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Aviation History
1944
1944 - 1164.PDF
6oJ FLIGHT , JUNE STH- X944 • BRITAIN'S OVERSEAS AIR SERVICES tion ol a diamond cutting paste Hence, the aircraft and engine designer will be well advised to keep apertures to the absolute minimum. Vents and breathers will be necessary; at the least those which are essential should ted for easy protection when the is standing, umidity means a risk of corrosion. Components and items of equipment which are destined for tropical use must be sent out in adequate packings Ball races and similar delicate part* have been found on arrival in India to be rusty under air bubbles in the grease with which they have been covered I heard of new engines which were so badly corroded when they were received at tropical depots that every engine had to be stripped, and every cylinder lapped and honed. Indeed, engine erection and maintenance should be done in air conditioned workshops Even engines which were packed for travel in cellophane envelopes sometimes arrive at the danger-point of corrosion, as indicated by the colour,.- of the anti-moisture bags packed inside the envelope^ ^2^*8*^ ^*^ wmBEB, IQ] W *4 METAL, HEAT AND SAND : A Bristol Bombay flying over the Western Desert where an aircraft can go from intense heat to cold in a few minutes. WOOD, HEAT AND MOISTURE : Mosqu'toes are operating on the Burma front, and considerable knowledge should thus be acquired as to the effect of the climate on resin bonded plywood. WEATHER PROBLEM IN RUSSIA ; Small wooden huts on stilts protecting the engines of a German Me 323 on the north Russian front. The engines are too close to each other to enclose them all. usually because a minute tear has developed in the wrap ping during the journey. In West Africa, humidity oyer part of the year is so heavy ttaR engine covers cannot be used ffl^jrotection while standing, be- ture would get trapped in- hem, and serious condensation result. Frequently as much as f a pint of water is drawn off from drain cock of a main fuel tank r a night in the open, nevitably, high humidity causes uch trouble with radio and other electrical equipment. Leads, joints, and conduits must be protected by non-conducting flex. Approval was expressed to me of the system which fixes leads in a cement, with jury leads for replacements, thereby totally ex cluding moisture, s Serious condensa tion will occur even with magnetos and instruments in store; package in her- A metically sealed boxes is one adequate solution. The contrasting extreme of tempera ture in the British Empire is met with most strikingly in Canada. Sixty, seventy or more degrees of frost are associated with engine starting prob lems and to some extent with eccen tric behaviour of materials. Nearer the freezing point, icing-up of control surfaces and of the engine induction system become major causes of ineffi ciency and danger. '' Winterisation '' of aircraft is still the subject of detailed work in the U.S.A. and Canada. Prolonged tests on every aspect of operation, and in particular on the congelation of oils and on oil dilution in winter condi tions, have been conducted by the Royal Air Force and the Eoyal Cana dian Air Force at Kapuskasing, and by United States technicians at White Horse, Fairbanks, Alaska. Engines have been tested in many hundreds of hours of teat-bench running and conp- trolled fb/mg.
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