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Aviation History
1960
1960 - 0768.PDF
776 FLIGHT, 3 June 1960 THE INDUSTRY Silencing at Prestwick A NEW ground-running silencer for Canadian CF-lOOs,designed by Industrial Acoustics Co Ltd and called the Durastack, has been fabricated by Burnley Aircraft Products Ltdand installed at Scottish Aviation's factory at Prestwick, where Canadian aircraft are overhauled. ? The silencer, illustrated here, has two direct couplings andaugmenter ducts leading to a single welded-steel working chamber. Soft asbestos-covered adapter nozzles fit right over the enginetail-pipes so that no noise escapes at this point. Immediately aft of the couplings are specially shaped intakes through which cool-ing air is drawn into the main hot gas-flow, reducing efflux tem- perature from 1,200 °F to about 600 °F. The main chambercontains an arrangement of baffles which are fabricated of heavy- duty steel plate to permit higher working temperatures and moreeffective silencing. The exhaust is vented vertically upwards through a rectangular duct whose height can be increased, ifrequired, to lead gases farther away from an installation or to provide still further silencing. An adapter has also been providedto allow Canadair Sabres to use the Durastack. The silencer was made under the patents of the parent Americancompany, Industrial Acoustics Co Inc, who have supplied many silencers in the US and Canada. The English company hasalready received orders from Norway and elsewhere and has also produced a very successful portable silencer for the Scimitar(Flight, April 15). During preliminary tests made at Prestwick the Durastack effected a noise .reduction of over 25db and normalconversation was possible in the zone of greatest noise within 300ft of a CF-100 running at full power. The installation illus-trated is stated to cost about £11,000. Chloride's New Laboratories THE new central research and development laboratories of theChloride Group at Clifton, Swinton, Manchester, were offi- cially opened on May 20 by A. W. Browne, chairman of theChloride Electrical Storage Co Ltd. The two principal buildings of the facility, which has a total floor area of over 41,500 sq ft,house chemical, electro-chemical and metallurgical laboratories and workshops, and a library and conference room. The staff of180 includes 40 qualified specialists. Among work already in progress is the development of batteriesfor guided-missile applications and for powering meteorological- balloon recording and transmitting equipment; research is alsobeing done on water-activated batteries for air/sea rescue equipment and comparable applications. "Flight" photograph This view of the Durastack ground-running silencer shows the couplings for the tailpipes of a CF-100. A photograph of the installation with an aircraft coupled to it appeared on page 707 of last week's issue Low-temperature Versatility USE of sub-zero-temperature equipment for various test, con-ditioning and assembly processes is the subject of technical notes by Farnell Instruments Ltd, of Light Industrial Estate,York Road, Wetherby, Yorks. The examples given include equip- ment for missile-component and control-system work. Standardenvironmental chambers with mechanical refrigeration systems are available with pull-down to approximately —250°F. Whenlower temperatures are required use can be made of liquid nitrogen, helium or hydrogen as refrigerants. Products can besubjected to near absolute zero (—459.6°F) conditions in baths of these cryogenic materials within a cryostat or similar apparatus. Dehydration by means of refrigerator equipment is also awidely-used process. One well-known instrument company manu- facturing gyros containing hydrogen and helium employs chillingequipment in which these gases are chilled to approximately —135 °F before they are pumped into the gyro. There are alsomany instances in the working of metallic raw materials where low temperatures can profitably be employed, and examples given byFarnell Instruments include the use of refrigeration to delay the natural age-hardening of certain aluminium alloys; stress relief inlight alloy castings; and stabilization of steel. An increasingly widely-used assembly process involves expan-sion fitting—the reverse of the familiar process of shrink-fitting, to which it is claimed to be superior principally by reason of the factthat the chilled parts are not metallurgically changed or otherwise damaged, that presses are not required for assembly, and that coldparts are more easily handled than hot ones. Farnell Instruments Ltd are the sole United Kingdom agentsof Cincinatti Sub-Zero Products of Ohio, USA. IN BRIEF Samuel Fox & Co Ltd, a subsidiary of United Steel Companies Ltd, are to spend over £4Jm on a development scheme to expand ingot steel production from 400,000 to 500,000 tons per annum. The College of Aeronautics has ordered a Pegusus digital computer from Ferranti Ltd. Delivery is scheduled for next month, and the equip- ment will be used to teach students the fundamentals of programming and computer techniques, study of which is already included in the curriculum. Appointed to the board of Flight Refuel- ling Ltd is their commercial manager, Wg Cdr Hugh C. Johnson. Throughout his career with the company, which he joined 26 years ago, he has held a senior executive position; and during the Berlin Airlift, in which Flight Refuelling played an important part, he was responsible for organizing the company's effort both in this country and in Germany ' A large Series 80,000 in-line digital dis- play unit, approximately four times the size of the standard Series 600 unit, has been marketed by Counting Instruments Ltd, 5 Elstree Way, Boreham Wood, Herts. This new unit can display a character 3$in high by 2in wide, compared with the lin x in size of the standard type; and its applications include process projection and supervisory control panels, display boards, equip- ment tests and types of instruments calling for fast and easy reading. Ether Langham Thompson Ltd have formed a new subsidiary, Ether Langham Thompson (Italiana), with offices and factory at Bisleri 19, Milan. It is to manufacture and market products of the ELT subsidiary companies, Ether Ltd, J. Langham Thompson Ltd, Electro Methods Ltd, Datum Metal Products Ltd and Automanon Systems & Controls Ltd. In addition, agency agreements have been completed between the Italian company and a number of other companies in the field of instrumentation. The chairman of the new Italian company will be J. Langham Thompson. " " Charles Irving, Dowty public relations adviser, has now been appointed head of public relations to the group. G. W. Thompson has been appointed exhibition manager to the Firth Cleveland group of companies. BTR Industries Ltd announce the appointment of F. S. Lloyd as purchasing officer for the BTR group. He was formerly with, in suc- cession, Mullard, Marconi Instruments and Crompton Parkinson. Standard Telephones & Cables Ltd have equipped a mobile exhibition unit carrying a range of typical components manufactured for the tele- communications and electronics industries. The intention is that the unit shall visit designers and engineers at their own works. Three further Heenan Multiform automatic strip forming machines are to be brought into operation at the Treforest (Glam) works of Simmonds Aerocessories Ltd to meet the increasing demand for the company's Spire Speed Nuts. P. Blandford informs us that he recently relinquished his post as general service manager at Vickers-Armstrongs (Aircraft) Ltd at Wey- bridge, after some 14 years with the company, and has taken an appointment with Ferodo Ltd, the makers of friction materials, at Chapel-en-le-Frith, Derbyshire. From Flexible Veneers Ltd of Cobbs Court Buildings, Carter Lane, London EC4, come details of Agastrip flexible veneer strip (paper- backed) and Agatape flexible veneer tape (self-adhesive). Of actual wood, these materials are used for the edging of chipboard, plywood, etc, to give a neat finish. Cellon Ltd "announce with regret" the decision of W. F. Wilson tn retire from their board upon acceptance of an appointment as consultant to the group. During his 35 years with the company, they add, he has made many friends on both the consumer and production sides of the finishing industry. Sciaky Electric Welding Machines Ltd, in association with Pye Industries Ltd, have announced the formation of an Australian company called Sciaky Australia (Pty) Ltd, to manufacture, install and service resistance welding equipment for the Australasian continent. A new factory under construction at Fairfield, NSW, for the new company is already going into production. •:•••"'
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