GB269848A - Improvements in the construction of flexible aeroplane wings with variable profile - Google Patents

Abstract

269,848. Antoni, U. Dec. 29, 1926. Planes, construction of; steering, balancing, and regulating altitude. - Planes with variable camber are formed with movable front and rear sections 1, 20, the part AB of the rear section adjacent the fuselage being automatically flexdble, and the front section and the remainder of the rear section being movable under the control of the pilot. The wing framework comprises a pair of spars 4, 19 connected at intervals by ribs 35. Front shaping ribs 1, formed with arms 5, Fig. 3, are fastened to the leading edge member 2 and are pivoted at 10 to the bottom of the spar 4, which passes through holes 3 sufficiently large to permit rocking movement of the ribs 1, the upper parts of which are held between pairs of guides 12 mounted on the spar. The arms 5 are connected by links 13 to arms 14 fixed to a spindle 15 journaled on the members 35 and rotatable by a lever 36. That part of the rear section which is movable by the pilot consists of shaping ribs 20 similarly pivoted on the rear spar 19, their arms 16 also being connected by links 17 to the arms 14 to permit the pilot to depress the front and rear sections simultaneously. Upper and lower boom strips 8, 9 are fixed in recesses 6, 7 in the shaping ribs 1, whilst the rear ends are slidable in recesses 25, 26 in the ribs 20. At the centre these strips are spaced apart by sleeves 34 fixed to the arms 5. The wing profile at the upper junction of the rear section is maintained by a covering strip 27 secured to the upper booms 8. The surface covering of the front part of the wing is secured above the strip 27, whilst that of the rear part is secured below the strip 27. The automatically flexible rear section AB of the wing is provided with arms 20<1>, Fig. 2, connected by pivots 28 to the top of the spar 19, and carrying sleeves 34 in which slide the boom strips 8, 9 which are held together towards the trailing edge by pairs of triangular frames 31, 32, the abutting sides of which are connected by elastic members 33 tending to hold the rear section in its normal position but permitting upward flexure. The boom strips 8, 9 pass to the front section through guides 29, 30 on the spar 19. The flexibility of the portion AB is increased towards the fuselage to assist automatic balancing.