were conducted in the 24-in. variable-pressure water tunnel at cavitaion indices between 4.0and 0.5and an angle of attack range from -5to +35deg. Section shape had little effect on the lift curve slope or on the maximum lift coefficient. However,the blunt base sections had substantially higher drag coefficients throughout the normal operating range of rudder angles. Rudder stock torque was significantly affected by section shape and cavitation index. (Author)