Basic Development of Wing-In-Surface-Effect Ship of a New Configuration with High Seaworthiness

在四年计划的最后一年，我们充分利用我们的研究成果，在鸟取大学建造了一个大比例尺模型，在广岛大学建造了一个带外翼的模型，并进行了试验。大比例模型长7.2米，宽5.0米，相当于一艘真实的双座船的大小。我们通过无线电控制模型实现了一系列超过1,500米的稳定飞行。这就解决了地效翼船鸭式布局的基本科学技术问题。通过带外翼的模型，发现外翼减小了气动力中心随高度变化的偏移。它们还可用于增强侧倾稳定性。在横滨国立大学，利用鸟取大学的小型模型进行了高速水池试验，并在带鸭翼的S形机翼上继续进行了精密风洞研究。结果表明，鸭翼对增加俯仰稳定性有很好的效果，但对增加升力的贡献不大。在此基础上，进行了船舶在垂直水面平面内的运动仿真。计算结果表明，该艇具有良好的巡航飞行性能，并采用CFD方法计算了艇底喷雾，得到了作用在船体底部的水动力。这些力与现有的实验结果在性质上相似，但在数量上不太一致。

In the last year of our four year project we constructed and tested a large scale model in Tottori University and a model with outer wings in Hiroshima University making full use of our results. The large scale model is 7.2 m long and 5.0 m wide, which is the size of a real ship for two seats. We achieved a series of stable flights over 1,500 m by radio-control of the model. This means that basic scientific and technical problems of the canard configuration of the Wing-In-Surface-Effect ship are cleared. By the model with outer wings we found out the fact that the shift of center of aerodynamic force with change of altitude is reduced by the outer wings. They are also useful to enhance roll stability. In Yokohama National University a high-speed water basin test was conducted using a small scale model built in Tottori University.Research on precise wind tunnel was continued on the S shaped wing with a canard. The result showed that the canard was very effective to increase pitching stability, but had small contribution to increase lift. On the bases of these aerodynamic researches we conducted a motion simulation of the craft in the plane vertical to the water surface. The result showed a good performance of the craft in its cruising flight.We also developed a CFD method to calculate spray from the bottom of the craft, and obtained hydrodynamic forces acting on the bottom of its hull. These forces had qualitatively similar characters to those of now existing experimental results, but quantitatively insufficient coincidence.