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Aviation History
1957
1957 - 1006.PDF
1002 ENGINE INTAKE CONTROLS . . . amplifier, with components mounted on a printed card, weighsapproximately 3\ oz. It is a transistor amplifier discriminator consisting of a two-stage voltage and current amplifier, and astage phase discriminator. The unit requires a single external power source of 115 volts at 400 c/s. A three-terminal outputgives phase-sensitive, full-wave direct current. The gain ratio in .amperes per volt is adjustable over a minimum gain range from0.02 to 0.20 amperes per volt. The amplifier also contains pro- vision for an A.C. output if required. Many parameters are of importance in designing such a system,and extend well beyond those discussed here. Any air breathing engine, turbojet or ramjet, flying at Mach numbers high enoughto experience an attached oblique shock at the wedge or cone tip, must have the diffuser profile so designed as to obtain maximumpressure recovery by correct location of the oblique and normal shock waves. Diffuser throat area and exit nozzle area are critical, as anythrottling or back pressure will expel the normal shock wave upstream. There is a "buzz" effect experienced near criticaloperation of a diffuser, due to the non-stationary flow phenomena. This undesirable effect can cause serious structural deformation, FLIGHT, 27 December 1957 Each of the J79 engines of the Convair B-58 Hustler has an intake centre - body which is positioned by an electric ball-screw actuator shown here. The assembly weighs W/i Ib, has a stroke of 13.4in and can drive the centre- body against a 3,600 Ib load. %-. owing to the high-frequency and pressure amplitudes in theengine duct. " The experimental and analytical investigations of the problemsreviewed above challenge the ingenuity of both the research scientist and aeronautical engineer. The results of their work haveadded considerably to the resources of the aircraft designer. ' ON BALANCE (continued from page 980) announced trading profit for the year ended September 30,1956, at the new high level of £195,400 against a shade under £180,000. Shareholders were told that the volume of orders onhand were such as to ensure a satisfactory level of production for a considerable period ahead, and that it was believed that theproducts manufactured by their companies were of a nature least likely to be affected by any cuts in conventional armaments.The Plessey Company's consolidated profit for the year ending June 30, 1957, was returned as £1,486,700 against £1,525,100. Elliott Brothers (London) issued their 1956 trading profitsat the new high record of £788,800 against £405,000 and described their guided weapons and aviation departments as hav-ing enjoyed a very active year. It was also stated that they had recently built a special testing station adjacent to their RochesterWorks to permit the testing of aircraft flowmeters which they manufactured under licence from the well known American com-pany, Bendix Aviation Corporation. H. M. Hobson's trading profits for the year ended September1956 were also a new high level, i.e., £952,200 against £607,500. It was stated that the changing pattern of defence requirementscontinued to receive the closest attention of the directors. The Airscrew Company and Jicwood celebrated their twenty-first anniversary as a public company by announcing trading profits at the highest for the past six years, i.e., £156,000 toMarch 1957. This compared with £106,200 for 1956 and £71,200 for 1955. Flight Refuelling (Holdings) announced trading profits at anew high level for 1956, i.e., £476,000 odd against £345,500 at the same time as the advice that it proposed to increase its capital.Simultaneous news was that the recession of work on military contracts was envisaged as materially affecting profits for thecoming year. Every effort, however, was being made to obtain new contracts from countries overseas and further to diversify thecompany's products. The R.F.D. Company's trading profits for 1956 at £156,400compared with a shade under £177,000 for 1955, the latter being a new record. Increased competition was envisaged, but theyanticipated being able to maintain and also improve their lead against all competitors. Tube Investments' trading profit for the year ended July 31,1957, was returned at a record figure of £15,650,000, com- pared with £14,615,000. The latter figure, however, was reachedafter including some £900,000 of exceptional profits arising from increase in price of raw materials. The results of the companieswhich last year comprised their Aluminium Division were better than they expected in a period of rising costs and world surplusof aluminium. British Aluminium's trading profits for 1956 were also a newhigh record, i.e., £4,485,000 compared with £4,340,000. It was at the same time stated that the Board had been actively studyingways and means of taking an interest in the development of further sources of the supply of alumina. REMOTE SELECTION A NEW lightweight remote-controlled selector unit which iscurrently in use on V.H.F. transmitter units has been developed by the Plessey Co., Ltd., of Ilford, in collaborationwith the R.A.E. Known as the type 9008, it has been designed to select any one of twelve predetermined angular positions of arotating shaft, within one 320-deg turn. Primary movement of the unit is provided by an electric motoroperated from a 48 V D.C. supply which may vary between + 6 V. A relay is used to control the operation of the motor and to reverseits rotation. Selection of the required position is by means of a single-pole twelve-position switch at the remote operating position. Each angular position can be set individually without affectingthe other settings and facilities are provided at the rear of the unit for limiting the arc in which the twelve positions are contained.Accurate settings can be obtained by fine adjustments to the output or tuning shaft with a geared-down control knob.The unit is capable of driving an external frictional load of 2J lb in and resets within nine minutes of arc on any single position.The average reset error obtained from all twelve positions is better than six minutes of arc. The output shaft at the rear of the unitextends through the front panel to carry a dial co-operating with a pointer. Another dial indicates which of the twelve positions isin use. Overall dimensions of the unit, which has been designed formounting in equipment protected against the free entry of dust, are approximately 4in by 4in panel space, by 4Jin depth. Weightis about 2i lb. EFFICIENT WORKS LIGHTING AN interesting lighting installation has recently been broughtk into use at the de Hayilland Propeller Company's new factory at Stevenage, Herts. A high bay arrangement installed by Hollo-phone, Ltd., it may be the first in the United Kingdom to use the latest development in l,000W MBF/U lamps. The fittings are mounted at a height of 28ft 6in and spaced24ft 6in apart, the working area being lighted measuring 210ft x 150ft.As the work envisaged for the extension was to be of an exacting nature an efficient light distribution with an overall intensity of25-28 lumens/sq ft was planned. A reading taken on the working plane prior to installation of machinery gave a reading of35 lumens/sq ft. A sufficient degree of ceiling brightness is achieved to avoid a tunnel effect. The Hollophone prismatic high bay fitting No. F.3056 is used-Average output of the lamp, which runs on a mains voltage of 230 V, is about 45,000 lumens and rated life is approximated5,000 hr. VOKES RESULTS AT the annual general meeting of Vokes, Ltd., held or- December 17, it was stated that the net profit of the group foi the year ended June 30 was £165,302, while that of the parencompany was £143,804. These figures compare respectively with £157,175 and £135,402 for 1955-56. The group's products o.'particular interest to the aviation industry include filters (air, oil fuel and special-purpose) and silencers.
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