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Aviation History
1949
1949 - 0671.PDF
April 215/, 1949 455 engine is dynaflex-mounted at nine points on the crank- case from a welded tubular ring carried, in turn, on a triangulated bracework of tubular struts running rearwards to the "longerons" of the airframe skeleton. At these points the rear fuselage is pin-jointed so that by removal of the port pins the whole rear portion of the fuselage can be swung away to starboard to allow withdrawal of the engine. Forward of the power unit, the distribution gearbox is carried at four flexible-mounting points in the bracework beneath the pylon, and the 50-gall. fuel tank is housed beneath the gearbox under a fireproof roofing. Control runs pass to starboard, and on the opposite side of the fuselage the cylindrical oil tank of 7 gall, capacity rubber/metal-bonded flexible coupling. The output side of this coupling is a short, high-tensile steel shaft, extern- ally splin$d at its forward end to the bore of the input half of a second (similar) flexible coupling. This form of drive caters for any misalignment between engine and gearbox. The driven element of the forward coupling is bore- splined to a bevel shaft meshing with a pinion to star- board whereby drive is given to the side airscrew. Whilst on the subject, it might be as well to deal with the detail elements of the airscrew drive before going on to tackle the main rotor transmission. The pinion accepting drive from the input bevel is bubtsplined to a Fairey-Metalastik flexible coupling consisting of a truncated cone rubber/ Below is 0 longitudinal vertical section through the distribution gearbox, clutch, reduction gear and rotor head, whilst at left is a plan section of the head, illustrating the trunnion pivot and blade articulation TRUNNION FLAPPING -HINGE BEARINGS DRAG HINGE SPIDER LINK is housed almost vertically at the port quarter of the pylon. In place of the normal engine reduction gear-case, a cast cover plate is fitted which extends to the root diameter of the cooling fan. In this plate are mounted 12 radial aerofoil-section Tufnol distance pieces on the crowns of which the fan tip-shrouding is supported. These "spokes" are set at an angle to act as rectifying vanes for the fan airflow delivery. The fan itself comprises 25 Aeroplastic blades, riveted in a channel-section light alloy ring, flexibly-mounted with 12 Silentbloc bushes to the fan disc-plate. The Leonides gives 520 b.h.p. at 3,000 r.p.m. at 6J lb/sq in boost. The output shaft is taper-splined to a disc coupling to which the fan plate is bolted, and from which six pins extend to the bushes of a Fairey-Silentbloc HEAD- DRMNG ' CENTRE DRAGHINGE SWASH PLATE SWASH PLATE ANCHOR STAY STEEL-CONESUPPORT MEMBER PYLON CROWN RING -STAGE EPICYCUC.REDUCTION GEAR ELECTRIC ACTUATOR Left: detail of fan and distribution gearbox, showing drive shafts, couplings, clutch, actuator and linkage, and hydraulic pump. HYDRAULIC PUMP MICRO-SWITCH CLUTCH-WSENGAGNG' SWMG-LEVER OH. PUMP SUMP
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