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Aviation History
1909
1909 - 0163.PDF
MARCH 20, 1909. AERO CLUB OF THE UNITED KINGDOM. OFFICIAL NOTICES TO MEMBERS. Aero Exhibition at Olympia. I The Aero Exhibition at Olympia, held under the auspices of the Aero Club of the United Kingdom, opened yesterday and terminates on the 27th inst. Members of the Aero Club are admitted free on production of their Aero Club membership cards. The Princess Rooms are placed at the disposal of the members during the Exhibition. During the Exhibition, the offices of the Aero Club will be at the Princess Rooms, Olympia (Telephone, 3632 Kensington). Wright Aeroplanes. In connection with various offers to provide Wright aeroplanes for flying in England, the Aero Club have received a communication from Messrs. Wright Bros., asking the Club to point out to intending purchasers the importance of seeing that the ownership of the Wright aeroplane carries with it full rights of user in England. The Aero Club will be pleased to answer any enquiries. Gordon-Bennett Balloon Race. The Aero Club have entered one balloon to compete in the Gordon-Bennett Balloon Race which takes place at Zurich in September or October next. The Club will be represented by Mr. Frank McClean and Mr. Griffith Brewer. New Members. The following new members have been elected :— William Frederick Adams. T. H. M. Greenly. W. R. Cooper. Julian A. Halford. Major Palmer Dalton. R. P. Hearne. Comdr. O. H. Davies, R.N. Charles A. P. Howes. Capt. H. H. P. Deasy. John P. Koch. Rev. Edward Foord-Kelcey. E. J. Mazzuchi. In order that a complete record may be kept of flying machines in this country, the Committee of the Aero- Club will be glad to hear as soon as possible from those members who are building or purchasing machines. Full dimensions should be given. Membership. The membership of the Aero Club is rapidly increasing, over one hundred new members having been elected during the last two months. HAROLD E. PERRIN, Secretary. The Aero Club of the United Kingdom, 166, Piccadilly, W. CORRESPONDENCE. *,* The name, and address of the writer not necessarily for publication) MUST in all cases accompany letters intended for insertion, or containing queries. PROPELLERS AND MOTORS. To the Editor of FLIGHT. SIR,—Re Mr. Hollands' letter in FLIGHT, March 13th. I did not attack Mr. Hollands on the Hollands propeller, and if your readers go back to the original correspondence from me they will find no mention of any particular propeller or person but a letter advising experimenters to make greater efforts to place them- selves in an independent position, and be able to understand and make propellers for themselves. If the correspondence be sifted carefully 1 think it will be found that Mr. Hollands attacked me with a letter full of irony and " levity " which I was unwilling to pass by. I am pleased to know that the " Hollands" has such great efficiency in a static state, but I do not agree that it is the same on a moving body—on a moving body the 'thrust only approximates in efficiency to the thrust on a static body—in very large propellers, the difference getting larger as the size of the propeller decreases. Yours very truly, .--....••;:.. . _. MONTFORD KAY. FLYING MACHINE CRITICISM. To the Editor of FLIGHT. SIR,—In your issue of February 13th there appears a letter from Mr. E. Wilson, in which he indulges in some very scathing remarks on the aeroplane, or, to give it a better name, the aerofoil. What- ever may be the present defects and shortcomings of these machines, they at least have the credit of placing aeronautics as a practical science on a substantial basis, and it is to be hoped that their continued success will do something to eliminate the "crank " from aeronautics. To those who have studied the problem with insight, there is no question that these machines are built on sound scientific principles, and it will be an interesting study to watch their future development in Great Britain, and their management by those who understand them and those who do not. These early attacks on a practical and successful machine, and the bolstering up of a theoretical monstrosity, ought not to go unanswered. One could take Mr. Wilson more seriously if he would condescend to give details of the machine he advocates, such as horse power, weight, &c. It is quite time flying machine inventors got down to solid facts. The problem is governed by hard and fast laws, just the same as any other science. The time for dreaming is past. . • There are generally several ways of approaching a problem, but Mr. Wilson should withhold such trenchant criticism until he has done at least as much as Messrs. Wright. > Yours faithfully, Streatham. E. C. DWYKR. A MODEL ENGINE DESIGN. : .; li To the Editor of FLIGHT. SIR,—In reply to Mr. Potter's letter in FLIGHT, March 13th. Sixteen years ago the petrol motor was practically non-existent, and, consequent on the development of the petrol motor, the steam engine has been improved to keep in a competitive position in the mercantile world. Sixteen years ago every engine was slow moving, now every engine is fast moving, because vibration has been reduced to a minimum, and extreme improvements have been made in metals. High rates of piston speed have entirely displaced low piston speed. With low piston speed the engine requires to be larger and heavier than is the case with a light engine having high piston speed to produce the same power. The same holds good with regard to weight, low piston speed, and increased steam pressure to produce the same power as a light engine with high piston speed and low pressure. It is no uncommon thing now to find an installation driven by steam engines with a speed of 700 to 850 revs, per min., and which cannot be heard running a few yards away, a thing impossible to find until recent years. The enclosed balanced type of engine has made this possible. I do not think badly of Mr. Potter's engine, but I do think that it cannot be quite so good as the engines in genera! use, owing to mechanical limitations consequent in the design, and when dealing with aeroplanes the greatest efficiency is desirable in h.p. weight of engine. Yours very truly, MONTFORD KAY. WRIGHT AEROPLANES. To the Editor of FLIGHT. SIR,—In connection with various offers to provide Wright aero- planes for flying in England, my Committee are requested by Messrs. Wright Bros, to point out to intending purchasers the im- portance of seeing that the ownership of the aeroplane carries with it full rights of user in England. Yours faithfully, AERO CLUB OF THE UNITED KINGDOM, HAROLD E. PERRIN, Secretary. 165
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