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Aviation History
1955
1955 - 1848.PDF
30 December 1955 971 Dural lugs at each end of the base tube, the rear fitting acting also as the fuselage anchorage for the fork-ended wing-strut. The power unit is a Lycoming GO-480-B1B horizontally opposed six-cylinder wet-sump engine of 270 h.p., driving a Hartzell HC-82X20-1B constant-speed airscrew of 7ft 6in dia- meter. The method of engine mounting is conventional, the engine itself being carried on four rubber-in-shear Lord blocks, and the engine bearers carrying the air-intake nose-ring and the oil radiator at their forward extremities. The four engine-cowling panels do not hinge, but are fitted with quick-release fasteners. Aft of the engine is a stainless-steel firewall, the lower section of which forms the foremost bulkhead of the freight cabin. A 24-voh battery is located aft of the firewall, beneath the pilot's cockpit, on the port side. The undercarriage, of Percival design, employs rubbsr-in-com- pression main struts and has a track of 10ft 5in. The lower vee struts are of T.45 steel tube. Goodyear wheels and hydraulic disc brakes are fitted. The undercarriage has been designed for a vertical velocity of 9ft/sec and, because of its long travel, is claimed to have better energy-absorption characteristics than many deck-landing undercarriages designed to lift/sec. The cockpit is designed to accommodate two pilots, with dual control, although for agricultural work only the left-hand seat will be occupied. The front windscreen is a one-piece single- curvature moulding of 3/16in Perspex, which material is also used for the upper half of the pilots' doors and the transparent panels above them. The roof of the cockpit is a double-curvature skin panel of L.16 aluminium. The pilots' seats are stressed to withstand 25g. Front and rear mounting brackets are attached to the cockpit floor and the cross- strut of the main frame respectively. Between the seats a built-up L.72 beam runs forward from the main-frame cross-strut, its purpose being to carry the pilots' vertical-acceleration loads, and acceleration and deceleration loads of the engine. It also assists in keeping the freight space clear, and provides a bearing for the rudder-pedal shaft and a mounting for the flap-operating mechan- ism. The instrument panel is mounted by brackets on a diagonal central beam running up to the top of the firewall; the central throttle and mixture control are carried on a short beam member which is also mounted on this diagonal strut. Elevator trimming SLOTTED (DROOPING) AILERONS SUOTTED FLAPS ALL-METAL TAIL SURFACES (STRUT BRACED METAL FUEL-TANK IN EACH WING-ROOT. TOTAL 56 Imp ool WELDED STEEL TUBE FUSELAGE FABRIC-COVERED REAR FUSELAGE PORT AND STARBOARD TAILPLANES INTERCHANGEABLE RUBBER-SPRUNG LONG-STROKE TAILWHEEL UNIT METAL-SKINNED CLAMSHELL DOORS ».(«ir((< •ASSENGER/FREIGHT )OOR (WOOD. ABRIC COVERED) 5ER-IN- PRESSION CK-STRUT K tIO' S") [RCARRIAGE METAL PANELS BELOW WINDOW LINE 1 Air to oil-cooler. 2 Oil filler (wet-sump engine). 3 Central throttle, mixture and Ki-gass. 4 1 -5 kW, 24-volt generator. 5 24-volt battery. t Elevator trimmer in roof. KEY TO DRAWING 7 Flap lever. 8 Toe brakes. • Dual control (optional). 10 Central beam taking engine and floor loads. 11 Light wooden stringers. 12 Mass balance. and13 Tubular leading-edge trailing-edge members. 14 Rubber-pressed ribs. 15 Aileron-droop linkage detail sketch). 16 Flap/aileron connecting cable. 17 Elevator and rudder cables. (see ONS A tubular-steel fuselage framework and metal-skinned wings and tail are features, of the Edgar Percival P 9, as shown in this "Flight" cutaway drawing, by Arthur Bowbeer, of the prototype machine. Simplicity and rugged design, as befits a farm vehicle, are apparent. PRODUCTION TAIL WHEEL UNIT
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