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Aviation History
1957
1957 - 0441.PDF
k Fig. 11 (left, above). The port mainplane assembly and skinning jig from the wing-tip end. The profile board holding the outermost rib and the hinged supports for the rear spar-tube are clearly visible. Fig. 12 (right, above). Inboard end of the starboard mainplane, show- ing the spar root-end location and the tank-bay rib structure, which is pre-assembled as a structure with its rear false spar. Fig. 13 (right). Detail work on the framework of a port mainplane. A indicates a main-spar support and B the hinged rear-spar supports. photograph that, although the main rib webs are of thin material—20 or 22 s.w.g.—the spar attachment fittings are neat, rigid little forgings, pre-drilled for both rib-web and spar-web rivetholes. The rib blanks and their stiffeners are drilled together from the bushed drill-plate of the jig, but the fittings are usedas masters to drill both the web and the stiffening doubler. The wing spar consists of a plate web with extruded-angleflanges, doubled to form a T where the strut loads are diffused. The web is assembled—in sections with butt-strap joints—on atable-type fixture with the extruded flanges and end fittings. Bushed Hydulignum drill boards are used. The parts are held inposition by toggle clamps similar to those on the welding jigs (Fig. 9). After removal from the jig the parts have their holesde-burred and interfaces treated with anti-corrosive compound before they are brought together by rivet clamps. All rivets areinserted and their heads secured with Sellotape; and the com- ponents are then riveted in a Broom and Wade pneumatic squeezeriveter. The skin-attachment holes are drilled in the flanges with the aid of a metal drill-plate cramped to the spar. The leading- and trailing-edge spars are simply plain lengthsof tube, which are jig-drilled (Fig. 10) for the rib-attachment rivets. With the spar tubes and the ribs pre-drilled, individualrib supports in the jig are eliminated. The root end of the rear spar-tube receives the spigot of the fuselage-attachment lug. The assembly of the wing is a simple business—greatly facili-tated naturally, by the similarity of the ribs in the parallel chord. The main spar and the rear spar-tube are located precisely atthe root ends by dummy fuselage attachment fittings and at the tips by tooling holes in the wing-tip attachment rib and a profileboard (Figs. 11 and 12). The main spar (Fig. 13) is supported against bowing at intervals by pads on removable brackets (A),while the rear spar-tube is similarly braced by simple hinged brackets (B). It is then a case of offering up the ribs and locating (Concluded on page 446) Fig. 14 (right). Finishing fixtures tor the mainplanes. The skin is here closed with the pre-assembled flap and aileron shroud units. The tank is also put in and the wing root sealed. Fig. 15. Although there are always new E.P.9s on the finishing line it is not a photogenic stage, because quarters are rather cramped. Seen here is the Mana- watu Aerial Topdressing com- pany's pre-production ZK-BDP. Fig. 76 (extreme right). Export aircraft entail packing. The Manawatu F.P.9 as crated by Blake's Wharves, Ltd., for the sea journey to New Zealand.
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