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Aviation History
1912
1912 - 0815.PDF
SEFIEMBEK 7, 1912. I/PCHT] WEIGHING THE Hanriot 1 Hanriot 2 Bleriot Tan Bleriot Soc. ... AVTO ... Bristol Mon. 14 Bristol Mon. 15 British Dep. 21 M. Farman ... French Dep. ... Cody MAI X 7« 7S 71 so 72 107 111 7S w 7i 05 :HINI V max 75'2 75-4 6o-8 58-9 61-8 70-5 72-9 68-2 55-2 69-1 72-4 " Flight" Copyright. -The aeroplane undergoing the operation Is No. 4, SPEEDS. V min. 59-9 66-6 51-0 4C0 49"3 68-3 58-' 54"6 37-4 59-0 48-5 R . 25-6 13-2 '7'5 47-3 25'4 3-2 26-0 26-0 47-6 17-1 494 % 6) 68 64 38 02 59 x = X + 2 = speed proper to the design. V max. = mean fastest speed acquired. V min. = mean slowest speed acquired. Vg. = gliding speed. The first column in the table gives the speed appropriate to the design, as obtained by dividing X by 2, the explanation of this having already been given. The second column is the actual maximum flight speed attained. It may be said that four machines approximated closely to their proper flight speeds, if x does in fact represent the proper speed. The two Bristol monoplanes ought, according to this argument, to fly at over 100 m.p.h. in order to be in harmony with their present weight and wing surface. The speed actually attained by these machines is already high for the power available, as is indicated elsewhere by the fact that they showi an efficiency in the order of 80 per rent. The high value of x, therefore, indicates an absence of the reserve for climbing rand acceleration that ought to accompany the performance. The natural speed of the Farman is virtually identical with its gliding speed, which i-i given in the last column, and the increase represented by the maximum speed results from the use of the large amount of reserve power, the machine having been designed for a low anticipated efficiency, as is indicated elsewhere. The same remark applies to the Cody. The minimum speed is given in the next column and the range lis expressed as a percentage increase in the third column. The Bristol monoplane 15 and the Hanriot monoplane 1 obtained their high range by the dexterity of the pilots, who switched off the ignition intermittently. The performance of the Bleriot Sociable, however, was produced by throttlirg. Between 17 and 20 per cent, variation seems to be a fair value to expect from monoplanes. The determining factor in speed range, apparently, is the factor of anticipated efficiency, the lower values giving higher speed ranges; it will be found that the Farman, the Cody and the Bleriot Sociable, which have a marked superiority in the matter of speed range are likewise those with the lowest values of c. "Flight" Copyright. WEIGHING THE PILOTS IN THE ARMY TESTS.—Mr. S. F. Cody undergoing the ordeal. On tbe extreme right is Sir George White, the founder of the British and Colonial Aeroplane Co,, Ltd., the constructors of the famous Bristol machines. 815
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