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Aviation History
1921
1921 - 0117.PDF
FEBRUARY 17, 1021 ROYAL AERONAUTICAL SOCIETY NOTICES Meetings.—Sir Joseph Petavel, M.B.E., will preside at Mr. Handley Page's lecture on "The Handley Page Wing," which is to commence at 5.30 p.m. on Thursday, February 17, in the Theatre of the Royal Society of Arts, John Street, Adelphi. The following meeting will take place on Thursday, March 3, commencing at 5 p.m., when two papers will be read : " Airship Fabrics," by Mr. J. W. W. Dyer, and ."Parachutes," by Maj. Orde Lees, O.B.E., A.F.C. Air- Commodore E. M, Maitland, C.M.G., D.S.O., A.F.C., will be in the chair. Olympia Efficiency Exhibition,—At the request of the Higher Production Council it has been arranged for Mr. White Smith to read a paper on " Commercial Aeroplane and Seaplane Transport," in the lecture hall at Olympia at 11 a.m. on Friday, February 25, to be followed by a similar paper'oh "Commercial Airship Transport," by Mr. C. I. R. Campbell, O.B.E., M.I.M.A. Maj. Sir John Baird, Bart., CMC, D.S.O., M.P., will take the chair. Manchester Society of Engineers.—At the request of the Manchester SoGiety of Engineers it has been arranged for the chairman (Air-Commodore H. R. M. Brooke-Popham, C.B., C.M.G., D.S.O., A.F.C.) to read a paper on "Some Problems in the Design and Operation of Aircraft," before the members of that body at 7 p.m. on Wednesday evening, March 2. Donation.—The Council desire gratefully to acknowledge the receipt from Mr. Alma Baker, Honorary Member, of a presentation copy of his " Souvenir of the Australian and Malaya Battleplanes, 1914-1918," which has been prepared as a record of the efforts made to assist the Home Government during the War by presenting aeroplanes to the Royal Flying Corps and Royal Air Force, as a result of which sufficient money was subscribed to purchase 94 aeroplanes. Journal.—Copies of the following numbers of the " Journal " are urgently required, and the Secretary would be grateful if any member who does not desire to retain his copies for filing purposes would be kind enough to return them, as these numbers are quite out of print: January, March, April and June, 1920. W. LOCKWOOD MARSH, Secretary A NEW AMERICAN HIGH-LIFT The Glenn Martin No. 2 WING WE have received from the Glenn Martin Company the accompanying dimensioned section of a new wing recently tested by them. In the covering letter some rather bold claims are made for this wing, such as " the highest-lift wing in the world," etc. It is mentioned, however, that a model 18 ins. by 3 ins. lifted, in the wind tunnel, a load of 4| lbs. per sq. ft. at 30 m.p.h. In working out the lift for any wing except the Parker Variable Camber aerofoil. This does not tell one very much, except that the best L/D of the Parker variable section, when tested as a stream line section, was 16.84, an<i that apparently no claim is made by the Glenn Martin Company to have improved upon this figure. In the absence of complete data, one can only say that the Glenn Martin wing section No. 2 is a high-lift THE NEW GLENN MARTIN HIGH-LIFT WING No. 2 : The ordinates given are percentage of the chord coefficient corresponding to this lift and speed, one arrives at a maximum lift coefficient of 1.016 (absolute), which, although very good, is certainly not the highest lift attained. The Handley Page wing, for instance, gives greater lift than that. Among other claims made for the new Glenn Martin wing is that at high speeds it is from 10 to 15 per cent, more efficient than the highest value ever recorded wing with a maximum KL of about 1, and a maximum L/D of in the neighbourhood of 16. This is certainly quite good, but nothing to get wildly excited about. The wing should be quite a useful one, having plenty of room for deep spars, and should be suitable for machines in which a minimum of external bracing is desired. It is scarcely deep enough for a cantilever wing to be economically built. The Coupe Michelin for Aircraft IN response to a query raised by the Aero Club of Italy, the A6.C. de France announces that the competition is open equally for waterplanes. These in their class will be entitled to compete in any of the countries in the Federation. Each country has therefore to arrange for both land and water machines to compete over their respective elements over a 3,000 kilometre course, with a minimum number of fifteen alightings, the essence of this "commercial" machine contest being the best speed over the 3,000 kilometres. Two Air Events for Brescia IN September next, when the big Brescia automobile meeting takes place, two flying events have been arranged to take place simultaneously with the motor racing. The first will be the Grand Prix d'Aviation, which will be run at the same time as the Grand Prix d'ltalie for motors, the course in each case being the same, over a circuit of 18 kilometres at Montichiari. A second aviation race for touring aeroplanes only will take place simultaneously with the voiturette racing class event, in each case the dual events having, of course, no relationship to each other. Cambridge University Aeronautical Society IN amplification of his lecture on " Parachutes " t)efore the Cambridge University Aeronautical Society on January 19, Maj. T. Orde Lees, O.B.E., A.F.C., gave a demonstration of the " Guardian Angel " parachute on the Society's landing- ground at Girton on Thursday, February 10. Before about 300 members and friends who inspected the attachments of the parachute, and some 5,000 spectators, two jumps were made fromaDe. H.a piloted by Mr. F. J. Ortweiler, M.C. First, Maj. Orde Lees made a descent from a height of 900 ft., and after another parachute had been fitted to the machine, Mr. G. I. Taylor, M.A., F.R.S., of Trinity College, an honorary member of the Society, made a descent from 1,000 ft. Although Mr. Taylor has himself designed a parachute which gives great promise, this was the first time he had essayed an actual descent. 1 117
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