| 摘要 |
PROBLEM TO BE SOLVED: To rotate a planing boat such as a sled not easily rotatable only by inkling it in a width direction to form a locus with a large turning radius when inclined slightly and locus with a small turning radius when inclined largely and to glide the boat with an optional turning radius only by changing the inclination angle without high level physical techniques. SOLUTION: This boat has plural arc or oval arc edges with different diameters formed continuously on a bottom. The arm diameter of the edge is large in the center and gets smaller toward an end in the width direction and the edges with small arc diameters touch a gliding face one by one as the inclination in the width direction gets larger.
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