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Aviation History
1928
1928 - 0205.PDF
Flight, March 22, 1928 ENGINEER. First Aeronautical Weekly in the World. Founded January, 1909 Founder and Editor : STANLEY SPOONER A Journal devoted to the Interests, Practice, and Progress of Aerial Locomotion and Transport OFFICIAL ORGAN OF THE ROYAL AERO CLUB OF THE UNITED KINGDOM No. 1004. (No. 12. Vol. XX.) MARCH 22, 1928 rWeekly, Price 6d.L Post free, 7d. Flight The Aircraft Engineer and Airships Editorial Offices: 36, GREAT QUEEN STREET, KINGSWAY, W.C.2. Telephone: Holborn3211. Telegrams: Truditur, Westcent. London. Annual Subscription Rates, Post Free. United Kingdom .. 30s. 4d. Abroad .. .. 33s. 0d.* * Foreign subscriptions must be remitted in British currency. CONTENTS Editorial Comment: PAGE Safety in Flying 185 Britain Abroad 6 Surveying the Zambesi River .. .. .. .. .. .. 187 Finnish Air Pageant 188 Air Estimates Debate 191 Royal Aero Club Official Notices 192 Bendix Wheel and Brake 193 Air Routes of India 4 Private Flying : Slotted Wings 195 Light'Plane Clubs 197 Airisms from the Four Winds .. .. .. .. •• •• 199 In Parliament 200 Royal Air Force 1 Imports and Exports 202 Air Ministry Notices 2 Personals 202 "FLIGHT" PHOTOGRAPHS To those desirous of obtaining copies of "Flight" Photographs, these can be supplied, enlarged or otherwise, upon application to Photo. Department, 36, Great Queen Street, W.C.2. For Sizes and Prices, see Advert, on page i. DIARY OF CUERENT AND FORTHCOMING EVENTS Club Secretaries and others desirous of announcing the dates of important fixtures are invited to send particulars for inclusion in this list — 1928 Mar. 24 .... Rugby, R.A.F. v. Army, at Twickenham Mar. 24 .... 28 Sqdrn. R.A.F. Old Boy's Association Social Mar. 27 .... Annual General Meeting of R.Ae.S. and Inst.Ae.E. Mai. 28- Apl. 4 Apl. 7 Apl. 8-9 Apl. 12 Exhibition of Light Aeroplanes, Folkestone Drill Hall. Cinque Port3 Flying Club Demonstration, Lympne Aerial Display, Suffolk Aeropiane Club, Hadleigh. " Some Aspects o! the Development o£ the Slot." Mr. G. R. Volkert, before R.Ae.S. & Inst.Ae.E. INDEX FOR VOL. XIX. The Index for Vol. xlx of " Flight " (January to December, 1927) is now ready, and can be obtained from the Publishers,36, Great Queen Street, Kings- way, W.C.2. Price Is. per copy (Is. Id. post free). EDITORIAL COMMENT HE history of the Handley Page aerofoil slot is a somewhat peculiar one. Originally invented almost simul- taneously in this country and in Germany, by the Handley Page firm and Herr Gustav Lachmann, res- pectively, the wing slot was at first regarded as a means of giving extra lift. The auxiliary aerofoil was mechanically operated and a number of various types of it were experimented with. Then came a period when Safety modern aerodynamic aerofoil theory Flying seemed to indicate that the main function of the slot was confined to the relatively limited utility of reducing the chord, the wing span being irreducible from considerations of induced drag, with the possible exception of pure racing machines, in which, owing to the enormous excess of power, the absence of any need for a good climb, and the fact that at high speed the induced drag is negligible, the lift slot might with advantage, be employed. The next period, very possibly influenced by some such considerations as these, was marked by the introduction of the slot as a means of obtaining power- ful lateral control, accompanied by a very small yawing moment, or even by one of opposite sign, so that the use of the lateral controls at or near the stall did not require extra large rudders for the purpose of overcoming the aileron drag. The first control slots were mechanically operated, and thus introduced extra complication. The latest step in the evolution of the slot is, as our readers know, the simplification resulting from making the wing-tip slots automatic in action, i.e., hinging the auxiliary aerofoil on links in such a manner that
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