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Aviation History
1951
1951 - 0844.PDF
FLIGHT, 4 May 1951 529 P11 MAGNETIC COMPASS INSTRUMENT PANELS COOL AIR \ MAGNETO SWITCHES CANOPY N,OPERATING k. HANDLE RUDDER PEDAL ADJUSTMENT RELEASE / T.B.A AND V.H.F MUTING BUTTONS BRAKES STARTER AND BOOSTERCOIL BLMORSE/STEADY, SWITCH AND \MORSE BUTTON CONTROL SEAT LOCK ADJU RUDDER ELEVATORIUSTMENT FLAPS TRIM TRIM PRIMER 1. Air-speed indicator 2. Altimeter 3. Artificial horizon A. Directional gyro 5. Kate of climb 6. Turn and slip 7. Tachometer 8. Boost 9. Oil temperature 10. Oil pressure 11. Clock 12. Fuel gauge OIL COOLER SHUTTERCONTROL AND INDICATOR 13. Cylinder-head temperature 14. V.H.F. control 15. Pitot head heat 16. Air-bottle pressure :„ 17. Power-failure warning18. Vacuum gauge Having regard to the designed purpose of the aircraft, the cockpit layout leaves nothing to be desired, and this, together with the excellent field of view afforded each pilot, and the generous width at shoulder level, makes it difficult to see where any improvements could be made in the scheme. PERCIVAL P. 56 whereas the lower longerons die out into Z-stringers over a distance of approximately 30m, the transition being complete at about the fin front-attachment station. One frame bay abaft the structural break, at lower longeron level, is a radio and battery support floor which extends 57iin aft. Top- hinged access doors are fitted in each side of the fuselage, that on the port side giving access to the radio equipment, and that on the starboard side giving access to the batteries; both doors are 18.35m long, and about 13m high. The front attachment of the fin is made through a plate fitting, bolted to the deepened crown of a normal fuselage frame; but, at the rear of the fin, attachment is made at two machined lug forgings, bolted to the head of a diaphragm bulkhead spanning the whole cross-sectional area. This bulkhead serves as a supporting medium for the control transmission linkages to the tail surfaces. Immediately abaft this bulkhead, the fuselage topsides are cut-away for accom- modation of the tailplane, and are bridged by a light-alloy sheet decking. Embodied in this tail decking is the support- ing structure for the foot of the rudder post, immediately rearward of which a pair of machined, forged fork fittings for tailplane front attachment project up through the decking from a box frame by means of which some of the tailplane loads are distributed. The tailplane rear attachment is made through machined, forged lug fittings, bolted to the head of a diaphragm which is, in fact, the tail end-wall of the rear 1' fuselage proper. On the rear face of this bulkhead is carried the tailwheel assembly, mounted in a light alloy casting, bolted to the diaphragm bounding frame. The tail extremity of the fuselage is wedge shaped, and takes the form of a light, removable fairing. Before leaving the fuselage to examine the wings and tail surfaces, some attention must be accorded to the cockpit. This is of frankly generous size, the width being no less than 45m. The accompanying detail drawing gives an excellent illustration of the instrumentation and the disposition of controls, .but mention must be made of one or two other points. The rudder pedals, which are assemblies of Percival design, move with a parallel-action, and are spring-loaded for adjustment; the pilot pulls a knob, pushes the pedals to suit his leg length, and, on his releasing the knob, the pedals are automatically set for his comfort. Another ingenious feature is the seat mounting. Standard S.B.A.C. bucket seats are used, but each is mounted on a cradle from the four corners of which lugs extend down and are pin-jointed to quadrants. The front quadrants have their arcs drilled for engagement by spring-loaded pins, whilst the rear quadrants are spanned by a torque tube from which depends a horn arm attached to one end of a length of elastic cord, the opposite end of which is anchored; front and rear quadrants are linked by fore-and- aft tubes. Outboard of each seat is a fixed hand-grip, in which is incorporated a slide-grip whereby, by a Bowden cable, the spring-loaded pins can be released from engage- ment with the quadrants. Tension in the elastic acts against the (continued on p. 532, after cut-away drawing of the P. 56)
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