FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1912
1912 - 0298.PDF
\fijm MARCH 30, 1912. in this case the elevator was in front of the main-plane. This machine (somewhat modified) showed its flying qualities at the end of 1907, when towed with a heavy motor cycle engine and Mr. A. V. Roe aboard. Once off the ground it could be towed with one finger, and on letting the line go the machine glided perfectly. In June, 1008, it made a first short flight, the first in England, driven by a 24-h.p. Antoinette engine. However, in his next machine— which was a triplane—he kept the square stream-line body and the positions of aviator and engine, but the tail was behind, and the main-planes were under complete control, that is, they could be warped or used as elevators. The first machine of this type was built in 1908 for a 35-h.p. engine, but owing to the non-delivery of the motor nothing further was done with it. Afterwards a small machine with a triangular body, for a 9-h.p. Jap engine was constructed. This made its first flight in June, 1909. Goupy III biplane made its first flight 14th December, 1909. I have no informa tion as to any flights made by Goupy II, but believe it was given up as it was rather a heavy machine with only a 25-h.p. engine. H. V. ROE. Longitudinal Stability. [1521] I was, I fear, not sufficiently explicit in my letter 1496 as to why I took 0 = oin the formula for finding the value of S1/S3 when //* is a minimum. My reason was that the normal attitude of an aeroplane in flight is usually taken to be tangential to its path, and if " stiffness," using the naval analogy, be desired, we want the displacement of the c.p. to be a maximum per degree of tilt in that position, that is, with 0 = 0. The problem Mr. Atkinson con templates seems to correspond rather to that of a vessel sailing heeled over by wind on the side than to one concerning aeroplanes ; to my mind, adhering as I do to avoiding inferences as to stability other than statical, while equations incapable of dealing with the dynamical questions of oscillations are concerned. Either Mr. Atkinson, or the demon above referred to, makes a mistake in quoting as the examples I took sin a = TV, sin /3 = £, for, on looking at my letter, 1496, I find I rightly took sin a= J, sin 0 = il5> the difference being important, because sin o belongs to the leading plane, and its angle of attack must be the larger of the two, otherwise the c.p. would move the wrong way, rendering the machine inherently unstable, so that, as 1510 stands, the calculations appear to apply to an inherently unstable machine. With regard to the radius of gyrations of the mass of the aeroplane, it comes into account, of course, as Mr. Atkinson says, but in referring to the naval analogy, I was thinking of the effect of form of cross-section of a ship, not of distribution of weight of hull and cargo, in influencing rolling. The moment of inertia enters into account, be it observed, because the question of stability essentially involves the effects of inertia and damping, which unavoidably entail heavier mathematics than statical questions do. Inferences from the conclusions of statical, applied to dynamical mechanics, are liable to turn out just as unpractical as was the endeavour to force signals in rapid suc cession through the Atlantic cable of 1858 by high battery power, which ruined the cable within a month. Monkstown, co. Dublin. MAURICE F. FITZGERALD. ® ® ® ® AIRSBHIP NEWS. "Capitaine Ferber" Visits Issy. WITH six persons on board, the Zodiac military dirigible " Capitaine Ferber " cruised over from St. Cyr to Issy on the 20th. It also visited Issy on the following day, and made some trips there for instructional purposes. Two more Dirigibles for Germany. IT is reported from Berlin that the German War Office has ordered two more dirigibles to be delivered in May. One is a Zeppelin, 140 metres in length, and the other a Parseval, the envelope of which will be 80 metres long and 14 metres in diameter. A Mishap with " Parseval III." WHILE landing after manoeuvring over the targets at Tegel, the " Farseval III " was caught by a gust of wind and four soldiers who were holding the ropes, were carried into the air. One of them fell from a height of 8 metres and was serious hurt. It was only after a great_ deal of trouble that Captain von Jena succeeded in bringing the airship to anchor, "With the Dirigibles at Tripoli. IT appears that the first tests with the airships at Tripoli were made on March 10th, when " P 2 " and " P 3 " cruised in company for about two hours and a half, and dropped some thirty bombs. The success of their bomb-dropping exploits is not at all sure, as, although the Italians claimed that they did great damage, an English correspondent with the Turkish Army says there was no panic, while the few fatalities seemed to have occurred to non-combatants. "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, 202;. 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. PUBLICATION RECEIVED. Catalogue. BUriot-Typc Monoplanes. The American Aeroplane Supply House, Hempstead, New York, U.S.A. ® ® ® ® NEW COMPANIES REGISTERED. Perfecto Aero Propellers Co., Ltd., Salisbury House, London Wall, E.C.—Capital ,£3,000, in £1 shares. Scottish Aviation Co., Ltd., 65, Bath Street, Glasgow.— Capital ;£ 10,000, in $s. shares. Formed to manufacture, buy, sell, and repair aeroplanes, airships, aerobuses, &c, and to carry on training and teaching schools and aerodromes. ® ® 5,180. 6,520. 12.375. 12,805. Aeronautical Patents Published. Applied ror In 1911. Published March 2%tk, 1912. P. JOSEPH. Aeroplanes. J. LEGRAND. Aeroplanes carrying fire-arms. J. F. BENTON, Spring system for supporting flying-machines. J. F. BENTON. Collapsible spring skids. EASTER HOLIDAYS. In consequence of the holidays FLIGHT will be published on Thursday next week. All matter, editorial and advertisement, must therefore be received not later than first post Tuesday. PRINCIPAL CONTENTS. Editorial Comment Military Progress in France. Mr. Grahame-White and the Authorities. The Royal Aero Club. The New Avro Biplane (with scale drawings) Monoplane Failures Royal Aero Club Notes ... Air Eddies. By " Oiseau Bleu " A Three Days'Meeting at Hendon From the British Flying Grounds Foreign Aviation News A i-h.p. Petrol Motor for Model Aeroplanes. By George Brent. Models. Conducted by V. E. Johnson, M.A. Progress of Flight about the Country Aviation in India Correspondence Airship News 285 287 288 2S9 291 293 294 297 297 29S FLIGHT. 44. ST. MARTIN'S LANE, LONDON, W.C. Telegraphic address: Truditur, London. Telephone: 1828 Gerrard. SUBSCRIPTION RATES. FLIGHT will be forwarded, post free, to any tart of the world at the following rates:— UNITED KINGDOM. ABROAD. 3 Months, Post Free .. 6 » » 12 „ s. d. . 1 8 • 3 3 . 6 6 3 Months, Post Free... 6 >. » 12 „ s. d. 2 9 S 6 11 0 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 accented. 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. 298
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
