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    • 7. 发明授权
    • Deformable shrouded water foil
    • 变形的覆盖水箔
    • US4538539A
    • 1985-09-03
    • US591504
    • 1984-03-20
    • David E. Martin
    • David E. Martin
    • B63B41/00B63B3/38
    • B63B41/00B63B2035/009
    • An underwater appendage for sailboats, such as a keel or rudder, is fitted with an external shell-like shroud, which is placed around a core portion of the appendage such that the outer shroud forms a deformable water foil which is fastened on both sides of the core near its rear or trailing edge, and which shroud is everywhere else spaced away from the core. This deformable shroud forms a hydrofoil, the leading edge of which can be displaced to either side of the core by means of inflatable bladders placed on either side of the core, thus creating a desired angle of attack for the deformable foil, either to port or starboard. Inflation of the bladder on the windward side of the boat creates an angle of attack to windward and also a bulging of the shrouded water foil on the windward side creating the desired hydrodynamic lift to counter the lateral component of the aerodynamic force on the sail. As the boat is turned through the wind, onto the opposite tack, the pressure on the bladder is relaxed as it becomes the leeward bladder, and pressure on the opposite bladder is increased as it becomes the windward bladder. Pressure on both bladders can be relaxed when no lift is desired as when running before the wind.
    • 用于帆船的水下附件,例如龙骨或方向舵,配备有外壳状护罩,其围绕附件的芯部部分放置,使得外护罩形成可变形的水箔,其被紧固在 靠近其后缘或后缘的芯部,以及哪个护罩在其他地方与芯部间隔开。 该可变形护罩形成水翼,其前缘可以通过放置在芯的任一侧上的可充气气囊移动到芯的任一侧,从而为可变形箔产生期望的迎角, 右舷 膀胱在船的迎风侧的膨胀产生迎风的迎角,并且在迎风侧产生被覆盖的水箔的凸起,产生所需的流体动力升力以抵抗帆上的空气动力的横向分量。 随着船转过风,在对面的大腿上,当膀胱成为背风膀胱时,膀胱上的压力就会放松,而相反膀胱上的压力随着迎风膀胱的增加而增加。 当不需要电梯时,在风前行驶时,两个气囊的压力都可以放松。