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Aviation History
1921
1921 - 0639.PDF
Flight, September 29, 1921 AIRCRAFTENGINEER^ First Aero Weekly in the World Founder and Editor: STANLEY SPOONER A Journal 4«rot*4 I* tk« Interests, Practice, »ni Progress of Aerial Locomotion »»4 Transport OFFICIAL ORGAN OF THE ROYAL AERO CLUB OF THE UNITED KINGDOM No. 666 (No. 39, Vol. XIII.) SEPTEMBER 29, 1921 TWeekly, Price 6d.L Post free, 7d. Flight The Aircraft Engineer and Airships Editorial Offices: 36, GREAT QUEEN STREET, KINGSWAY, W.C.2. I Telegrams : Tniditur, Westcent, London. Telephone : Gerraid 1828 Annaal Subscription Rates, Post Free United Kingdom .. 30s. id. Abroad .. .. 33s. od.' These rates are subject to any alteration fonnd necessary nnder abnormal conditions and to increases In postage rates • European subscriptions must be remitted in British currency CONTENTS Editorial Comment PAGE The Development of Commercial Aircraft 639 Contracting the World 640 Aviation in Australia .. .. .. .. .. .. .. 640 The D.H. 29 Monoplane .. .. .. .. .. .- •• 641 An Immediate Application of Slotted Aerofoils. By " Marco Polo ".. 648 London Terminal Aerodrome .. .. .. .... .. 649 Coupe Deutsch.. .. .. .. .. .. .. .. •• 650 Death of Bernard de Rom anet 651 Royal Aeronautical Society Official Notices 652 DIARY OF FORTHCOMING EVENTS Club Secretaries and others desirous of announcing the dates of important fixtures are invited to send particulars for inclusion in the following list: Oct. 1 .... Coupe Deutscb de la Meurthe Oct. 6 .... Lecture, " Some Notes on Aeroplanes in a Tropical Countries," by Air-Comd. H. R. M. Brooke-Popham, before R.Ae.S. Oct. 20 .... Lecture, "The Langley Machine and the Haminondsport Trials,'' by Griffith Brewer, before R.Ae.S. Oct. 22-30 Aero Exhibition. Prafrne Nov. 3 Pulitzer Trophy Race. HOT. 3 Lecture, " Manoeuvres of - , Landing," by Sq. Ldr. R.Ae.S. tfov. 12-27 Paris Aero Salon Nov. 15-26 International Air Navigation Congress (Paris) Nov. 17 .... Lecture, "Requirements and Difficulties of Air Transport," by Col. F. Searle, before R.Ae.S. Dec. 1 .... Lecture, "Design of a Commercial Aero- plane," by Capt. 6. de Havilland, before R.Ae.S. Dec. 15 .... Lecture,- "Development of the Fighting Aeroplane," by Capt. F. M. Green, before R.Ae.S. Getting Off and R. M. Hill, before 1922. Jan. 5. Jan. 19. Lecture, "Specialised Aircraft," by Wing- Com. W. D. Beatty, before R.Ae.S. Lecture, "Aeroplane Installation," by Brig.- Gen. R. K. Bagnall-Wild, before R.Ae.S. forthcoming trials of the D.H. 29 at Martlesham possess a very large measure of interest, because the machine which is to be tested—and which is fully described in this issue of FLIGHT—is one of a type which marks a considerable advance, in theory at least, over anything which has gone before. To begin with, it is a reversion to the monoplane, a type which was very much to the fore previous to the War, but which fell The into virtual desuetude owing to, mainly, Development the limitations of the constructional Commercial knowledge of those early days. Un- Aircraft questionably, the monoplane has very distinct advantages over other types, given that the requisite strength of construction is attained. Of this latter there can be no reasonable doubt, since the science of design and construction has progressed enormously since the days when the mono- plane was tried and found wanting. The sum of this progress is represented in the D.H. 29 by the adoption of the cantilever principle of construction in the wing design. Not only is the requisite strength of con- struction attained by this method of designing the wing structure, but it has a very high safety factor, even when compared with the best of the biplane machines. It thus marks a very decided advance over previous methods of construction, and one from which a great deal is to be hoped. Naturally, much depends upon the trials which are now about to take place, and in the course of which the machine will be subjected to every species of test which can be devised to test the soundness of the machine itself and the theories underlying the methods of design. More important than this is, we thirfk, the fact that the construction of this machine, designed as it is for commercial purposes pure and simple, is another indication that we are cutting away as far as possible from the commercial-ci#w-military machine, which has hitherto done duty for the most part on such aerial lines as are in being. It may be that in the future the difference between the machine built for war and that designed for peaceful traffic will not represent the gulf which is fixed between the battle- ship and the liner. As to that it is impossible to dogmatise in the light of our present knowledge.
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