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Aviation History
1926
1926 - 0009.PDF
JANUARY 1926 AERONAUTICAL RESEARCH COMMITTEE REPORTS FROM the number of enquiries we receive it appears that there is a desire in aircraft circles to know approximately the contents of the various technical publications of the Aeronautical Research Committee. All the aircraft firms probably receive these reports regularly, whether or not they contain anything of immediate interest or utility. In the case of draughtsmen, however, and others interested in aeronautics, who can hardly be expected to purchase all the reports, the problem of deciding whether any publication interests him is often a difficult one. As it is obviously desirable that the knowledge of aeronautics should be made available to all who take an interest in the subject, we have arranged with the Air Ministry to publish in FLIGHT summaries of all the technical publications as soon as these are issued, or shortly before they are published. All A.R.C. publications can be purchased from H.M. Stationery Offices at Adastral House, Kingsway, London, W.C.2 ; 28, Abingdon Street, London, S.W.I ; York Street, Manchester; 1, St. Andrew's Crescent, Cardiff ; 120, George Street, Edinburgh, and through any bookseller. The Rolling and Yawing Moments of an Aerofoil in Straight Flight. By H. Glauert, M.A. Presented by The Director of Scientific Research. R. & M. No. 980. (Ae. 193]. (5 pages.) July, 1925. Price 3d. net. A difficulty inherent in almost all present-day aeroplanes is the fact that the use of the ailerons imposes on the aero- plane a yawing moment as well as a rolling moment. This difficulty has been overcome by the slot-and-aileron control which is described in R. & M. 968 (Full-scale tests of a new slot-and-aileron lateral control. By H. L. Stevens). The present report deals with the method of calculating this yawing moment for a given amount of roll on a conventional aeroplane, using an analysis of the same type as that deve- loped by Prandtl in his Vortex Theory of Aerofoils. The yawing moment is due partly to the profile drag, and partly "to the induced drag of the aerofoil, and calculations of the induced yawing moment for certain special cases are given in recent papers by Munk and Scheubel. The analysis of the problem by means of Fourier series leads to a simple solution in the general case, and the relation- ship between the rolling moment and the induced yawing moment referred to wind axes is found in terms of the load distribution across the span of the wing. t- The induced yawing moment can be reduced to some extent by the use of tapered wings whose tip chord is less than half the central chord, but the possibility of obtaining no yawing moment about the wind axes depends on some device, such as the slot-and-aileron control which introduces a profile yawing moment of the opposite sign to the induced yawing moment. An Experimental Investigation into the Properties of Certain Framed Structures having Redundant Bracing Members. Report No. 3. By Prof. A. T. Sutton Pippard, M.B.E., D.Sc, and G. H". W. Clifford, M.Sc. R. & M. No. 977. (Ae. 191.) (12 pages and 1 diagram.) September, 1925. Part4.—An Experimental Investigation of the Applicability of the Principle of St. Venant to a braced tubular framework. Price 6d. net. The problem of redundancy is common to all engineering construction, but it is not known how far the redundancy affects the strength as a whole. A long research on this subject was commenced eighteen months ago, and two pre- vious papers have been published as R. & M. Nos. 948 and 971.* All the experiments have been carried out on a braced tubular framework, three bays in length, each bay being hexagonal, as the theoretical equations for this case had been worked out and published in another paper, R. & M. 800.f The conditions of the present experiment were designed to accord with the Principle of St. Venant so as to deter- mine the effect of the number and disposition of redundancies on its operation. The experiments show that with efficient bracing in the plane of the applied load system the stresses tend quickly to become independent of the arrangement of that system, and with additional bracing elsewhere a much quicker equal- ization of stress is produced. * R. and M. 948 comprises Parts 1 and 2 of the investigat'on. R. and M.971 comprises Part 3. t R. and M. 800. " Report of the Airship Stressing Panel." ROYAL AERONAUTICAL SOCIETY (Official Notices) Conversazione.—Sir Samuel Hoare, Secre- tary of State for Air, has kindly consented to attend the Society's Conversazione on Tuesday, January 12, which is being held to celebrate the Society's sixtieth birthday. H.I.H. Prince Chichibu will also be present. Members and their friends will have an opportunity of inspecting the wonderful collection of exhibits in the Aeronautical Section of the Science Museum, which are the most numerous and representative of any collection in the world. The String Band of the Royal Air Force will play during the evening and refreshments will be provided. Lecture.—The first lecture of the second half of the Sixty- First Session is being held to-day, January 7, at 6.30 p.m. in the Library at 7, Albemarle Street, W.I, when Professor A. J. Sutton Pippard, D.Sc., F.R.Ae.S., will read a paper on " The Experimental Stress Analysis of Frameworks with Special Reference to the Problems of Airship Design." Programme of Lecttires.—Particular attention is drawn to"1 the change of time of the Society's lectures, from 5.30 p.m. to 6.30 p.m. The following programme has been arranged :— Thursday, January 21, 6.30 p.m.—In the Library. Lecture, "The 'Schneider Cup Race, 1925," by Major J. S. Buchanan, Associate Fellow. Thursday, February 4, 7 p.m.—Joint Meeting with Inst. Automobile Engineers at the Royal Society of Arts. Lecture, " American Aircraft Engine Development," by Mr. C. L. Lawrance. Thursday, February 25, 6.30 p.m.—In the Library. Lecture, " Long Distance Aeroplane Flights," by Mr. A. J. Cobham. Thursday, March 4, 6.30 p.m.—In the Library. Lecture, " Tlie Development of Airship Mooring and Handling," by Major G. H. Scott, G.B.E., A.F.C., Associate Fellow. Thursday, March 18, 6.30 p.m.—In the Library. Lecture, " Handling Aeroplanes in Fog," by Flight-Lieut. H. Gooch. Thursday, April 15, 6.30 p.m.—In the Library. Lecture, " The Tailless Aeroplane," by Capt. G. T. R. Hill, Associate Fellow. Thursday, April 29, 6.30 p.m.—In the Library. Lecture, " The Results of Recent Airship Flight Tests," by Lieut.Col. V. C. Richmond, O.B.E., Associate Fellow. Students' Section— Thursday, January 28, 6.30 p.m.—In the Library. Informal Discussion on " Air Travel." Mr. Handley Page, Fellow, in the Chair. Saturday, February 6.—Visit to Croydon Aerodrome. Meet at Trust House Hotel Entrance at 3.0 p.m. sharp. Captain H. R. Gillman, Associate Fellow, will conduct the party round. Thursday, February 18, 6.0 p.m.—In the Library. Lecture and Discussion, " Bernoulli and Aerodynamics," Mr. M. S. Hooper. Saturday, February 27.—Visit to the de Havilland Aircraft Company's Works at Stag Lane Aerodrome. Thursday, March 11, 6.0 p.m.—In the Library. "Experi- mental Flying from the Pilot's Point of View," by F/O. 11. L. Ragg. Thursday, March 25, 6.0 p.m.—In the Library. Lecture and Discussion " Stalled Flying " by Mr. S. S. Hall. Thursday, April 8, 6.0 p.m.—In the Library. Lecture (to be announced later). Further visits to be arranged for May and June. Will those Students who wish to take part in any visit kindly let the Secretary know as early as possible, so that the neces- sarv arrangements can be made. J. LAURENCE PRITCHARD, Honorary Secretary.
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