A fluid foil has a fixed main portion 3 with a moveable tip 11 mounted at one end, both portions having upper 12 and lower surfaces. The foil is operable from a first configuration (fig.3), where the tips upper surface is angled downwardly with respect to the main portions upper surface, into a second configuration (fig.4), where the upper surfaces of both portions are continuous surfaces; the tip is exclusively passively actuated to rotate upward by movement of the foil with respect to a surrounding fluid. A third configuration (fig.4) may angle the tips upper surface upwardly. The tip may remain in its downward position when forward motion of the foil through the fluid is below a predetermined forward speed; to reduce a taxiing/stationary aircraft’s wingspan, for example. Preferably, the tip is mounted by a hinge or flexible element 16, biased towards the downward position using a spring, which imparts a variable force as the tip is rotated upward, and/or under its own weight. The tip may rotate about a pitch axis so that its angle of incidence reduces as it rotates upward. The tip may include one or more fixed or rotating secondary lifting surfaces (fig.12a,31).


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    Title :

    Passively actuated fluid foil


    Contributors:

    Publication date :

    2019-06-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B64C AEROPLANES , Flugzeuge / B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / F01D Strömungsmaschinen [Kraft- und Arbeitsmaschinen oder Kraftmaschinen], z.B. Dampfturbinen , NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES / F03D Windkraftmaschinen , WIND MOTORS



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