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March, 1934 AIRCRAFT ENGINEERING 75 Selection of Materials and Design of Component Part s for Ease of Repair PRACTICAL feature of a successful Duralumin sheet to Specification 3L.3. longerons so tha t to renew the latter has meant B ar: — attemptin g to thread the new member through aeroplane design, whether for civil or a multitude of partially dismantled joints— military duties, is the ease with which Mild steel bar to Specification 3S.1. often entailing the entire rebuilding of the its component parts may be inspected, main High tensile steel bar to Specification fuselage. Not only should the design provide tained and repaired. 2S.2. for changing any longeron with the minimum Stainless steel bar to Specification S.80. disturbance of the structure, but also the main Materials Brass bar for bearing bushes to Specifica tion 2B.6. cross members should be capable of renewal— Multiplicity of sizes an d gauges of tubes, and of especially those in way of chassis and main spar bolts and rivets, is to be avoided. Complexity Duralumin bar to Specification 3L.1, attachments . These members are the most as well as dozens of varying sizes of bolts and of materials should also be considered. Pro liable t o damage, yet it is frequently found that rivets and pins, and the usual non-metallic gress demands tha t new materials shall be made because of their important functions they materials. use of, but some designers appear to delight in are built in and secured in such an "all- the adoption of the maximum number of new Simplification is the keynote of success. embracing " manner that it is virtually im specifications so that an aircraft repair depot Aeroplane designers and draughtsmen with possible to renew them except by a long may find it necessary to stock in a variety of the complication complex should be made to laborious process possibly involving risks of the gauges and shapes such a diverse group of assemble and dissemble the components they whole structure collapsing when attempting materials as the following:— design. their removal. It should be realised that such Tubes:— renewals may have to be carried out away from A word of warning is necessary in respect of Steel tubes to Specification T.5, T.2, a well-equipped base. DTD.89A., DTD.113. the simplified design incorporating pin-jointed Duralumin tubes to Specification 3T.4. structura l members—so tempting to use, being easy to "stress," yet so frequently designed Aluminium tubes to Specification 3T.9. Sectionalised Fuselages with inadequate bearing area to withstand M.G.7 tubes to Specification DTD.186. This fact also emphasizes the need for vibration or racking loads so tha t unless made Copper Tubes to Specification 3T.7. sectional design, as the shorter portions can abnormally heavy it will often be found pre Stainless steel tubes to Specification be the more easily transported. ferable to make the members fixed—ended by DTD.105 (non-weldable). The engine mounting of a single engined two or more bolts or pins. Set screws or bolts Sheet:— aeroplane should form one section and be capable M.G.7 sheet to Specification DTD.182. are preferable to pins as they help to hold of assembly separately as a unit and be jig built Tinned steel sheet to Specification 3S.20. joints snug and so prevent wear. to ensure interchangeability. The centre sec Mild steel sheet to Specification 2S.3. tion should be the next main unit, with special Stainless steel sheet to Specification Th e Main Components consideration given to the renewal of longerons DTD.60a, DTD.166, DTD.171. and cross members aforementioned. Next, Dealing with the main components the th e main rear fuselage, reaching usually from High tensile steel sheet to Specification following points are worthy of note. cockpit to tail wheel or skid bay. DTD.100, DTD.54a and S.2. The fuselage should be designed