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Aviation History
1945
1945 - 1861.PDF
FLIGHT SEPTEMBER 2OTH, 1945 ROLLS-ROYCE GRIFFON (65) with a change-speed switch to by-pass the aneroid and thus permit a change in blower speed for emergency use, to allow of retaining low gear for formation flying, or to allow of ground testing. In order that no ill effects result from small axial movement as between the driving gears of the speed- change unit and also to preclude the effects of an over- hung drive, the respective drive pinions on the impeller shaft are not integral. In point of fact, only the M.S. pinion is mounted on the impeller shaft itself, the F.S. pinion being supported in a housing around the spring- drive sleeve, with a bell coupling separating the pinions and splined to each. Induction is updraught through a triple-barrel- throttle in the mouths of which are the Venturis for fuel metering balance. The carburettor is a Rolls-Royce modification of the Bendix-Stromberg metering injector, and supplies a governed measure of fuel to a series of discharge nozzles arranged in a "hub" from which project eight "spokes." On the downstream side of these is created a depression or turbulent area into which the fuel nozzles discharge, and from here the mixture is taken straight into the eye of the first-stage impeller. Rectifying and diffuser vanes are interposed between the first and second impellers, and in this inter-stage area the blower casing is cooled by its own little coolant system. From the second-stage impeller the charge is passed through a further diffuser ring and Sir Arthur TedderV Deputy Supreme Commander THE London Gazette of Septembernth announced the promotion of Air Chief Marshal Sir ArthurTedder, G.C.B., to Marshal of the Royal Air Force. The public remembers Sir Arthurchiefly as having been A.O.C.-iu-C. the Mediterranean Air Command from1943 until he was appointed Deputy Supreme Commander of the AlliedArmies of Liberation under General Eisenhower. But his earlier careerhad been full of promise. He entered the Army in 1913 with a Universitycommission from Cambridge, where he was at Magdalene College. As anundergraduate he gained a University so to the volute delivering to the intercooler. An accelera- tor pump is located in the up-draught throat between the nozzle spider and the impeller eye, and discharges through a single nozzle. The inter-s'tage impeller case cooling has the effect of increasing the charge density as an irTtermediate measure, and by so doing increases the capacity efficiency of the second stage. This principle lies behind the use of the main intercooler, for an increase in charge density for a given volume enhances the volumetric efficiency, and although this leads to a large flow through the carburettor and, thus, a higher consumption, relative to the power increase, the step-up in consumption is well worth while. For the future, Rolls-Royce have evolved a metering pump to supplant the present system, and it also seems likely that water / methanol injection will be introduced before very long, not necessarily only as an emergency measure but as a normal running condition. Direct in- jection to individual cylinders will also, without doubt, eventually be incorporated. There is this to be said for the new metering pump : it is an extraordinarily simple unit of great reliability and meters so accurately throughout the whole performance range that it is not too much of an exaggeration to state ,,that flights could be planned to within a half-gallon of fr^ll endurance. With this is natur- ally Jjj3lwfr"1T*TOn*«4«nd pre-knowledge of specific con- ption such as hjpsn^yer before been known. 'omotioii of the Royal Air ForceM&rsl JOL Marshal of trie R.A.F.Sir Arthur Tedder, G.C.B. ^ A on the^Navy of the Restoration, which wasiewed in/^he Times. His first commission was Regiment, and with it he went to France in__ us he be,l<5ngs to the honourable company of " Old :mptibles.",.~'ln 1916 he was seconded to the Royal FlyingCorp?, and during the war was mentioned several times in despatches. >4ut the battle of Arras in 1917 he commanded No.70 Squadron, which was equipped with 18 Sopwith two-seaters. •—. Since the 1918 Armistice Tedder saw service during theChanak crisis in 1922. In 1928 he attended a course at the Imperial Defence College—a very good preliminary for hissubsequent post as Deputy Supreme Comma^fler of British and American forces of all Services. In 1936 he was appointedA.O.C. Far East Command, with headquarters at Singapore. He has also held various important posts at the Air Ministry,including that of Director-General of Research and Develop- ment and'Director of Training. LINCOLN'S CIVIL SISTER : A new photograph of the Avro Tudor I doing a little overweather flying. The wing arrange- ment of the Lincoln and the Tudor I is identical.
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