9. A Study on Semi-Submersible High Speed Ship with Wings : Its Resistance Characteristics and Possibility

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A semi-submersible displacement-type high-speed ship with wings is studied possibility as a midium-distance transport vehicle. The study is mainly concerned on its resistance characteristics and capability to submerge. The vehicle, called HSV (High-speed Semi-submersible Vehicle with wings) here, is consisting of a main hull, main wings and a strut to support the superstructure. The HSV floats at a certain draft like a conventional ship while it is still, and it submerges when it moves forward due to a downward lift force induced by the main wings. The lift force by the main wings and the submergence depth were measured to be confirmed that HSV could submerge as expected. The wavemaking resistance is remarkably reduced by submerging. The wings contribute to reduce the wavemaking resistance by making the hull submerged and also through the cancellation of the waves generated by the hull. The estimation of the effective horsepower requires about 40,000 PS which is still not actually acceptable. However, it can be expected that the wavemaking resistance is still more reduced by the modification of the hull and wing forms. On the other hand, a half the estimated horsepower was frictional resistance component and an innovative means must be necessary for the frictional resistance to be reduced.
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