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Aviation History
1918
1918 - 0742.PDF
7 ft. 8 ins. to 7 ft, 5 ins., and the wing section is shown shaded in Fig. 11. In order to provide a basis of comparison the R.A.F. 14 wing section is superimposed and drawn to the same scale. The main spars are placed one metre apart, the front spar FIG. I 1 t EH1 i JULY 4, 1918. Internal cross bracing between the main spars is affordedby steel tube cross members and cables attached as shown in the sketch Fig. 10. The main spar joint consists of a steel plate 19 mm. thickembedded in the spar end and held in position by 5 bolts, which pass through a strapping plate surrounding the end..of the spar. This plate also carries the attachment for the bracing cable, and is furn;shed with a spigot which locates the bracing tube. It w 11 be seen that at this point the spar is provided with tapered packing pieces of hard wood glued and held in position by fabric wrapping.The main ribs are placed 360 mm. apart. Between them are auxiliary formers, consisting of strips of wood 20 mm.x 10 mm. thick, which run from the leading edge to the rear spar. The main ribs consist of ply wood webs socketted into.grooved spruce flanges, which are tapered off as shown in - Fig. • , except where they are met by a longitudinal stringer. The leading edge is solid wood moulded to a semi-circular section of approximately 65 mm. diameter. Where the rib * web. abuts against it, packing pieces are glued each side.Between the main spars the web of the rib is divided by three vertical strips into four panels, and in each of these it is perforated, leaving an edge all round about 72 mm. wide.As shown in Fig. 10, the.upper flange of the main ribs is carried clear of the leading spar by means of packing pieces.In the case of the rear spar, packing pieces are also used under the rib flange, as shown in Fig. 14. The lower main planes for a width of about 2 ft. 3 ins.at their inner end are covered as to their top surface with three-ply wood. The interplarre struts are attached to the main spars byjoints of the type shown in Fig 15. This, it will be seen, being 272 mm. in the rear of the leading edge. Both sparsare of the built-up box type, as shown in Figs. 12 and 13. The former is the leading spar and the latter the rear spar.These spars are of spruce, and each half is furnished with Fig. 20—View looking down inside of fuselage from the main nacelle, showing trap-door and after-gunner'sfolding seat. several splices, so that the greatest single length of timber in them is not more than 14 ft. The splices, which occur in each half alternately, are of the plain bevel type about 15-ins. long and wrapped with fabric. A fabric wrapping is also applied at short intervals along the spar. FiV 21 follows the typical German practice of partially universal jointed mountings for the cable attachments. At the points of attachment of these strut joints, suitably tapered packing pieces of hard wood surround the spars, which at these points arc also wrapped with fabric. Struts. .'•'"' ' , .; . Outside of the centre section the interplane struts are of wood built up, as shown in the section Fig. 16, of five separate pieces. The curved portions are of timber which has not yet been identified, but is apparently of poor quality. The cross web is of ash. The strut is wrapped at frequent intervals with strips of fabric and is fitted with a socket joint of the type shown in Fig. 17. The outer pair of struts are of smaller section than the main struts, but are built up in a similar | manner. Their section is 125 mm. x 40 mm. ' .. . ;.. Ailerons. The framework is principally of welded steel tube wrapped with fabric. ' , A notable point is the thick section of the leading edge of the balanced portion, as shown in Fig. 18. Fin and Fixed Tail-planes. '• ~ >~" v The framework of these is steel tube, and in the case of the tail-planes wooden stringers running fore and aft are arranged at intervals. The tail-planes are supported by diagonal steel tubes of streamline section, on the under side of which sharp steel points are welded to prevent these stays being used for lifting purposes. Elevators and Rudders. The framework in each case is of steel tube, the main tube being 35 mm. in diameter and the remainder 15 mm. Bracing. Throughout the wings, both internally and externally, the bracing is by means of multistrand steel cable. 740
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