Keel and watercraft driven by wind, comprising such kind of keel

摘要

A keel (1) together with a part (10) stiffly connected with a hull (50) of a watercraft (5) comprises a pivotable part (20) consisting of at least two stiffly interconnected blades (21, 22), protruding apart in the form of the letter V and perpendicular to each other, which are pivotally - around the axis of geometry (100) of the keel (1) - connected with the said part (10) in such a manner that each of the said blades (21, 22) is either optionally pivotable from the vertical into the horizontal position, and vice versa, or held in any selected position respectively. At least one hydrodynamically shaped weight (211, 221) is foreseen at the free end (210, 220) of each of the said blades (21, 22). On the one hand, the keel (1) of this kind insures a dead weight to the watercraft (5), required to maintain its stability with as small a heel of the watercraft (5) around its lengthwise axis (500) as possible, and on the other hand, it enables adaptation of hydrostatic properties of the watercraft (5) to conditions existing each time on an anchorage as well as adaptation of its hydrodynamic properties during the navigation, enabling thus to reduce the hydrodynamic resistance to a great extent and increase the speed of the watercraft (5). In addition, the keel (1) of this kind can be executed in the strength sufficient enough to sustain the weight of the watercraft (5) itself, which in turn enables manoeuvring of the stranded watercraft and optionally also stable supporting of the watercraft on a level or inclined ground, when ashore, and even its aquaplaning at a sufficiently high speed.