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Aviation History
1924
1924 - 0606.PDF
SEPTEMBER 25, 1924 Tie-rod drag bracing is employed, and it is of interest to note that the lift struts are attached not direct to the spar flanges, as is usually done, but to the tubular drag struts. The arrange ment is shown in sketches 5 and 6. This form of attachment avoids all twisting stresses on the spars, and as the strut fittings are placed close to the spar walls the tubular drag struts are not subjected to bending loads but merely to shear. The pin joints of the wing roots to the fuselage are not placed on the neutral axis, but on the lower flange, as shown in Figs. 1 and 2, and the front hinge is a universal joint about which the wing can swing when the rear spar pin and the strut from which a'short tube runs to the aileron crank on top of the wing. By suitable setting of this crank a differential movement is imparted to the ailerons—i.e. the rising one moves through a greater angle than the dropping one. The fuse'age is of similar construction to last year's single- seater " Pixie," and consists of four longerons braced by triangulating struts attached by three-ply gussets. This Side elevation of the Parnall two-seater light monoplane. attachments are cast adrift. The wing can then be tilted with its trailing edge upwards, and can be folded back along the sides of the fuselage. The machine is shown with wings thus folded in one of our photographs. Fig. 4 shows parts of the differential aileron control. The cables pass from the cockpit along the wing to a double- crank lever mounted on a vertical tubular pillar. At its upper end this pillar carries another small (single) crank, form of construction gives a very light structure, and requires no trueing-up once it has left the stocks. A side elevation of the fuselage is given, from which, in conjunction with what has already been said, the construction of the fuselage should be fairly clear. At the stern the fuselage terminates in a vertical knife-edge formed by a channel-section metal strip. The short elevator control tube passes through an opening in this strip from the arms of the short layshaft inside the SOME CONSTRUCTIONAL DETAILS OF THE PARNALL TWO-SEATER LIGHT MONOPLANE : 1. A wing root, showing trunnion for attachment to fuselage. 2. The wing in place, showing attachment. 3. Lay shaft and cranks of the elevator. The tail plane tube has been omitted for the sake of clearness, as has also the tail skid, which is made from cane. 4. Details of the differential aileron control. The two cables run to the controls in the cockpit. 5. Shows the spar construction. 6. The lift tubes are attached not direct to the spar, but to the tubular compression strut of the drag bracing, so that the angularity of the lift strut does not produce twist in the spar. C06
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