Cooperative Research on a Semi-Displacement High-Speed Boat.

对某高速半排水量艇进行了阻力测试。这项工作是国际贸易委员会海上高速车辆委员会任务的一部分。通过对试验数据的分析，得出以下结论：在波浪阻力中没有发现尺度效应，而在修剪和喷雾观测中则出现了尺度效应。即使在高弗劳德数下，摩擦阻力的形式因子也可以通过休斯提出的作为弗劳德数函数的方法来确定。应研制适合半排水量船体的紊流刺激器。在中等弗劳德数范围内，半排水量船型与排水量船型的特点在许多点上是相似的。这意味着ITTC 1978的功率预测方法，经过实际修改，将适用于这种类型的高速飞行器。拖曳方向的影响、湿表面积的变化以及拖曳架的气动效应对该船型的阻力试验结果影响不明显。采用条带法可以估计船舶在波浪中的运动特性。在高速飞行器的机动性估计中，必须考虑姿态的变化。

A resistance test program of a high-speed semi-displacement craft was performed. This work forms a part of the tasks of the High-Speed Marine Vehicle Committee of ITTC.Analyzing the tests data, the following conclusions are obtained. The scale effect is not found in the wave resistance, and on the other hand, it appears in trim and spray observations. The form factor of frictional resistance can be determined even at high Froude numbers, by the method suggested by Hughes as a function of froude number. Appropriate turbulence stimulator for semi-displacement hull should be developed. The characteristics of semi-displacement hull forms in the range of medium Froude numbers are similar to those of displacement hull forms in many points. This means that the ITTC 1978 power prediction method, with practical modifications, would be applicable to this type of high-speed craft.The effect of towing direction, variation of wetted surface area and aerodynamic effect due to the towing carriage do not make noticeable effects on the results of the resistance tests of this hull form.Craft motion characteristics in waves can be estimated by applying a strip method.In the maneuverability estimations of a high-speed craft, the change of attitude must be taken in to account.