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Aviation History
1948
1948 - 1624.PDF
September 30th, 1948 404 CAPTAIN 1ST OFFICER FLUORESCENT CABIN LIGHTING CARBURETTOR INTAKE CREW FREIGHT ENTRY DOOR COMPARTMENT D.H. HYDROMATIC AIRSCREWS HERMES IV while to devote some attention to the fuselage pressuriz- ing factors. Dry air sandwiches with silica-gel desiccant packs are used for the cabin windows and the pilot's wind- screen, and the peripheral seals to the entry doors are of R.A.E. pattern. This employs a rubber membrane enclos- ing a space open to cabin pressure and closing against an edge of the* door rebate, so that pressure differential will cause the membrane to swell and so provide an effective seal. The nosewheel retraction well is not pressurized, and, to " ease the strain," the sidewalk are curved so that a cross- section through the well has something of the appearance of a top-hat. Perhaps the most unusual aspects of fuse- lage structure in the pressurizing context are (i) the em- ployment of a fiat rear pressure bulkhead instead of the far more usual dome, and (ii) the complete absence of a front pressure bulkhead. The latter function is undertaken by the radome. This is an Onazote-Fibreglass-Nuron View looking from galley into forward cabin. 1ST OFFICER CAPTAIN^//ENGINEER J CREW NAVIGATOR/ CRE\*T LOCKE* ^ DOOR FREIGHT DIPLOMATIC MAIL (UNDER) CROCtW(OVER) sandwich nosecap which encloses the cloud and collision warning radar equipment in the extreme nose of the fuse- lage. Certainly, the cross-section is circular, and thus stress distribution is equable, but, nevertheless, it does strike one as unusual that a plastic material, the chief characteristic of which is a low di-electric constant, should be up to the job of coping with a pressure differential of 5J lb on every sq in of its internal surface. Wing structure comprises centre-section, intermediate wings and outer wing panels, but, although the centre- section and fuselage are built separately in the initial in- Curves of climb performance « 82,000 Ib. (solid lint) and of /eve/ speed performance at 78,000 Ib. (broken line). TRUE AIRSPEED -M.P.H. 2SOOO 24O 26O 2 BO JitO 36O / • RATE OFCLIMB 4 ENGINES IOOO RATE OF CUMB-FT/MIN SO TIME TO 1«IGMT-MIN
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