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Aviation History
1924
1924 - 0236.PDF
The riveted joints in the -095 in. annealed sheet showed the "following values in lbs. per sq. in::— /, = 32,700 /, = 42,800 /, - 62,300 All of the tension failures both in the riveted joints and in the plain specimens occurred as shear along a 45" plane. The crushing failures appeared to be crushing of the plate and not of the rivets, although the plate, beipg heat-treated, has the higher theoretical strength of the two. The shearing failures were instantaneous, as opposed to the gradual dis tortion which preceded a failure by crushing or tearing. The chemical analyses of the three thicknesses of sheet are given below :— Thick ness ins. •020 •040 •095 Cu. 4-21 4 04 4-16 . Fe. -•41 •38 •42 Si. •26 •23 •26 Mn. •40 •38 •39 Mg. •82 •87 •82 Remainder, aluminium. H H Surveys from the Air IN regard to the reported completion of the aerial-survey of the Irrawaddy Delta in Burma—which has been carried out under the direction of Mr. Ronald Kemp, late Chief Inspector of Aircraft in India—Major H. Hemming, Managing Director of the Aircraft Operating Co., writes as follows :— "The significant fact that 1,350 square miles have been successfully mapped from the air is of special interest to my company, as I was actually discussing the then proposed survey with my friend, Major Kennedy-Cockran-Patrick, on January 17 of this year. He left England on January 18 in order to do the actual photographic flying with Mr. Ronald Kemp, and now we hear that the survey is completed. The actual time taken from when Major Patrick sailed up to the time of your correspondent's report is under 12 weeks, and within that period he has travelled to Burma, the machines and instruments have been tested, and the survey completed —surely a feat reflecting the greatest credit on Mr. Kemp, Major Patrick, and all those associated with the work. '' It might be interesting to know how long it would take to survey the actual area by ground methods ; probably the swampy and dense nature of the area would make a ground survey an impossibility. I understand that a fair estimate for this type of ground survey work is that it takes one man one day to survey a quarter square mile as regards the field work. Therefore, if three men were employed on this work on 28 working days per month, they would take approximately 5J years to do the field work for the area stated. One is assuming that outside the mechanic and photographic assist ance Mr. Kemp is employing three experts, i.e., the pilot, the observer, and the chief photographer; therefore, the com parison is most interesting. The feat is all the more interesting when it is considered that the work was carried out using old De Havilland type 9 aeroplanes, fitted out as seaplanes, and also the old type L.B. plate camera. With modern equip ment "far better results could be achieved. "It is to be hoped that present results will drive home the value of aircraft for exploration and development to the The only noteworthy result of the tests for slippage of the joints is that in all cases a redistribution of load takes place at the lower stresses, as is evidenced by the different amounts of slippage at differnet points along the joint. In general the slippage is small and unimportant. Methods of Test.—The plain tensile specimens were tested in the usual manner. Owing to the thinness of the sheet and to the unevenness found in the smoothest of metal jaws it was necessary to use the peculiar form of specimen shown in Fig. 2. The notches cut at the ends were to receive plugs fitted into the testing machine jaws. Several of the more common types of ends were tried, but failure generally occurred in the jaws until the above was adopted. The riveted specimens were made with 5 half-inch bolt holes in the end (Fig. 3) by which they were clamped into a pair of special jaws made without serrations. These jaws, in turn, were fastened into the testing machine. Slippage of the joint was noted by measuring the distance between two scribed lines under a magnifying lens. H E various authorities, both at home and abroad, as well as to the business man." One of the two D.H. machines employed has practically done all the work, having flown a total of about 10,000 miles and exposed 3,000 photographic plates. The piloting work was carried out by Major Kennedy-Cockran-Patrick, and the photographic work was directed by Flying Officer Dumard (lent by the R.A.F. in India.) The Air Dispute JUST as we go to press it is learned that, although no actual decision has been taken at the time of writing, there is hope of a settlement in the dispute between pilots and engineers on the one hand and Imperial Airways, Ltd., on the other. Both parties have very wisely refrained from making public any details of the negotiations during the last few days, but it is believed that a solution is about to be found, and we hope to be able to announce in next week's issue that an agreement satisfactory to both parties has been reached. One of the main points—-the right of the pilots to have a voice in the matter of suitability for flying on any particular machine or under any given weather conditions—is believed to have been agreed to by the com pany, and it is firmly expected that the unfortunate deadlock will not for much longer delay the start of flying, which has now been suspended for nearly a month. Curtiss-Reed Metal Airscrews in Europe ARRANGEMENTS have now been completed for the manu facture under licence in Great Britain and France of the Curtiss-Reed Duralumin airscrews with which the Curtiss- Navy racers were fitted'in the Schneider Race at Cowes last year. The concession for Great Britain has been acquired by the Fairey Aviation Company, of Hayes, Middlesex, while the French rights have been secured by Pierre Levasseur, 17, Place Felix-Faure, Paris. At present these are believed to be the only European rights disposed of. Until arrange ments have been completed with other countries inquiries should be addressed to the Fairey Aviation Company. A-.FRENCH RECORD-BREAKER : The Farman " Goliath" fitted with floats on which Georges- Rene established a world's altitude record for seaplanes carrying a useful load of 1,000 kgs., at St. Raphael °? ^ fio \ i.ght lastin£ l hr- 20 mins. he reached an altitude of 3,300 m., thus beating the previous record ol i,\SZ m. made by E. Dolecek (U.S. Air Service) on an F-5-L flying boat. The above " Goliath " is fitted with two 230 h.p. C.U.Z.9 Salmson engines. 236
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