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Aviation History
1937
1937 - 2219.PDF
AtKUST 12; I937-" ADVERTISEMENTS. FLIGHT. 5 THE AERONAUTICAL CORRESPONDENT OF truing WRITES: "An aeroplane was pulled upwards almost vertically by a new type of British constant speed airscrew demonstrated at the display held by the Society of British Aircraft Constructors at Hatfield Aerodrome yesterday. It was the most astonishing take-off I have seen. The run, according to my stop watch, took only 4| seconds from when the machine began to move to the moment the wheels were off the ground—and then the machine stood on its tail and soared It did more than a helicopter or other moving wing machine, because it went on climbing right up to the cumulus clouds several thousand feet above the aerodrome. This new constant speed airscrew is a triumph of British development and the demonstration showed the effects it will have when it comes into general use. Its special features are automatic variation of blade angles to suit engine power and the altitude of the aeroplane, an overriding control by the pilot, and great lightness. The blades are made of magnesium alloy, and the total weight of the airscrew for an engine rated at 795/825 horse power is only 288 lbs., which is less than airscrews with only two blade positions. For an engine of 875/915 horse power, the airscrew, of 12 ft. 8| ins. diameter, weighs 344 lbs THE MAGNESIUM ALLOY REFERRED TO IS ELEKTRON AZ855, AND THE BLADES OF THE AIRSCREW ARE MACHINED FROM PRESSINGS MANUFACTURED BY THE LARGEST PRODUCERS OF AIRSCREW BLADE FORGINGS IN THE WORLD:— JAMES BOOTH & COMPANY (1915) LIMITED ARGYLE STREET WORKS, BIRMINGHAM, 7 Kindly mention " Flight" when corresponding with advertisers.
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