GB383821A - Improvements in and relating to transverse driven bodies - Google Patents

Abstract

383,821. Aerofoils, propellers, and sails. ZIEGLER, J. F., 2, Schwarzenbergplatz, Vienna. Feb. 16, 1932, No. 4630. Convention date, March 27, 1931. [Classes 4, 114, and 115.] Transverse driven bodies such as aerofoils, sails, and turbine blades, which are designed to produce a reaction inclined to the direction of motion and which have a conducting passage extending from the pressure side of the surface to the suction side are formed with means for reversing the direction of fluid flow in the passage between an inflow slot of which both edges lie within the outline of the bottom surface and an outflow slot situated in the apical or main zone of the suction surface, such means taking the form of a C-shaped passage, whereby the suction stream first travels forwardly, then is reversed backwardly and leaves in the apical or main zone. This passage may be formed between a main transverse driven body or surface and a frontal body which forms in combination with the main portion, a body having a streamline contour. As applied to an aerofoil, Fig. 1, a lower inflow slot 1 communicates with an outflow slot 2 in the main zone 4 of the upper surface adjacent to apical zone 3. Between the slots is a direction reversing passage 5 having a nozzle-like constriction 6 opening into a larger space where the passage bends round. The inner wall 9 of the conducting passage is reflexly curved and further intake slots 10 may be provided. The slot opening may also be covered with a pervious material. In a modification several outflow slots are employed between normally closed resilient hinged tongues so that the slots which are most effective at any time will open. In a modification, Fig. 7, lower slots c<1> are controllable by springs or by non-automatic means such as those shown. In a still further modification, the wing surfaces are constructed with overlapping resilient scales between the edges of which the air passes. As applied to a mainsail 11, Fig. 2, the sail is secured to a mast 12 and is provided with an air-gap or with openings 13 for the passage of air. At either side of the mast and tangential to it are auxiliary surfaces 14, 15 which overlap the mainsail and are separated therefrom by leech ropes 16, 17 or struts. The surfaces 14, 15 extend past the passages 13 and thus form intake and outlet slots according to the direction of the wind. The air flow through the gaps 13 may be made smoother by sewing in a curved piece 18 of sailcloth or by the employment of a hollowedout rotatable mast as shown in Fig. 3, which Figure also shows the sail subjected to the action of the wind.