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Aviation History
1916
1916 - 1023.PDF
NOVEMBER 16, 1916. Austin did not supply us with drawings, and so, in order to get a clear idea of the principle of the pro pellers, it was necessary to find the angles and sections by placing the propellers on a table, the angles being measured and the projected blade widths found, while the sections were obtained by making templates in plasticine at various radii from the boss. With regard to the sections the drawings show with f/UGMT to say until results of model tests are available, but ft fair idea may, perhaps, be formed by comparing them with Aile No. 56 tested at the Eiffel Laboratory. This section, which was tested for the Deperdussin linn, sho\vs very similar characteristics, except that it has a considerably higher fineness ratio. The Deperdussin section has, according to Eiffel's tests, a maximum lift coefficient of o"36 (Absolute) at an angle of incidence Another form of reversible propeller, in which the pitch may be said to be uniform, but the angles of attack vary. of 15°, while at the more usual angle for a propeller blade, i.e., about 6°, the lift coefficient is 016. These values are not very high compared with other aerofoil sections, and it would be interesting to sec whether the section would prove more efficient on a screw. The lift/drag ratio of the Deperdussin section men tioned above is about 77 at an angle of incidence of 6°, which is not very encouraging. sufficient accuracy the general peculiarities, which are that for the top camber the maximum ordinate is situated from about half-way to quarter of the chord from the leading edge, while in the lower surface the position is reversed, the maximum ordinate being situated from one-half to one-quarter of the chord from the trailing edge. Whether this section would be very efficient considered as an aerofoil is impossible m m SIDE-WINDS. MR. FRED NORMAN, late of the Scottish Aviation Co., Glasgow, who was the first man to fly a Scottish-built aero plane—the Caledonia monoplane in 1911—is now. under the name of the National Aircraft Manufacturing Co., Printing House Yard, 15A, Hackney Road, N.E., busily engaged in turning out woodwork for aeroplanes, spars, struts, ribs, &c. FURNITURE makers are evidently a very enterprising com munity. This has been apparent from the way in which many of them have given up making dining-room suites in favour of building aeroplanes. Looking in at the fifty-sixth concert of the Furniture and Allied Trades Society at the King's Hall, Holborn Restaurant, on the evening of the Lord Mayor's Show, it seemed that aeroplane building must be an " Allied trade." Many familiar faces were to be seen, including Mr. S. J. Waring, of Waring and Gillow, Ltd., who made a most popular Chairman. The concert was in aid of the Furnishing Benevolent Association, to which Mr. Waring has been such a good friend apart from the £1,000 which he gave by way of a start. The Association is doing splendid work not only at the home at Radlett, but also in assisting those who are fallen on evil days, and up to the last concert the musical society has contributed £288 8s. yd. to help on the excellent work. THE concert was a splendid one, and the audience most enthusiastic, which will be understood when it is mentioned that Mr. A. H. Botwright was the musical director. Songs were contributed by Miss Olive Sturgess, Miss Winnie Melville, Miss Winifred Dunk, Mr. Frederick Lake, Mr. Edward Dykes, Mr. Bromley Carter, Mr. Roland Merry ; while Mis'- Dome Courtney played banjo solos, and littls Miss l"iii Hallam recited. Two unexpected turns were Coram the ventriloquist and his orderly, and Mr. Ernest Hastings, who, by the kindness of Mr. Clias. Gulliver, of the Palladium, were able to spend a few minutes at the concert, and their efforts were greatly appreciated. ALTHOUGH, of course, the oxy-acetylene welding process of repairing cracks and fractures of cylinders, crankshafts, aluminium castings of all descriptions, &c, is well known to most people, there are many who are not aware that the process can be utilised in other ways. Thus, Imperial Light, Ltd., of 123, Victoria Street, S.W., apart from the great increase in this department of their repair works, also report a good deal of activity in building up worn gears, which are after wards machined and case-hardened so that they arc returned to the owner equal to new in every respect. The construc tional department of the works is also engaged extensively on the welding up of aeroplane parts. From their wide experience during the past eight years, the firm are in a position, in most cases, to quote a close price before putting the work in hand. 1015
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