| Abstract | The DOLPHIN is a self-propelled semi-submersible vehicle that operates under but near to the sea surface; typically one-third of the mast projects above the sea surface. As such, the hydrodynamic performance of the complete vehicle is affected by the hydrodynamic performance of the mast. The purpose of the mast is two-fold: to act as a streamlined fairing for the snorkel for the air-breathing Diesel engine, and to support the antenna that is used for communications with the vehicle. This paper examines the effect of the mast on the hydrodynamic performance of the vehicle and shows what improvements might potentially be possible through the use of an alternative design of mast. The results presented are from captive-model towing tank experiments with a half-scale model of the DOLPHIN. Two mast configurations were examined: the original mast: and an alternative mast that includes near-leading-edge air ejection from the upper half of the mast, and a 25-percent-chord trailing-edge flap on the lower half of the mast. |
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