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Aviation History
1910
1910 - 0368.PDF
I/PGHT] with the favour of manufacturers and be adopted in practice. Practical examples of the use of such curves appeared in " Naval Constructor's " article in FLIGHT, Vol. II, p. 124. Now reverting to the main theme of the static thrust test of propellers, the question is, can values of K be obtained by this means. It would seem to be impossible, for K essentially co-relates thrust to flight speed, and that flight speed must be artificially introduced into the test, otherwise the relationship between thrust and revolutions (which is equally important) will be inexact. On the other hand, the static thrust test offers an opportunity of investigating the practical values of the coefficients of disc area (c) and pitch if) that is of great value, and the results of such tests MAY 14, 1910. should contribute largely to a proper understanding of the action of an aerial screw. Some Static Thrust Charts. The first tests carried out on Mr. May's plant were made on an Asco propeller, and the results are shown in the accompanying diagram and tables. It will be observed that the tests included measurements of the rr.t 0 of thrust to horse-power and revolutions to horse-power. An investigation of the velocity of the slip stream in different regions of its cross section was also carried out, and an interesting curve has been plotted from the results. This indicates that the velocity is greatest in the region that is represented by an annulus situated 0-3 of the diameter of the propeller from the axis of rotation. SIR CHARLES FORBES' MODEL MONOPLANE. " Flight " Copyright. Two views of the model monoplane built by William Cochrane to the designs of Sir Charles Forbes, Bart. It will be noticed that the main planes are shaped rather like a bird's wing. AN interesting and somewhat novel type of model monoplane, built by Mr. William Cochrane to the designs of Sir Charles Forbes, Bart., is depicted in the accompanying illustrations. It is made of aluminium tubing and wood, the total length is 3 ft. 6 ins., and the span is about 3 ft. 4 ins., whilst the height is nearly 1 ft. The main planes are shaped somewhat like a bird's wing, but are very much arched. The tips of the planes can be warped by means of pedals, and the trailing edges of the main planes are slightly flexible. Hart's fabric is used for covering the planes, and the ribs are of ash bent to shape. Most of the draught from the 10-inch Coch rane propeller is forced under the main planes, little going above them. A very neat landing chassis, with rubber tyred wheels and skids, is fitted, the action of which is shown in the accompanying diagram. The elevator-tail, which has ribs made of thin strips of box-wood, is carried on a sprung and pivoted rubber - tyred wheel. A hand-wheel on the right-hand side of the aviator's seat, which is just behind Diagrams showing the action of the landing chassis for the model monoplane built by Mr. William Cochrane. the trailing rudder, and elevator-tail. edge of the main planes, controls the a lever on the left-hand side operates the A PROPOSED DESIGNING AND BUILDING CLUB FOR AMATEUR AIR-MEN IN LONDON. MESSRS. J. D. NORTH and H. A. Myers, writing from 11, West- bourne Squat e, W., seek to enlist our sympathies on behalf of a club of a somewhat novel character that they are desirous of bringing into being in the Metropolis. Their idea, as they express it, is " to fill a long-felt want by bringing to a practical issue some of the many valuable inventions now in abeyance owing to lack of oppor tunity to test and patent them." At the same time they submit to us the principal rules that they propose, though we regret that space prevents our setting them forth in detail. Suffice it to say that the general idea is for the club to establish a workshop of its own in London, that the funds of the club are to be used for equipping it, and for securing the use of a trial ground, that the actual work undertaken by the members will be determined by the committee appointed for the purpose, and that not only will the machines built be the property of the club, but that those machines will be entered by the club itself at any aviation meetings that may be selected. Possibly we may feel that the scheme savours somewhat of the Utopian, but for all that there is no real reason why it should not prove a success ; and at any rate it has our very best wishes. Those desirous of further particulars should communicate with the gentlemen referred to above, at the address that we have mentioned. 366
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