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Aviation History
1925
1925 - 0060.PDF
JANUARY 29, 1925 AT THE FAIREY WORKS : A corner of the new experimental shop is at present being used for float-building. All Fairey floats are now boat-built of two skins of mahogany. No three-ply is used. was fitted with a Levasseur-Reed Duralumin airscrew. Incidentally it may be mentioned that the Gloucestershire racing seaplane which was to have competed in the Schneider race in America was fitted with a Fairey-Reed propeller, and that we saw it at the works, apparently none the worse for its submersion after the crash of that machine. Concerning the Fairey machines themselves nothing may be said at present, but accompanying these notes are a few sketches and photographs which show certain interesting constructional features, and a detailed description of the " Flycatcher " must be deferred to another occasion. Suffice it to recall that this machine is produced both as a land machine, fitted with the Fairey oleo-pneumatic undercarriage, and as an amphibian float seaplane, with the wheels built into the bottom of the floats, in which latter form the machine hab been seen at Croydon. AERONAUTICAL RESEARCH COMMITTEE REPORTS Summaries to be Published in "FLIGHT" 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 thecase of draughtsmen, however, and others interested in aeronautics who cannot afford 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. Reports and Memoranda, No. 916 (Ae. 142). Slot Control on an Avro with Standard and Balanced Ailerons. By F. B. Bradfield. Price Is. net. The effect of a slotted leading edge used in conjunction with ailerons was investigated with a view to improving the control when stalled. In order to obtain an estimate of the efficiency of the con- trol, rolling and yawing moments were measured both with standard unbalanced and with balanced ailerons, for a range of slot openings, and hinge moments were measured both for the auxiliary aerofoil which forms the leading, edge and for the balanced ailerons. The results indicate that at, and above, stalling a large increase in rolling moment may be obtained by the use of combined slot and aileron control, the yawing moment being reduced, and in some cases reversed in sign. Slot and aileron controls are not additive, and the slot alone is ineffective up to 20 deg. incidence.) The use of balanced ailerons will allow large aileron angles to be used at stalling, thus using the slots to the best advantage, and from the results it would appear that the device should be of considerable value as control at low speeds is improved greatly if rolling moments can be put on a machine without the usually accompanying yawing moment It is understood that a design for full scale experiment is in hand, and that further model work on. an Avro biplane using the rolling balance is contemplated. No. 923. (M. 27.)L. Aitchison, D.Met.. ColdB.Sc.,.Reports and Memoranda, Work and Fatigue. ByF.I.C. Price 3d. net. Gough and Hanson have stated elsewhere certain opinions (a) that slipping within a crystal is unidirectional in fatigue as in static loading, (b) that as a result of slip at one position in a crystal the metal in and about the plane of slip is har- dened to an extent sufficient to resist any immediate further slipping. It was desired to investigate these opinions by fatigue experiments, and the present experiments have been mainly directed towards measuring the increase of hardness or strength in the metals, as a result of fatigue. The specimens—various steels, brass and copper—investi- gated had been run in the Haigh machine for an extended time, some to fracture and some for several million cycles ; and their Brinell number was determined for both the butt end and the parallel portion. The results obtained were not sufficiently regular to give a thoroughly reliable result, but the indications all point in the expected direction, namely, that the value of M falls due to fatigue stressing. The results also appear to indicate that the effect of fatigue stresses upon metals does not differ widely from that of other stresses. In general, it would seem that the fatigue strength of a material is controlled by its capacity for cold work. 60
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