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Aviation History
1912
1912 - 1096.PDF
l/tlGHT •. the velocity All momentums, velocities, &c, are relative to the ground. The momentum of the aeroplane before the turn — AV " " air " =°1„, ,, ,, aeroplane after the turn — - AV1 ,. air „ =AV-AV> ' au " M(V-V')(i) Also the K.E. lost to the aeroplane ss J A (V* - V12) and the K.E. gained by the air = J M j ^-(V - V1) |" M(V-V') = A(V + V1) (ii) Now I am going to show that if the aeroplane in a wind of any velocity (v) behaves exactly relatively to the air as it does in a. calm, then the energy given to the air (considered relatively to the ground) is equal to tho energy lost by the aeroplane (considered relatively to the ground). So shall my theory be satisfied. The velocity of the wind is v, and the aeroplane makes a 16 point turn from down wind and up wind. The velocity of the aeroplane down wind is (V + v). „ „ up „ - V + v). The velocity given to the mass M, relatively to the ground = v + £-<V + VI>- M As in a calm, the sum of the momenta before and after the turn of the aeroplane and mass, M, are the same. And also :— The K.E. of the aeroplane down wind = -J A (V + v)2 up „ = JA(-V» + wV* ,, mass M before turn = i M v2 „ mass M after turn =JM j v+ »|(V + V1) | It can be shown that the K. E. lost by the aeroplane is equal to that gained by the mass M (using equation II), but that proof I will spare you. I think I have done enough to show that by con sidering the displaced mass of air, M, a theory can be evolved that satisfies equations of K.E. on momentum whether these be con sidered relative to the ground or air, although, perhaps, I have established no absolute proof. I also put it to you that in Newton's laws of motion, " motion " is always relative to sun, moon or stars, or anything. Finally, if you still adhere to your theory, I ask you to work out the fall of a 60 m.p.h. aeroplane in feet when turning in a 30 m.p.h. wind from up wind to down wind. Harwich. JASKO Red Lights for Night-flying. [1674] Referring to the Night-flying Exhibition at Hendon last Saturday week and the unfortunate accident to Mr. Gates, may I suggest that the latter incident might possibly have been prevented by a few red lamps placed on the fence marking the boundary of the aerodrome, and also on dangerous objects, such as trees, just without the boundary. The pilot might then be able to guide his machine clear of such objects or keep within the flying ground. Finchley, November 13th. ARTHUR T. DOEG. Balloon Records (1668 and 1669). [1675] Your correspondent apparently quotes me as saying that Glaisher and Coxwell's balloon "reached an elevation of (about) 37>0ooft., or fully seven miles.'' If anyone will refer to my book, " Aerial Navigation of To-day," he will see that the paragraph in question is quoted from Glaisher's " Travels in the Air." I particularly pointed out that Glaisher's instruments were not so reliable as those in use by balloonists of the present day. At the same time, although Sliring and Berson undoubtedly hold the record, I entirely dissent from the view that Glaisher and Coxwell went no higher than 31,000 ft. The matter is not important, how ever, for the exact height being unknown, it cannot count in official records. [Those interested ought to read Glaisher's complete account.] November 16th. CHARLES C. TURNER. [1676] Your correspondent, Mr. C. A. K. Cox (letter 1657), will find a full account of Messrs. Coxwell and Glaisher's balloon ascents in the year 1862 in Irving's Annals of Our Time, page 628, and also in the Chronicles of the Annual Register of 1862, page 144, under date July 17th. In the latter book there is a long account of the several ascents they made ; the greatest height which they were able to record was 35,000 ft., but the balloon may have gone higher. Aylesbury. HUBERT BEAUMONT. NOVEMBER 23, 1912. Another Irish Monoplane Tested. HAVING completed the monoplane which he has built himself at Coolnamuck, Clonmel, M. Jurgens spent some time last week testing the engine, and on Friday evening made his first flight. Rising easily, the machine is reported to have flown at a good height for several hundred yards, and then landed in splendid style. Arrangements have been made for M. Jurgens to give exhibitions at Clonmel. A Record with Continental Fabric. THE record flight made by Von Gorrison the other day, at Johannisthal, with five passengers, speaks well for the "Continental" aeroplane sheeting with which his A.G.O. biplane was covered. Integral Propellers in Africa. WRITING to the Integral Propeller Co., whom he now repre sents in South Africa, Mr. C. Compton Paterson says :—" I might mention that my 500-mile flight across Central South Africa was successfully completed without mishap of any kind on a Paterson biplane, fitted with the original Chauviere propeller I have used throughout my tour, which has comprised visits to Capetown, Kimberley, Johannesburg, Durban, and miny other smaller up- country towns. This propeller is standing up to its work in spite of its constant exposure to broiling sun, and very often heavy rains." Clothing for Flyers. WE learn from Aeronautical Accessories, of 39, St. James' Street, S.W., that they are now in a position to undertake the out fitting of aviators literally from head to foot, and moreover to the complete satisfaction of their clients. It is well known that they are sole selling agents for the Warren Patent Safety Helmet and also that they are turning out an exceedingly useful leather overall lined with fleece throughout, while a similarly lined and very comfortable soft leather top boot is a speciality. Among other aerial necessities that we understand they are stocking are rainproof gauntlets, ordinary gauntlets, sweaters with double-knitted chest, mufflers, rubber top boots, &c. They also have some special goggles made of clear, unbreakable, uncrackable, non-inflammable material, made in two forms, one specially to clip on the Warren helmet, and the other to be worn in the ordinary way without helmet. ® ® ® ® PUBLICATION RECEIVED. Les Aeronefs sans Chutes. By M. Remade. Paris : F. Louis Vivien, 48, rue des Ecoles. Price I fr. Catalogue. Wakefield Castrol. C. C. Wakefield and Co., 27, Cannon Street, E.C. ® ® ® ® NEW COMPANY REGISTERED. Hart Aeroplanes and Waterplanes, Ltd., 6, Holbom Viaduct, E.C.—Capital ^8,000, divided into 8,000 ordinary shares of £1 each. Directors, Alfred Waters, Howard T. Wright, and H. De Grey Warter. ® ® ® ® Aeronautical Patents Published. Applied for In 1811. Published November vtst, 1912. 17,130. P. JERRARD. Flying machines, airships, &c. 01,417. O. BRA.UK. Flying machine. 2 3J585' -H- HASSENEACH. Controlling apparatus for wings of aerial machines. 2 4>°33- J- V. JANIN. Airships. 25,190. J.ANDERSON. Feathering wind sails or propellers. Applied for In 1813. Published November 21st, 1012. 13,104. F. W. STODDEK. Flying machines. 22,627. J- "^• JANIN- Airships. FLIGHT. 44, ST. MARTIN'S LANE, LONDON, W.C. Telegraphic address : Truditur, London. Telephone : 1828 Gerrard. SUBSCRIPTION RATES. FLIGHT will be forwarded, post free, at the following rates:— UNITED KINGDOM. ABROAD. s. d. 3 Months, Post Free... 3 9 6 1, 7 6 12 „ „ ..._ 15 0 s. 3 Months, Post Free... 5 6 „ „ ... 10 12 „ „ ... 20 d. 0 0 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 accepted. IO96
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