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Aviation History
1940
1940 - 1164.PDF
368 APRIL 18, " Flight " photograph. GETTING TOGETHER. Alan S. Butler pays a flying visit to the Duke of Richmond at the new Hordern-Richmond factory. electromagnetic crack detector, whereas such inspection on a V-threaded bolt would probably not show up a crack at the bottom of the thread. The insert, which is of slightly greater diameter than the tapped hole, is screwed in by the use of a screw-driver type of tool with a slot engaging the end of the wire, which has been turned diametric- ally across the helix. The turning tends to contract the helix, which goes in re- markably smoothly. It cannot be un- screwed with the same tool as such action would expand the helix and make it grip the hole more tightly, but a very simple tool which grips the other end of the helix causes contraction and so extracts it. Its natural expansion in the hole gives it sufficient friction to prevent movement when the bolt is screwed in. When applied to holes for spark plugs, the system is claimed to give better conduc- tivity and so to aid in cooling the plug. The explosive rivet was originated at the Heinkel works in Germany, but has now been developed further by the Du Pont interests in America. Its ad- vantages are obvious in all those places —and they ars numerous—where holding- up is difficult. It is not necessary to get to both sides of the member being riveted, as "heading" is done by the explosion of a small charge in a hollow in the shank. In tubular members it can supplant the long rivet and the fer- rule, both of which require a distance tube, and the attachment of skin is an- other place in which it should be very useful, particularly for putting on patches over bullet holes. Its principal advantage over the pop rivet lies in its strength, for it is a solid rivet. The hollow part is almost entirely in the "head." The explosion, by its action, opens the rivet out against the plate and also tends to pull the plates together. Rivets are exploded by heat applied by an electric- or a benzine- heated "gun." The previous objection to the rivet, that the products of the ex- plosion were corrosive, is stated to have been overcome. The samples of riveting seen bore out the claim that uniformity of head shape had been attained. Whether uniformity of strength has also been attained is not known, as strength test data were not available. One sample showed three thick- nesses of Jin. steel plate riveted together by explosive rivets made of steel. The method of filling each with the exact amount of explosive is ingenious. The rivets are placed, heads underneath, in holes in a plate whose thickness is- exactly equal to the shank length. On top of this plate, another plate, with holes drilled to the same pattern, is placed, but with its holes displaced slightly. The explosive is then spread over the top plate and brushed in till the holes are full, any surplus being re- moved. The top plate is then moved till all the holes coincide and the ex- plosive goes into each rivet shank. A coat of shellac, when dry, retains the charge. Rivets are all dyed a distinctive colour to indicate length of shank and are supplied with various head shapes. The Civil Aeronautics Authority has been approached to give this rivet its approval in structural use as well as unstressed parts, but the decision is not yet known. Capt. Percival holds the rights for these two devices and may be communi- cated with at 46, Upper Grosvenor Street, London, W.i, or Grosvenor 2895. De Hav'dtand and Hordern-Richmond LIGHT learns that the De Havilland Aircraft Co., Ltd., has acquired an interest in Hordern-Richmond Aircraft, Ltd. Mr. A. S. Butler, who is chairman of the De Havilland concern, will re- present his com- pany's interest on the Hordern- Richmond Board. The Duke of Richmond a n d An example of the explosive rivet. THE INDUSTRY (CONTINUED) Gordon with Edmund Hordern origin, ally formed the company with the intention of producing aircraft " of their own design, but as the time did not appear propitious, effort was con- centrated on the production of wooden airscrews, with an eye on plastics and compressed woods for the same purpose at a later date. They are fortunate in having with them Mr. Lang, whose experience of air- screw making goes back some 28 to 30 years, and also Mr. Tony Fletcher as chief designer, whose well-known ability is founded on many years valuable knowledge. A big factory is in the final stages of erection, and production should commence very shortly. The Board and Management of Hor- dern-Richmond Aircraft, Ltd., as at present constituted is: Chairman, The Duke of Richmond and Gordon; Man- aging Director, E. G. Hordern; Direc- tors, A. A. D. Lang, H. S. Kcvill- Davies, C. Campbell, A. S. Butler, and C. D. Harrison; Chief Designer, A. A. Fletcher; Works Manager, A. J. Stevens; Secretary, W. J. Drummoiul. Airspeed (1934), Ltd. THE directors of Airspeed (1934),Ltd., announce that arrears of divi- dend on the preferred ordinary shares at the rate of 6 per cent, per annum, less tax, for the eighteen months ended December 31, 1937, will be paid on April 30, 1940, out of profits for the year ending July 31, 1940. Drawing Service •.G AVIN Starey Aviation Drawing Ser- vice, who have hitherto specialised in aviation publicity drawings and dia- grams, have now extended their activi- ties to include a full technical drawing service. Their intention is to make available to the aircraft industry a concern wheie overflow drawing office work or instruc- tion book illustrations will be handled by artists experienced in the presenta- tion of engineering details. Their address is 28, Southampton Street, Strand, W.C.2. .-•:.:"->:i•••v;r Nickel News '"PHE current number of Monel Notes J- includes articles on the manufactuie of Inconel exhaust manifolds, the hardening of K Monel and factors in- volved in the selecting of a spring material. This issue will no doubt in- terest the numerous firms who are now using Monel, Nickel and luconel for the first time. Copies are to be had from Henry Wig- gin and Co., Ltd., Thames House, Mill- bank, London, S.W.i. PUBLICATIONS RECEIVED Brazing: Principles, Materials and Methods ; is..Emmott ami Co., Ltd., 31, King Street West, Manchester, 3. . Aeroplane Maintenance and Operation Series, Vol. I.: Carburettors (Part I), 5s.; Vol. II: ln- struments (Part I), 5s.; Vol. HI: Landing Legs. Wheels and Brakes, 5s.; Vol.. IV: Airscrew (Part I), 5s.; George Newnes, Ltd., Tower House, Southampton Street, Strand, London, W ^ .2. New and drastic Government restric- tions upon paper -which came into jorce this week, make it imperative for readers to place a definite order for FLIGHT. >n the future newsagents will only dfinana pom the publisher those copus ]° which orders have been received.
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