Using two hard chine boat models, a torpedo boat with broad span and a passenger ferry with narrow span, fundamental data related to roll instability is obtained from static and dynamic inclining tests and roll tests in waves. The value of GM is confirmed to decrease when transversely inclined by hydrostatic calculation and inclining experiments in calm water and in steady flow. The broad spanned boat is obtained to be more advantageous at high speed. The wave analysis is conducted to get wave spectrum and wave pattern resistance for inclined hulls. At the same time wave pattern transverse force is calculated by Kotchin's formula. Furthermore wavelet transform is adapted to the wave analysis and the positions at which wave resistance and transverse force act are presumed. Wave test for inclined hull is conducted in order to simulate turning in wave. Roll amplitude increases in proportion to mean inclining angle. With respect to roll at high speed the broad spanned boat is also more advantageous.%高速艇において横揺による不安定性を改善するためには、GM 値を上げればよいと言われている。通常の排水量型船舶ではヒー ル角によりGMはほとんど変化せず、安定性と快適性を満足 するようなGM値になるように決めるのが普通であるが、高速 艇については横傾斜することによりメタセンタ高さが減少するこ とが知られており、余裕を取って高めに設定している。
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