in sections so Elektron sheet for cowlings to Specification tha t in the event of a crash only the damaged Finally, it is most essential tha t the rearmost DTD.125. section need be renewed. Too often in the past bays should form an easily renewable section, Aluminium sheet for cowlings, etc., 2L.16, have there been designs involving spool or bob as tail skid loads so frequently cause a failure 2.L.4. bin fittings or wrapper plates surrounding the a t this point. Air Ministry Contracts The following list of contracts placed by the Flare : British Anzani Engineering Co., Ltd., tio n and Oil: Asiatic Petroleum Co., Ltd., Air Ministry during January is extracted from London, E.C.—Indicators, Air Speed : R. W. Kingston-on-Thames.—Buildings and Works the February issue of The Ministry of Labour Munro, Ltd., London, N.—Lamps, Daylight Services : Cranwell—Headquarters Office Gazette : Signalling : Aldis Bros., Birmingham.— Block : Hossack & Son, Ruskington. Croydon- Lathe , Precision: Alfred Herbert, Ltd., Lympne—Steel Towers for Neons; Walker Bros., Walsall. Dhibban—Brickworks, etc.: Coventry.—Linen Fabric Planes and Strip : Accumulators , Alkaline: Batteries, Ltd., Murdock & Brooks, Cairo. Kai Tak—Pressed Ulster Weaving Co., Ltd., Belfast; Stevenson Kedditch.—Aircraft: Airspeed, Ltd., Ports mouth Air Port ; De Havilland Aircraft Co., Steel Tank, and Tower: South Wales Steel & & Son, Ltd., Dungannon.—Magneto Spares: Ltd., Edgware; Fairey Aviation Co., Ltd., Iron Co., Ltd., Stockton-on-Tees. Kenley— Rotax , Ltd., London, N.W.—Maintenance of Ai r Route Lights: Gas Accumulator Co., Hayes.—Aircraft Conversion: Blackburn Underground Cables: Malcolm & Allen Brentford.—Marine Engine Spares: Norris, Aeroplane & Motor Co., Ltd., Brough.—Air (London), Ltd., London, W.C. Old Sarum— Hent y & Gardner, Ltd., Patricroft.—Mech craft Conversion Sets: Hawker Aircraft, Officers' Mess and Quarters: J. Laing & Son, anical Transport Spares: Crossley Motors, Ltd., Kingston-on-Thames.—Aircraft Flight Ltd., London, N.W. Pembroke Dock—W.O.'s and Airmen's Married Quarters: S. G. Thomas Ltd., Gorton.—Modification of Windmill Test : Sir W. G. Armstrong Whitworth Air & Son, Pembroke.—Canvas Duck, White: Bosses : Hobbies, Ltd., Dereham. — Oil, craft, Ltd., Coventry.—Aircraft Spares: Sir W. G. Armstrong Whitworth Aircraft, Ltd., Jame s Stott, Ltd., Oldham.—Engines, Aero. : Lubricating : Anglo-American Oil Co., Coventry; Blackburn Aeroplane & Motor Co., Rolls Royce, Ltd., London, W.—Engines, Ltd. , London, W.C.; Sternol, Ltd., Lon Ltd., Brough; Fairey Aviation Co., Ltd., Aero. , Rebuilding and Testing : Armstrong don, E.C.—Polish, Metal: Pavitt & Co., Ltd., London, S.E.—Radiators and Cases: Hayes; Hawker Aircraft, Ltd., Kingston-on- Siddeley Motors, Ltd., Coventry; Bristol Aero Serek Radiators Ltd., Birmingham.—Sound Thames; A. V. Roe & Co., Ltd., Manchester; plane Co., Ltd., Bristol.—Engines, Aero., Fil m Projectors: British Thomson-Houston Westland Aircraft Works, Yeovil.—Airscrews: Spares : D. Napier & Son, Ltd., London, W. Co., Ltd., London, W.C.—Titanium Tetra Airscrew Co., Ltd., Weybridge; Bath Aircraft, — Fertilizer : Fison, Packard & Prentice , Ltd., Ipswich.—Film, Talkie, Supply of: Pathé chloride : Peter Spence & Sons, Ltd., Man Ltd., Bath.—Airscrews and Spinners: Pictures, Ltd., London, W. ; British Thomson- chester.— Tyres : India Tyre & Rubber Co., Fairey Aviation Co., Ltd., Hayes.—Armoured Car : Armstrong Siddeley Motors, Ltd., Coven Houston Co., Ltd., Ltd., London, W.C.—Fire Ltd. , Inchinnan.—Wheels, Aero.: Dunlop try.—Belts, Safety: Mills Equipment Co., Extinguishe r Froth Spreaders: General Rubbe r Co., Ltd., Birmingham.—Windmills, Metal : Airscrew Co., Ltd., Weybridge. Ltd., London, S.W.—Brackets, Wing Tip Fire Appliance Co., London, E.C.—Fuel Avia
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Mar 1, 1934
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