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Aviation History
1914
1914 - 1127.PDF
NOVEMBER 13, 1914, • ' '•' " •• ••• • ' ••• " - • •• •"•• '• " •" ••'•'! - '" " • '••' •' •' •-•" • ^-^- . A COUPLE OF FINE MODELS BY MESSRS. T. W. K. CLARKE AND CO.-Oo the left, a tractor monoplane! and* on the right, a tall-type twin-propeller monoplane. Aeromodellists Serving with the Colours. A correspondent writes suggesting the compilaiion of a complete list for publication of the above. We think the idea an excellent one, and shall be very pleased to receive names and any further details for publication in due course, Wimbledon and District Model Aero Club. Mr. O. Hamilton, Jun., Hon. Sec. of the Stony Stratford and District Model Aero Club, writes as follows :— " I was intensely surprised to read in the monihly reports of club proceedings the following sentence in the one from the above club: ' Mr. Chown's single pusher canard .... reappeared on the 18th. Several nights were made, including one of 20 sees. ; but it has been decided to abandon this type of model, as it does not give as good result as the tractor type.' " It is, to me, rather a shock to find anyone abandoning a type because of a poor initial result, especially from the type of model enthusiast of the calibre of Mr. Chown's standing, who can obtain ® ® KITE AND MODEL AEROPLANE ASSOCIATION. Official Notices. British Model Records. Single screw, hand-launched Duration T ™*~*. *> g££ Single screw,** off |W*[g£K T ™~~ 'd° teon Single-tractor screw, hand-/Distance . launched \ Duration . •*•.«••— tea: Sing^screw hydro., off-j.Dnration Single-tractor, do., do. ... Duration , Twin screw, do., do. ... Duration . Eneine driven off (trass ... Duration . Official Notices.—A competition for compressed air models will be_ held at Wimbledon Common, on Saturday, the 14th inst. Intending competitors are ® ® CORRESPONDENCE:. Navigating Aircraft—How to Obtain the Speed of an Aeroplane Relative to the Earth, and its Position over the Ground. [1887] In view ol the fact that several articles have recently appeared in FLIGHT on the subject of finding one's way about on an aeroplane and on obtaining the " earth-speed," it may be of interest to you to have a description of two instruments which I have invented and which have been patented in the names of Mr. Arther H. Sippe and myself. The patent specifications are No. 24931, 1911, and No. 1591, 1912. It would perhaps be as well to take the speedometer first. The action of this instrument depends upon the inertia of a sliding weight or disc. In one form of construction a weight is arranged to slide along guides placed in the direction of motion of the machine. This weight is kept in a central position by means of springs placed round the guides on which it runs. It is connected with a small wheel, which itself is mounted on a square shaft in such a manner that the wheel and shaft rotate together, while at the same time the wheel can slide along this square shaft with the movement J. E. Louch K. Lucas T. D. Collingwood Chown W. E. Evans ... J. E. Louch L. H. Slatter ... J. E. Louch C. C. Dutton J. E. Louch C. C. Dutton J. E. Louch L. H. Slatter C. C. Dutton S. C. Hersom ... D. Stanger 95 sees. 590 yards. 145 sees. 290 yards. 68 sees. 365 yards. > mins. 4Q sees 266 yards 91 sees. 190 yards. 94 tecs. 35 sees. 19 sees. 6S sees. Si sees. 145 sees, with a 3 ft. 3 or.s. 1-1-0 P2, to which I say, ' Hats off, gentlemen.' It is an unfortunate statement on the part of the writer of the above report, because facts and deeds must sulstantiiie their possibilities. Firstly, there are the British otiicial records, where Mr. Louch has 9$ sees, to his credit; secondly, the activity of other clubs in this direction; thirdly, we, ourselves, feel to be a little in the running with regular flights ranging from 20 to 60 sees. Our active clubmember, Mr. Mennell, has stated often in our club-room that, given the attention and encouragement the twin has received, it will be on an equal footing with it. M r. Elmcs, another ol our members, is very keen on the type, and he was the introducer of the ' boat-shape fuselagr' to the club in 1911. This type was used by us in our earliest experiments, but the twin came in and swept the t>oard, and concentration on these developed ; but I am thankful to feel that we have returned to our old 'buses again, and also a more varied assortment of types. " In conclusion, I think the decision of the Wimbledon Club calls for the ratification of the record class for this type." ® ® requested lo be ready to start at 2.30 sharp, as it is intended if possible to give each competitor three flights, of which the averate will be taken. PHie Distribution.—Will all who held challenge cups, fct, the previous season forward these to the model secretary, H. A. Lyche, 46, Templesheen Road, East Sheen, S. W., during next week if possible, »J that arrangements can be made to distribute these challenge trophies to the winners of the present season. All communications with reference to models to be addressed to H. A. Lyche, 46, Templesbeen Road, East Sheen, S.W. AFFILIATED MODEL CLUBS DIARY. Club reports of chief work done will be published monthly for the future. Secretaries' reports, to be included, must reach the Editor on the last Monday in each month. Leytonstone and District AeC.( 14.1 .KYTONSTONB RD. .STRATFORD) Nov. 15TH, flying as usual, Wanstead Flats, to o'clock. Club's official records will be taken, duration and distance. Officials: Mr. 11. Ludlow, Mr. L. I-amplugh, Mr. H. C. Bond. UNAFFILIATED CLUBS. S. Eastern Model Ae.C. (154, PECKHAM RYE, S.E.) MUBTINGS this week-end as usual. Owing tu unforeseen circumstances the clubroom arrangements have been postponed. ® ® of the weight. The wheel is in contact with a circular disc, which is driven at a definite speed by clockwork, and normally the wheel lies at the centre of this disc fo that no rotation ensues. When the machine carrying the instrument begins to move, owing to its acceleration, a force acts on the weight proportional to the product of its mass and the acceleration, driving it back along its guides against the action of one of the springs. It will thus be forced back to a point distant from the rest position a length proportional to this force, and, since the mass is constant, this length is propor tional to the acceleration of the vehicle. So long as the acceleration persists, the weight and with it the little sliding wheel will remain in this position. Thus the wheel lies at a point whose distance from the centre of the time disc is proportional to the acceleration, and will be rotated an amount proportional to the product of acceleration and time. Thus a pointer connected to the end of the squared shaft on which the wheel slides will be rotated this amount as well, and may be made to move over a suitable graduated scale. When the vehicle is no longer accelerated, the spring will bring the weight back to its central position, the time disc will no longer rotate, the wheel and the pointer attached to its shaft will remain stationary. Its position measures the velocity the vehicle has attained. If the vehicle is retarded, the weight and wheel experience a force in the 1127
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