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Aviation History
1925
1925 - 0298.PDF
METAL AIRSCREW PROGRESS WE have, from time to time, published reports on the development of the all-metal airscrew, both in this and other countries, for the importance of this subject undoubtedly calls for more than passing consideration. In America, as no doubt most of our readers are aware, no small amount of success has been achieved with the Curtiss-Reed all-metal airscrew manufactured by the Curtiss Aeroplane and Motor Co., of Garden City, N.Y.—and which" is manufactured in this country by the Fairey Aviation Co., of Hayes, Middlesex. This week we are able to report another advance in metal airscrew development, viz., the first tests in actual flight with a single-piece magnesium airscrew. These tests were carried out (on. February 6 last), at Curtiss Field, Garden City, on a J1 Standard equipped with a Curtiss C .6 engine and piloted by M. 'M. Merrill, one of the Curtiss pilots. Previous to these tests, the propeller was given a ten-hour whirling test with 100 per cent, overload (300 h.p.), under direction of the Armv Engineers at McCook Field, Dayton, and passed all requirements. These tests prove that mag- nesium alloy has the physical qualities necessary for pro- peller construction. The significant feature of this alloy is its weight- -25 per cent, lighter than duralumin. A magnesium propeller can THE CURTISS-REED ALL-METAL AIRSCREW : Thelatest development of the all-metal airscrew, made from a single piece of magnesium, which comes outlighter than an airscrew made of duralumin. utilise all the qualities which make metal propellers superior to v.ood, and, in addition, will weigh no more, and in many cases less, than a wooden propeller designed for the same type of machine. This propeller was made from a rolled plate of magnesium alloy containing 96 per cent, magnesium and 4 per cent, aluminium, supplied by the American Magnesium Co, of Niagara Falls, which Company deserves credit as it was only after research and experiment that it was able to produce a plate of sufficient size—the largest ever made. In fact, this development is a notable feat of metallurgy. Now that it is accomplished, the American Magnesium Co. advises that it will be possible to b:iild plates large enough for any standard type of propeller. The finishing and twisting was done by the Ourtiss Aeroplane and Motor Co., Inc., under the direction of S. A. Reed, inventor of the famous Curtiss-Reed Duralumin Propeller. The work was carried out under the Curtiss- Reed patents along lines substantially the same as those employed in the manufacture of the duralumin propellers. The Curtiss Company and Mr. Reed are planning to con- tinue the tests and experiments along constructive lines with the idea of eventual production. Naturally, this develop- ment depends to a large extent on the price of magnesium, and •while it is too early yet to determine this, the officials of the American Magnesium Co. believe that the price may compare favourably with that of duralumin. MAY 14, 1925 PUBLICATIONS RECEIVED Aeronautical Research Committee, Reports and Memoranda : No. 934 (Ae. 155).—Wind Channel Tests on Radiators. By R. G. Harris and W. K. Alford. August, 1922. Price Is. net. No. 942 (Ae. 162).—The Royal Aircraft Establishment Con- trol Movement Recorder, Mark III. By D. A. Jones and H. L. Stevens. October, 1924. Price 6^. net. No. 943 (Ae. 163).—Test of Three Aerofoils Suitable for High Speed, A.D.I, Sloane, and R.A.F. 26. By F. B. Bradfield and A. S. Hartshorn. October, 1924. Price 6d. net. No. 944 (Ae.. 164).—Measurement of Pitching Moments due to Roll on Wings of Avro 504K. By F. B. Bradfield. November, 1924. Price Ad. net. No. 945 (Ae. 165).—Lift and Drag of Junker Monoplane, Comparison of Model -with Full Scale Results. By B. D. Clark and others. November, 1924. Price 9d. net. No. 946 (Ae. 166).—Theory of the Design of Aerofoils, with an Analysis of the Experimental Results for the Aerofoils R.A.F. 25, 26, 30 to 33. ByH. Glauert. Novem- ber, 1924. Price 6d. net. No. 948 (Ae. 168).—An Experi- mental Investigation into the Properties of Certain Framed Structures having Redundant Bracing Members. By Prof. A. J. Sutton Pippard and J. F. Baker. December, 1924. Price 1.9. 3d. net. H.M. Stationery Office, Kingsway, London, W.C.2. Pictorial Calendar, May, 1925, to April, 1926. William Beardmore and Co., Ltd., Glasgow. The Royal Arr Force Memorial Fund,. Fifth Report. Jan- Dec, 1924.—The Royal Air Force Memorial Fund, 7, Iddes- leigh House, Caxton Street, Westminster, S.W.I. Taschenbuch der Luftflotten IV 1924-25. Compiled by Dr.-Ing. Werner von LangsdorfL J. F. Lehmanns, Munich, Germany. The Rigid Airship : A Treatise on the Design and Performance. By E. H. Lewitt. Sir Isaac Pitman and Sons, Ltd., Parker Street, Kingsway, London, W.C. Price 30s. net. Rendiconti Tecnici, March 15, 1925.—Direzione Superiore del Genio e delle Costruzioni Aeronautiche, Viale Giulio Cesare, Rome. Price I,.40. NEW COMPANIES REGISTERED FAIREY AVIATION CO., LTD.; Registered Office, Cranford Lane,Hayes. Middlesex.—Nominal capital £10,100, in (\ shares (10,000 preference and 100 ordinary). The objects are :—To adopt an agreement with theFairey Aviation Co., Ltd. (incorporated in 1921), and its liquidator; to manufacture and deal in aeiial conveyances and aircraft of all kinds, andthe component parts thereof, including engines and all kinds of machinery, and apparatus for use in connection therewith, etc. First directors: C. R.Fairey, F. G. T. Dawson ; C. O. Crisp, Lieut.-Col. V. Nichol, D.S.O , D.S.C. C. R. Fairey, F. G. T. Dawson and C. O. Crisp are permanent.NORTH-EAST COAST AUTOMOBILE AND AVIATION COMPANY, LTD., E " A " Floor, Milburn House, Dene Sfeet, Newcastle upon Tyne.—Capital £100, in £\ shares. Manufacturers of and dealers in automobiles, aeroplanes, etc. First Direc.ors, P. L. Hunting and G. L. Hunting. x mAERONAUTICAL PATENT SPECIFICATIONS Abbreviations : Cyl. = cylinder ; i.e. = internal combustion ; m. = motor.The numbers in brackets are those under which the Specifications will be printed and abridged, etc. APPLIED FOR IN 1924Published May 14, 1925 6,247. FAIREY AVIATION CO., LTD., and C. K. FAIREY. Spars for aircraft.(232,387.) 8,109. LORD INVERNAIRN (W. BEARRMORE) and A. E. I.. CHORLTON. Valvegear for multi-cyl. i.e. engines. (232,399.) FLIGHT The Aircraft Engineer and Airships 36, GREAT QUEEN STREET, KINGSWAY, W.C. 2.Telegraphic address : Truditur, Westcent, London. Telephone : Gerrard 1828. 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