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Aviation History
1912
1912 - 0048.PDF
the resultant reaction, R, (Fig. 2) will be nearer the outer wing. W and R will rotate the aeroplane till W and the vertical component of R are in a line. The horizontal component of R must be equal, and opposite to the centrifugal force (Fig. 3) caused by the circular motion of the © *^ R w (D •n w HKF.ITH GIBSOM aeroplane. If there were no banking there would be no component of R to counteract the centrifugal force, and the aeroplane would tend to slide along in a straight line. It will be noticed that R in turning a corner must be greater than R for going in a straight line. Also it is evident that the horizontal forces form a couple tending to " bank " the machine still more. If the horizontal component of R is less than the centrifugal force the machine will slide outwards, and the planes, acting as a single plane of aspect ratio, I or so, will lift more on the outside. Probably when an aeroplane is tilted the difference in lift of the two planes is not so great as might be expected, owing to the fact that although the outer is going faster there will be a large loss due to air spewing out at the end of the wing (Fig. 4). If the rudder is mounted centrally at the tail of the fuselage, there is no force to start the " banking." Of course, if there is a dihedral angle the sliding of the aeroplane to the outside of the curve, in an endeavour to go in a straight line, would start " banking." But if banking is not wanted why not fit a tail rudder which projected above the fuselage ? This, in conjuction with an enclosed fuselage, should produce a couple, tending to keep down banking. Perhaps some aviator will come forward and say whether a machine banks itself, and if so, whether too much or not enough. Eskbank. A. KEITH GIBSON. A New Firm. ® ® ® ® MESSRS. MANN AND GRIMMER inform us that they have now taken over their model business from Messrs. Willis Brothers and have acquired premises and plant at 15, Arlington Road, Surbiton, so that every individual model may be made and tested under their personal supervision. They are also able, by an arrangement with a well known firm, to do business in almost any branch of full size work, a special feature being passenger flights and demonstrations.' It is hoped to construct a full-sized Mann monoplane in the near future and the firm is making a speciality of building scale models for inventors. Incidentally they mention that the Committee of the Brighton Aero Club have now officially recognised the flight made a little time back by Mr. H. W. Willis with a Mann monoplane as 100 seconds. The firm are also organising an Agency scheme as well as a prize competition, particulars, of which will be found in our advertisement columns. Sketch of the useful and artistic aluminium fruit dish which formed the practical New Yeir's card from Mr. Robert W. Coan. Apart from its utility, the dish is a very fine example of clean casting in this light metal, in which Mr. Coan specialises with such conspicuous success. "FLIGHT" ART PAPER EDITION. IN response^to numerous requests, the publishers of FLIGHT have arranged to print a limited number of copies each week upon art paper, thereby :enabling the high quality of the illustrations and matter to be fully appreciated. These can only be supplied by subscription, the annual charge, post free, being : United Kingdom, 151. ; Abroad, 20s. Present subscribers can secure these copies by paying the difference pro rata of their unexpired subscriptions. Application should be made to the PUBLISHER, 44, ST. MARTIN'S LANE, W.C. IMPORTS AND EXPORTS, AEROPLANES, airships, balloons and parts separately before 1910):— Imports. Exports. 1910. 1911. 1910. 1911. £ £ £ £ January... 2,516 1,196 750 1,088 February 437 3,129 8,950 1,786 March ... 7,516 11,327 128 1,027 April ... 6,305 2,110 950 807 May ... 846 1,707 400 2,471 June ... 7,961 3,225 642 2,432 July ... n,6o8 9,822 336 2,256 August... 6,188 2,873 8l2 2.153 September 1,034 1,839 4.34° 1,183 4,727 670 701 1,785 251 1,440 690 3,257 1,129 1910-11. thereof (not shown Re-Exportation. 1910. 1911. £ £ 550 Nil October 2,816 November 3,941 December 5,038 600 1,47(5 35°, 830 i,4S5 1,668 2,211 i,655 850 357 4.343 1,972 1,682 643 265 400 360 56,206 44,430 15,486 18,473 ® ® ® ® PUBLICATIONS RECEIVED. Maschinenflug. By Jos. Hofmann. Frankfort 12,197 10,022 F. B. Der Auffarth. Price 6 marks. The Helicopter Flying Machine. By A. Robertson Porter, A.M.I.C.E. London: Offices of Aeronautics, 3, London Wall Buildings, E.C. Price 3s. 6d. net. ® ® ® ® Aeronautical Patents Published. Applied for lu IBIO. Publislied January zitk, 1912. A. E., H. L., AND H. O. SHORT. Atmospheric pressure indicator. N. DE BENOIS. Flying machines. Applied lor In 1011. Published J anuary ittn, 1912. SIR W. E. J. VAVASOUR. Aerial machines. 29,874. 30,139. 8,398- PAGE ... 26 ••7 PRINCIPAL CONTENTS. * Editorial Comment Aviation Services. Enterprise at Hendon Paris Aero Show An Aeroplane Study. By Mervyn O'Gorman "Ergaer" From the British Flying Grounds Royal Aero Club Notes Air Eddies. By " Oiseau Bleu " Foreign Aviation News British Patents Fieux CO-Motors for Aviation Models Models. Conducted by V. E. Johnson, M.A Progress of Flight about the Country Correspondence ... Imports and Exports, 1910-11 -v;, 34 36 38 39 40 4-' 43 44 45 47 48 FLIGHT. 44, ST. MARTIN'S LANE, LONDON, W.C. Telegraphic address: Truditur, London. Telephone: 1828 Gerrard. SU BSCRIPTION RATES. FLIGHT will be forwarded, post free, to any part of the world at the following rates:— UNITED KINGDOM. ABROAD. s. d. 3 Months, Post Free.. 6 • ,, s. 2 5 11 3 Months, Post Free ... 1 8 6 „ „ ... 3 3 12 „ „ ... 6 6 Cheques and Post Office Orders should be made payable to the Proprietors of FLIGHT, 44, St. Martin's Lane, W.C., and crossed London County and Westminster Bank, otherwise no responsibility will be accepted. Should any difficulty be experienced in procuring FLIGHT from local newsvendors, intending readers can obtain each issue direct from the Publishing Office, by forwarding remittance as above. 48
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