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Aviation History
1964
1964 - 1471.PDF
816 FLIGHT International. U May 1964 GLIDING 1964 Rudder-pedal adjusting device: adjustment (6.3in) is obtained by moving a sprung catch into the required notch Iliffe Transport Publications Ltd 1964 6LING8BY T-51 DART: STRUCTURAL NOTE8 THE SINGLE-SPAR cantilever wing of the Dart is conventional, and is constructed of spruce and birch ply. The spar unit incorpor- ates a twin section for approximately 50 per cent of the span, the main spar being completely box section. Main ribs are of spruce, with ply gussets, and intermediate ribs in the D-box are cut from gaboon ply and braced. Close rib-spacing prevents sagging of the five-ply birch skin, which runs back beyond the transition point inboard, the remaining surface being of fabric. The whole of the outer section from the inboard end of the aileron is ply-covered top and bottom. The fuselage also is conventional in construction. One interesting feature, however, is that the four longerons are placed along the top and bottom of each side of the fuselage, instead of the usual top (central), bottom (central) and sides. This enables the birch ply skin to be wrapped from one top-side longeron right round the bottom of the fuselage and back to the opposite top-side longeron; thus the fuselage remains torsionally rigid on removal from its jig and work can be carried on in the otherwise inaccessible areas. The entire front fuselage from the front-spar bulkhead is of glass- reinforced fibre laminate. In the cockpit area there are inner and outer skins stiffened by bonded aluminium tubing. The main longeron extends through this structure forward of the instrument panel. The wheel-box assembly, glued to the main bulkheads, is carried forward under the pilot's seat and is sandwiched between the inner and outer skins of the cockpit. The air gaps created by this method are subsequently filled with foam plastic cured in situ, giving a very robust cockpit floor. A one-piece moulded Perspex canopy gives an excellent view, and the adjustable fabric back-rest an unusually comfortable flying position. Port and starboard tailplanes locate on a transverse torque-tube, each being secured by a single pip-pin, the trimmer mechanism being self-locating. Construction of the tailplane and trimmer tab is conventional. Balsa is employed for ribs in the trimmer, and the tailplane ribs are of spruce girder construction with ply webs. One unusual feature is the glass-fibre laminate leading-edge, which is foam-plastic filled. The integral fin is of spruce and birch ply, with ribs of the same material. The fin-to-fuselage fairing is entirely of glass-fibre laminate, reinforced with a glass-fibre rib, the remaining fin surface being covered with birch ply. Diagonal ribs are used for the rudder, with glass-fibre gussets and trailing-edge. Diagonal ribs are secured to the rudder post and trailing edge with glass-fibre laminate gussets, and are fabric covered. Some further details are illustrated on page 818.
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