| 摘要 |
<p>On the hull of wind-driven or power-driven nautical crafts, sailboard and surfboard, one or a plurality of crenals (1, 2) are cut out in the hull and delimit cavities (3), the apex being directedtowards the front of the hull. These grooves or steps, with a complex profile, are intended to reconduct and reuse the oppositional air-water volume under the hull, thereby causing a spontaneous decompression in order to improve the resistance areas which oppose the forward motion of the float. The crenals have a function of rigidity distributed throughout the surface of the hull, anti-centerboard plane improving the navigation. In certain conditions the flat hull with curved, parabolic or angular grooves or steps allows to navigate without centerboard and without fin, the crenals assuming their functions.</p> |
