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Aviation History
1926
1926 - 0540.PDF
JULY 29, 1926 CORRESPONDENCE SPEED AND USEFUL LOAD [2141] Mr. Stephan in your issue of July 1, moves [2137] that our difference of opinion with regard to speed and useful load is due to our looking at the question from different angles. I dissent entirely from this view. We are both endeavouring to justify what we consider in all circumstances to be the fairest and most useful expression to signify the comparative commercial efficiency of an aircraft to an operating company. I take my stand by my letter in your issue of April 8, 1926, and, in amplification of this, by the tables on page 181 and the explanations on page 182 of your issue of March 25 Mr. Stephan is quite wrong in thinking I want to introduce a speed term and if he will refer to your issue of June 10 he will read " If, however, a figure of merit for speed is desired surely the coefficient, total load carried per horse-power top speed is the proper one to use." With regard to the comparative figures in your leader June 10, for the " Hampstead " and the D.H.66, the whole basis of my efficiency figure is that a constant range must be taken, and all fuel and oil normally carried above the amount requisite for this range must be credited to paying load. As previously stated, this is what has been done in the tables. I would repeat what I wrote in your issue of April 8. " It will be a long while before speed will rank equally with load carried per horse-power." For commercial machines I think this is now generally accepted, which is merely another way of saymg that no justification can be found for taking the direct product speed X load carried per horse-power as an indication of comparative efficiency. It is the flimsiest argument that because a minimum speed is necessary, speed must be introduced into an operational efficiency co-efficient on terms co-equal with load carried. The last thing I desire to do is to gain my point on account of Mr. Stephan's lingual handicap, but I think he fairly sums up the Fokker co-efficient when he refers to it as " our propaganda formula." Southampton, O. E. SIMMONDS. July 12, 1926. CHECKING KING'S CUP ENGINES [2142] I read with great interest the report of the King's Cup Race, but there is a point that has struck me as very curious. I cannot find that the Royal Aerd Club actually check the engines which are used in a race of this sort, particularly after the event, to see whether the winning engine has conformed with its entry. I also find that during the intervals the aeroplanes were in the controls at Hendon they could not only have their engines cleaned of carbon deposit, but, if necessary, even new parts fitted. It seems to me vital in events of this sort that one should know everything that is done, just in the way motor-car events of a reliability character are checked. The results may easily be misleading under the present method of dealing with the regulations. Thames'Ditton. S. F. EDGE July 21, 1926. IMPORTS AND EXPORTS, 1925-1926 AEROPLANES, airships, balloons and parts thereof (not shown separately before 1910). For 1910 and 1911 figures see "FLIGHT" for January 25, 1912; for 1912 and 1913. see " FLIGHT " for January 17, 1914 ; for 1914, see " FLIGHT " for January 15,1915 ; for 1915, see " FLIGHT " for January 13, 1916; for 1916, see "FLIGHT" for January 11, 1917;' for 1917, see " FLIGHT " for January 24, 1918 ; for 1918, see " FLIGHT " for January 16, 1919 ; for 1919, see " FLIGHT " for January 22,1920 ; for 1920, see " FLIGHT " for January 13, 1921 ; for 1921, see " FLIGHT " for January 19, 1922 ; for 1922 see " FLIGHT " for January 18, 1923 ; for 1923, see " FLIGHT "for January 17, 1924 ; "for 1924, see " FLIGHT " for January 22, 1925; for 1925, see "FLIGHT" for January 21, 1926. Imports. Exports. Re-Exports. 1925. 1926. 1925. 1926. 1925. 1926. •:' i i £ £ £ £ Jan. ..3,546 494 83,728 130,049 291 — Feb. .. 985 2,089 85,639 40,416 20 6,341 Mas.., — 1,001 56,881 92,840 9,355 9,758 lA&L •.. 321 536 78,041 160,832 6,732 5,051 May .. 560 342 74,844 118,539 15,278 — June.. 190 24,866 71,009 6^,111 667 150 SOCIETY OF MODEL AERONAUTICAL ENGINEERS ON Saturday, July 10, the Society sent a team of four members to the R. A.F. station at Halton Camp to take part in the mode' flying display given by the Halton Model Aero Club. A very successful meeting took place, in which also a third club (namely, that of Cranwell) was represented. Weather con- ditions were good, and the flying was excellent, so much so in fact, that two British model records were broken. These were accomplished by W. J. Plater (of the S.M.A.E. & Cran- well Club), who raised the figures for fuselage tractor models to :— 50 sees, duration . . hand-launched and 45;; ,, ,, . . rising off ground. (It is hoped to give a description with drawings of this model in FLIGHT m due course.) On July 17, two further records were established :— 1. Autogiro model, D. A. Pavely, 22 sees, duration— 430 ft. distance. 2. Fuselage seaplane, S. C. Hersom, 10 sees, (rising oft water). The first of these resulted from the " FLIGHT " Cup com- petition, held on the above date, which was won by Mr. Pavely. other competitors experiencing considerable difficulty with this type of model. The next flying meeting will be held at the Sudbury ground on Saturday, August 7, at 3 p.m., being a general record day. B. K. JOHNSON, ( Hon. Secretary). PUBLICATIONS RECEIVED The Accessory. Vol. 12, No. 128. July, 1926. Brown Brothers, Ltd., Great Eastern Street, London, E.C. 2. Meteorological Office : Professional Noles No. 44. The Yelocitv Equivalents of the Beaufort Scale. By G. C. Simpson, C.B.E.' D.Sc, F.R.S. H.M Stationery Office, Kingsway, London, W.C.2. Price 9rf. net. Research Department, Woolwich. R.D. Report. No. 63. Part I.—Description and Discussion of the Air Disturbance Round Bullets in Free Flight. 1925. H.M. Stationery Office, Kingsway, London, W.C.2. Price 4s. net. Catalogues Stewart Speedometers and Motor Accessories. The Cooper- Stewart Engineering Co., Ltd., 136-7, Long Acre, London, W.C. 2. " Perfect Seal " Piston Ring. Henderson Brothers, 77, Windsor House, Victoria Street, Westminster, S.W. 1. AERONAUTICAL PATENT SPECIFICATIONS A bbreviations : Cyl. -= cylinder; i.e. — internal combustion : m. •» motor. The numbers in brackets are those under which the Specifications willbe printed and abridged, etc. APPLIED FOR IN 1925 Published July 29, 1926. 8,509. M. L. BRAMSON. Variable-pitch propellers. (254,377.)8,677. D. K. SHAW. Rotary engine. (254,384.) 15,747. G. G. PARNALL and H. BOLAS. Cooling-arrangements for cylindersof i.e. engines. (254,495.) FLIGHT The Aircraft Engineer and Airships 36, GREAT QUEEN STREET, KINGSWAY, W.C.2. Telegraphic address: Truditur, Westcent, London. Telephone : Gerrard 1828. 5,602 29,328 450,142 608,787 32,343 21,300 SUBSCRIPTION RATES " FLIGHT" will be forwarded, post free, at the following rates'.— UNITED KINGDOM ABROAD* s. d. s. d. 3 Months, Post Free.. 7 7 3 Months, Post Free .. 8 3 6 15 2 6 16 6 12 „ „ ..30 4 | 12 „ „ ..33 0 * Foreign subscriptions must be remitted in British atrrencv. Cheques and Post Office Orders should be made payable to the Proprietors of " FLIGHT," 36, Great Queen Street, Kingsway, W.C.2, and crossed Westminster Bank. 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. HZ1".
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