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Aviation History
1923
1923 - 0145.PDF
MARCH 15, 1923 lower flanges to the other. The rib to which the outer ends of the camber tubes are hinged occurs in line with the inner end of the ailerons, and as the tubes take their fulcrum at this point it will be seen that the outer portion of the wing does not have its camber altered, while the central portion has its camber progressively changed as the centre-line is approached. Thus the inner portion of the wing, where the chord is greatest, receives a maximum of change, while the tips remain unaffected. While this may to a certain extent reduce the effectiveness of the camber gear, it facilitates construction, and with the tapered wing the central portion, which includes the maximum area, is mostly affected. The wing is mounted above the fuselage on struts, and it will be seen that, whereas there are struts directly supporting the front spar, the rear spar is supported indirectly by a channel-section steel member of triangular plan form, against the sides of which the roots of the rear spar abut. The accompanying diagrams should make the principle clear, and as it is highly probable that the details will be altered in later machines, we have not thought it of any interest to publish sketches of the particular manner of giving effect to the fundamental principle. The wing construction appears to be open to criticism on ---•• -.s ;- ••••. - - • £[• H The Czech Society of Great Britain and Sir CharlesWakefield SIR CHARLES WAKEFIELD, Bt., has been elected Chairman of the Czech Society of Great Britain in place of 'Sir Samuel Hoare, M.P., who resigned owing to his appointment as Secretary for Air. The Aero Philatelic Club So keen is the interest in collecting Air Mail stamps and covers amongst a large section of philatelists it is gratifying to note that this particular branch of that fascinating hobby has now a club of its own, known as the Aero Philatelic Club. This is, we believe, the first time a club has been formed which is devoted entirely to one particular section of stamp collecting. The inaugural meeting of the Aero Philatelic Club took place account of the method which has been adopted of stitching the top fabric to the top flange only, and not through to the lower flange. This was, however, necessary in order to enable the wing to change its thickness simultaneously with the change in camber. The effect of the camber gear is to change the section in the centre from a flat-bottom camber, thick-section, to a thinner, deeply cambered section. As this is what is required (thick wings with flat or convex bottom camber having a low lift and a high value of L/D, while thin deeply-cambered wings have a high lift coefficient but a relatively inferior L/D), it may be expected that the wing will give extra speed range, although to how great extent yet remains to be seen. In the meantime, the machine, as already stated, is being overhauled at Waddon, and Major Grant is having it strengthened up wherever it seems to him to require it. The machine arrived without engine, and an engine from the large stocks of the A.D.C. is being put in, probably a Clerget or le Rhone. It will be interesting to learn the results of actual flying tests, and should these be promising it is easy enough to visualise detail improvements upon what is, after all, but a relatively crude experimental wing, built as cheaply as possible in order to test an idea. on March 3 at the residence of Mr. Harold L. Hayman, 16, Upper Phillimore Gardens, W. 8, when Brig.-Genl. R. Ridgway was elected President, and Mr. Harold L. Hayman Hon. Secretary and Treasurer. The main business of the meeting was the drafting of the rules of the Club. The points of interest in these was the decision to limit members to amateur collectors (of both sexes) of the British Isles, to have an entrance fee of 10s. 6d. (not leviable on members joining previous to June 1, 1923), and an annual subscription of £1 Is., and the establishment of an Exchange Section. A number of keen collectors have already become members. The Hon. Secretary will be glad to hear of any ladies and gentlemen wishing to become members. The next meeting will be held on April 20. THE BRISTOL "LUCIFER" ENGINE UNIT: Our photographs show the engine as a complete unit, including exhaust ring, exhaust pipes from silencer to ring, with expansion joints, and a tail pipe passing through the carburettor heater. The engine is now supplied with non-reversible hand-starting gear in conjunction with a half-compression device. The oil-cooling system is also supplied as standard, and if desired the pressed-steel swinging mounting shown can be supplied as a standard part of the unit. 145
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