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Aviation History
1938
1938 - 0988.PDF
354 FLIGHT. APRTI. 7, 1938. THE INDUSTRY New Address AERONAUTICAL consultants and aerodrome equipmentagents, the Lindsay-Neale Aviation Co., Ltd., have now moved into new premises at 4, Park Lane, London, W.i (Mayfair 8627-8) Major Darwin Resigns "VTAJOR C. J. W DARWIN, D.S.O., has resigned his post •"-*• as managing director of Saunders-Roe, Ltd., of Cowes, Isle of Wight. Messages sent to him at his London address, 10, Montagu Mews, London, N.W.I, will find him. The tele- phone number is Welbeck 1526. Pioneer Seeks Post AFTER three years 111 the Bureau of Information of theNational League of Airmen, Mr. L. Howard Flanders is seeking a post, the League having been closed down. Older readers of Flight will not need to be reminded that Mr. Flanders was one of Britain's pioneer aircraft designers, work- ing at Brooklands from 1909 to 1914. He has had wide experience of secretarial work in connection with clubs and societies and is now looking for a post of that nature in which his intimate knowledge of British aviation from the earliest days should be of considerable value. Retractable Triple Alliance T^HERE is, peihaps, some doubt as to which firm should J- take the credit for the vast retracting undercarriages of the A.W Ensign. Actually, the honours are shared. We understand that Armstrong Whitworth manufactured the oleo legs while Auto- motive Products, of Leamington, supplied the Lockheed hydraulic retracting gear. The undercarriage is operated by a hydraulic jack carried entirely by the retracting strut, and this is a patent of Aircraft Components, Ltd., of Cheltenham. Incidentally, the last-named concern state that they, also, have built 7k. undercarriage jacks—three years ago, for the Monospar Croydon. Instrument-drive Pumps A RANGE of rotary vacuum pumps for instrument operationis being manufactured by Turner's Motor Manufacturing Company, Limited, Wulfruna Works, Moorfield Road, Wolver- hampton. The pumps are made in various sizes and capacities, and are designed for the operation of such instruments as the turn-and-bank indicator, directional gyro and artificial hori- zon. All these pumps are of the type in which a rotor, mounted eccentrically with the body, is fitted with blades or vanes. Smaller pumps have a single blade and larger ones double blades. Throughout their movement the blades are in con- tact with the inner diameter of the pump body, and this con- tact is further ensured by the insertion of special sealing strips in grooves formed in the edges of the blades. An " exploded '' view of one of the Turner pumps. At gliding speed, with the engine running at about 1,000 r.p.m., the pump illustrated has a capacity of 3.5 cubic feet and 4in. vacuum. This is adequate to operate the instruments and the pumps may be run up to 4,000 r.p.m. In order to obtain satisfactory results at all times, in view of the wide range of the pumps, a special relief valve is incorporated in the system, and this is included in the pipe line from the in- • struments to the pump. Usually, the pump is mounted direct on the engine, and oil is fed at normal engine oil pressure through holes in the flange. The pump is not flooded with oil from the engine; the oil is metered into the pump through a special arrangement of pas- sages. An oil separator can be supplied, where necessary, foi reclaiming oil which passes through the pump from the engine In construction, the pump body contains a rotor fitted witi single or double vanes. These vanes follow, without the aid of springs, the internal contour of the pump body. The rotoi is driven through the medium of a special coupling in whicl a cush drive is incorporated. In the double-vane type there are two sizes, and the end flanges of each are interchangeable. Incidentally, this vacuum pump can be used for de-icing equipment. As an indication of the reliability and efficiency of the pumps it may be mentioned that they are standard equipment on Short Empire flying boats and were used on Caledonia during her transatlantic flights last year. Company Meetings THE British Aluminium Company announce that their netprofit for 1037 is £519,340, as compared with £361,158 for 1936. The directors recommend a final dividend of 8J per cent, on the ordinary shares, making 12$ per cent, for the year. * * * The British Thomson Houston Co., announce a gross profit for 1937 of £651,673, compared with £553,714 in 1936. * • » At the adjourned general meeting of Boulton Paul Aircraft, Ltd., held in London recently, Lord Gorell (the chairman) said that the trading profit for the year under review was £20,411, as against £5,759 for the previous year. It was necessary to look upon the period under review as one of con- tinual expansion and growth, so the result could not be con- sidered as other than satisfactory, particularly when it was possible to say that the whole of the former fixed-price con- tracts had now been completed. The extension in floor space to the factory has been success- fully completed with the minimum of interference with pro- duction, and, as the possibility of such expansion was contem- plated in the original design of the factory, the enlarged premises now presented a homogeneous unit. They had production orders in hand and in immediate pros- pect which should keep them working at full capacity at least till the end of 1940. • • • "Both works have been fully employed, and considerable additions have been made to the plants," said Mr. A. A. Jamieson (chairman, Vickers, Ltd.), speaking of Vickers (Aviation), Ltd., at the meeting of the parent company in London last week. Aircraft profits for the year were moder- ately satisfactory. In technical development they had achieved great success. • • • Thos. Firth and John Brown, Ltd., report a total dividend payment for the year of 17J per cent. At the general meet- ing it was leported that new items in the wide range of steel products included ground-thread taps and high-speed carbide cutting tools while the firm had equipped themselves to under- take the boring of jigs for use in engineering production. " Cellophane " T frequently happens that a firm which has pioneered the manufacture of any particular article or substance finds that its registered trade name for that substance comes to be used asa " household word " applied indiscriminately to the genuine article and imitations alike. An example is that word "Cellophane." The makere< British Cellophane, Ltd., St. Martins-le-Grand, London, E.C.i, point out that the name is a registered trade mark denoting their own transparent cellulose sheet and film. I ! Publisher's \ EASTER Announcement HOLIDAYS | fyJISCELLANEOUS Advertisements intended I the issue of April 14 must be in our hands by ] post on Monday, April j The issue will be on | Wednesday, April 13. II. sale one day earlier, u- for hrst on
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