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Aviation History
1921
1921 - 0732.PDF
' NOVEMBER IO, 1921 HANDASYDE, LTD. CARLTON HOUSE, 11D, REGENT STREET, LONDON, S.W. 1. " WHEN, a short time ago, Mr. G, H. Handa.syde severed hisconnection with the Martinsyde firm of Woking, of which he had been a partner and technical director for a great numberof years, he founded a new firm under the name of the Handa- syde Aircraft Co., Ltd. The new firm had offices at IID,Regent Street, but these now appear to have been vacated. We have failed to discover that the new firm has a Londonoffice at present, and letters to Mr. Handasyde's private address have remained unanswered. It is, therefore, to beassumed that, at the moment at any rate, this famous designer is not engaged upon actual construction. He is, however,known to have got out the designs for a commercial monoplane of the cantilever type, which is said to incorporate several novel features, such as a wing covered with wood planking,and composed internally of several spars. The undercarriage is unusual in having its points of-attachment on the wings in-stead of direct to the fuselage. This has, presumably, been done in order to get a wider wheel track. The calculatedperformance is stated to be very good, and for the sake of the part which Mr. Handasyde has played in the past historyof aviation, having designed some of the prettiest aeroplanes ever built, it is to be hoped that he will soon be activelyengaged upon the construction of the several highly interesting machines which he is rumoured to be contemplating in thesolitude of his Surrey home. The services of a designc r of such qualifications should not be lost to the industry. HANDLEY PAGE, LTD. CRICKLEWOOD, LONDON, N.W. 2. THE firm of Handle * Page is so well known all over the worldthat any introduction is superfluous. In addition to running the London-Paris air service, the firm is busy on construc-tional and, especially, research work. The branch of the latter which is at the moment receiving most attention isinvestigation into the possibilities of slotted aerofoils. It is now two years since these investigations were commenced,and during that time the Handley Page research department has been busy obtaining data and Striving after improve-ments. That these have been attained will be shown presently when we come to give figures relating to one or two of theHandley Page slotted aerofoils. In the meantime a few words about the difficulties of discovering the " best " slottedaerofoil may be of interest. Quite early in the investigations carried out in the HandleyPage wind tunnel it was discovered that a multiplicity of slots gave higher lift coefficients than a single slot. As,however, the constructional problems of a multi-slot wing are extraordinarily difficult, Mr. Handley Page decided to proceed with single-slot sections first, so as to discover if itshould be possible so to improve these that multi-slot sections could be dispensed with for the time being. It was thendiscovered that much depended upon the shape of the slot, but other features also proved important. For instance, thesize of slot—or, in other words, the amount of air that was allowed to pass through the slot—greatly affected the result.Furthermore, it was found that the angle of the slot was of importance. It will easily be understood that where thereare so many variables, and there are others not mentioned here, much research work must be done before the generallaws of slotted aerofoils can be established. When one remembers the differences in characteristics of ordinaryaerofoils, it will be realised that to evolve the best possible slotted wing is a task of great magnitude. It is of the verygreatest interest to mention, however, that one thing does appear to have been definitely established, i.e. that the-percentage increase in lift obtained by slotting an aerofoil is approximately the same for high-lift sections as for the 1. The Handley Page experimental monoplane. 732
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