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The term hydrofoil craft, as is well understood in the art, refers to Water-borne vessels whose main hull or cargo structure is, during normal operation, supported well above the surface of the water by means of a submerged foil or foils, connected to the hull by one or more normally vertical supporting struts. 1 has a portion of its trailing edge out out as indicated at 16, and in the space pro duced there is pivotelly mounted a flap 18, whose profile may correspond more or less to that of the cut-out section of the strut. Thus, where the term hydrodynamic member is employed herein, this refers either to foil or flap mounted co-extensively with the strut and forming a part of the streamline configuration thereof or alternatively a movable foil which is physically set apart from said strut. 6. A hydrofoil craft comprising a hull, a hydrofoil, a pair of struts connecting said hull and said hydrofoil, ailerons adjustably mounted at opposite ends of said hydrofoil, a hydrodynamic member carried by each of said struts in position to pierce the surface of the water during operation of said craft and being pivotally mounted, said hydrodynamic members having their chord lines deflected angularly from the forward direction of said craft during operation at a predetermined design value of submergence, and connections between each hydrodynamic member and its corresponding aileron to adjust the deflections of said ailerons in accordance with the torques exerted upon said hydrodynamic members and the resultant rotation thereof.

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Dolor torácico y cardiopatía en la edad pediátrica 10. A hydrofoil craft in accordance with claim 6, in which said connections comprise means for increasing the deflection of each aileron in response to an increase in the torque developed by its corresponding hydrodynamic member and the resultant rotation thereof. For example, and as shown, the connection may comprise bevel gears 26 and 23 on the shafts of the flaps and ailerons respectively, and this connection is arranged so that an increase in flap deflection produces a decrease in the deflection f the corresponding aileron. In accordance with the pr sent invention, means are provided for correlating the movements of the flaps 18 and the ailerons 22. Thus, and as has been intimated, matters are so arranged that flaps 18 are slightly outwardly deflected when the foil 14 is at normal submergence, and hence during forward motion they will be subject to a torque about their vertical axes.

The vertical heights of the vertical flaps are such that, with the craft in a normal state of submergence of the main foil, the flaps cut the surface of the water, and matters are arranged so that, when the instantaneous submergence of the craft is that for which the foil system is designed (which condition may be called briefly the design point), the vertical fiaps are slightly deflected outwardly from the straight position. From the diagram, and considering first the case in which the actual submergence is equal to the design submergence, it will be seen that a stable equilibrium is achieved when the flap moment equals the aileron moment (these two elements being coupled for opposite deflectional changes), or when the flap moment line a intersects the horizontal aileron moment line; that is, at point P. The value of strut-flap deflection corresponding to this condition is indicated at point P. If, instantaneously, the flap deflection should too small (for instance), and hence the aileron deflection too large, as compared with equilibrium, the aileron moment will exceed the flap moment, and will accelerate the system in such a direction that the aileron deflection will be reduced until equilibrium is again reached.

In the above discussion, matters have been treated as though changes in submergence occurred uniformly at both lateral sides of the craft; that is, that both struts 12 in Fig. 4, for example, the supporting struts 30 could be provided with upper and lower mounts 32 and 34 between which the vertical liaps 36 are pivoted. It is a principal object of the present invention to provide a hydrofoil depth control arrangement which will operate automatically to maintain the submergence of the main foil at the desired or design level, and such that accidental or fortuitous deviation from this level will be automatically corrected. Such craft offer numerous advantages over other types of surface craft, among which are increased efficiency, speed and maneuverability.

In the operation of craft such as just described, different conditions of air and water, and variations in the forward speed of the craft, result in changes in the effective lift of the foil 14, so that it is desirable to provide means by which the submergence of the foil, and hence the height of the hull above the effective Water surface, may be maintained approximately constant. Supposing now that the actual submergence momentarily exceeds the design submergence, the amount of the flap under water will be increased, increasing the flap torque, and equilibrium will be shifted to point Q on line b. Line b represents the relation when the submergence is greater than design submergence, while line 0 represents the relation when the submergence is smaller than normal. While the invention has been disclosed herein in connection with particular embodiments and specific structural details, it is clear that numerous changes and modifications could be made by those skilled in the art, without departing from the spirit of the invention and the scope of the appended claims.

