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Aviation History
1909
1909 - 0553.PDF
SEPTEMBER u, INVENTORS' IDEAS. DIRIGIBLE WITH GYROSCOPES. This patent describes the fitting of vertical and horizontal gyro- scopes (A, B) for steadying a dirigible constructed with two gas- bags, either arranged side by side or on top of one another. The claims also cover the use of a sliding weight (C) for balancing such an airship. Patent No. 16,606 of 1908. W. Friese Greene and Friese Greene Patents. A "NARROW" BIPLANE. A biplane is described so arranged as to travel in the direction of its larger axis. The planes consist of slats with a space eo^ual to the width of a slat between each. Steering and controlling is effected by the hinged corner tips, which may be operated simultaneously or independently. It will be seen that each main plane is divided into three portions, those at the side being at an upward angle of about eight degrees with the central section. Patent No. 19,805 of 1908.E. H. Hape. WRIGHT FLEXING PATENT-SPECIAL NOTE. The British patent covering the system adopted by the Wright Brothers for flexing the elevator as used on their latest machines, and described in FLIGHT of February 6th, 1909, and August 7th last, has just been issued. It is numbered 16,068 of 1909. AEROPLANE LAUNCHING TURNTABLE. An apparatus for launching aeroplanes in any direction is described in this patent. The aeroplane is mounted on a carriage to which is attached a piston working in a cylinder. A charge of suitable gas behind the piston gives the necessary impetus to the carriage for launching the flying machine, and to enable this to be done in any direction the whole apparatus is mounted on a turntable. Patent No. 9,610 of 1909. J. Means. TESTS OF MODEL PROPELLERS. WRITING from King's College, Cambridge, Mr. H. W. Holt sends us some further figures with regard to air- propellers or fans driven by a small electric motor. He says :—" As model propellers seem to be greatly discussed at the moment, I am sending the results of a rough test done by myself at the laboratories here on two propellers made by a friend. They were made as patterns for an aluminium casting. The motor used is supposed to be |;-h.p., though it has given as much as i-h.p. The thrust was measured by a lever with a 3—1 advantage, pressing against the the motor spindle through a steel ball (there was about £ in. side play on spindle). Weights were lifted by the propeller thrust ; the propeller remaining practically stationary. A rough calculation of the slip gives No. 1, slip efficiency, 45 per cent; No. 2, slip efficiency, 46 per cent. I ran a light load test of the motor at various speeds, noting power consumed, this I subtracted from power in driving propeller, so endeavouring to get power transmitted approximately." The results in question are shown in the following tables in connection with which it is only necessary to state that both propellers had an overall diameter of 17^ ins., with a blade-width of 2^ ins. at the tip, but that whereas No. 1 had a 21-in. pitch, the pitch of No. 2 was 26 inches :— Speed. ( 2,880 I 2,788 No ii2'5°fN°- 2,356 1,964 11,360 ("2,464 2,424 2,264 No. 2 -\ 2,080 2,020 1,672 L 1,496 Volts. 192 180 155 143 107 63 194 186 164 142 135 103 87 Amps.' 3'3 2'6l 2-42 1-88I- 3 3-85 3-8 3"4 2"95 2-8 2-15 1*92 Watts. 633 558 405 346 201 82 750 707 558 418 378 222 167 Trans-mitted Watts. 550 480 342 291 168 67 690 649 5°9 379 342 202 150 h.p. •738 •644 •459 •39 •225 •090 •92 •87 •682 •5O7 •459 •271 •201 Thrust. lbs.54 5 4 3 2 1 54 5 4 343 2 1 557
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