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Likewise, the main foil 38 could be provided with supports, lugs or the like 40 and 42, between which the ailerons 44 are pivoted as independent foils. A further object of the invention is to provide an arrangement of the above type in which all of the operating parts of the depth control mechanism can be located at or near the main foil and its vertical struts, so that no control mechanisms extending upward to the hull are required. Causas de dolor en planta del pie . 1. A hydrofoil craft comprising a hull, at least one hydrofoil connected thereto, an aileron adjustably mounted on said hydrofoil, a movably mounted hydrodynamic member carried by said craft in position to pierce the surface of the water during operation of the craft, said member having its chord line angularly deflected from the forward direction of said craft during operation at a predetermined design value of submergence and means interconnecting said hydrodynamic member and said aileron for adjusting the angle of attack of said aileron responsive to torque on and movement of said hydrodynamic member to control the submergence of said main hydrofoil.

3. A hydrofoil craft comprising a hull, at least one hydrofoil, at least one hydrodynamic strut connecting said hull and said hydrofoil, ailerons adjustably mounted at opposite ends of said hydrofoil, a hydrodynamic member carried by said strut in position to pierce the surface of the Water during operation of said craft, said vertical member having its chord line angularly deflected from the forward direction of said craft during operation at a predetermined design value of submergence, and connections between said hydrodynamic member and said ailerons to adjust the deflections of said ailerons in accordance with the torque exerted upon said hydrodynamic member.

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5. A hydrofoil craft as claimed in claim 3 and wherein said hydrodynamic member has its chord line deflected inwardly from the forward direction of said craft. 7. A hydrofoil craft in accordance with claim 6, in which each of said hydrodynamic members is pivoted upon a vertical axis forward of its aerodynamic center.

8. A hydrofoil craft in accordance with claim 6, in which said hydrodynamic members constitute movable sections of their respective struts. Dolor lumbar tratamiento natural . Each of the struts 12 in Fig. 2, each flap has a vertical axle or shaft 24, and is connected with its corresponding aileron 22 so that rotation of either flap will also rotate the correspond ing aileron independently of the other. This invention pertains to hydrofoil craft, and more particularly to improvements in the mechanism for achieving proper depth control (submergence) of the hydrofoil. Yet another object of the invention is to provide a depth control for hydrofoils which is especially well adapted for small craft, in which the lift to drag ratio of secondary importance, and in which the simplicity of construction and operation of the control system are particularly desirable. 18 and as are pivoted well forward of their aerodynamic centers; with this arrangement, any failure of the connections or linkages to the ailerons will merely permit them to return to zero-lift condition, so that they fail safe.

It was also stated that for simplicity of the disclosure, the ailerons were considered as pivoted in their aerodynamic centers; however, as a practical matter, these also could be pivoted forward of the aerodynamic center, so that fail-safe operation of the ailerons as well will be achieved. While, for purposes of the present disclosure, the connected flaps and ailerons have been treated as the sole means for control of submergence, supplemental manual or automatic control could also be utilized in conjunction therewith. A connection 46 between flap and aileron, operating as described in the first embodiment, is also shown in this figure. Also, the transmission ratio of the gearing or connection need not be 1:1. To protect the gearing and prevent fouling, suitable housings for the gearings will be provided, these being omitted from the drawings for clarity. The ordimates in this diagram are values of the torque exerted upon the flap axles, and the abscissas represent flap defiection’s.

A further object of the invention is to provide a craft of this type with a plurality of sets of related vertical flaps and ailerons, so disposed that a degree of automatic levelling of the craft is obtained, e. References Cited in the file of this patent UNITED STATES PATENTS 1,302,947 Martin May 6, 1919 1,840,683 Vance Jan. Another object of the invention is to achieve an automatic depth control of the above type by very simple mechanical means which are self-operating in the sense that no special power supply is required; the energy required for operation of the mechanism is derived from the energy of the travelling vessel. 3, which is based upon a 1:1 gearing between flaps and ailerons, and upon the assumption that the pivot axes of the flaps are Well forward of their aerodynamic centers. The flaps 18 and ailerons 22 in the embodiment of Figs.

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The operation of the invention will best be understood from a consideration of the diagram in Fig. The invention therefore provides an automatic levelling feature which will be of distinct advantage in many cases. The aileron deflection (point Q) will therefore be increased, which is what is required to restore the correct submergence. 3 signifies that the aileron deflection decreases when flap deflection increases. 1 moved (or tended to move) upward or downwardly at the same time, the craft maintaining a level condition athwartships. As best seen in Fig. 2,749,871 Patented June 12, 1956 Fig. Fig. 4 is a view similar to Fig.