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Aviation History
1912
1912 - 0722.PDF
[/JJGHT AUGUST IO, 1912. engine for the weight carried and is, moreover, supporting it in a small area. Had the area been large, the speed essential for support would be low and the power necessarily expended under this head less, thus leaving more for the purpose of speed or overcoming extraneous head resistance. Similarly, a high loading by itself has little significance unless the power of the engine is taken into account. Possibly the method of combining these factors in the present investigation may not be highly scientific and it is admittedly hurried. In any case, however, it suggests a line of thought that readers of FLIGHT may like to discuss, and it seems sufficiently evident that some sort of " figure of merit" is wanted if we are going to get any sort of idea of what relative use is being made of engine power on modern machines in a comparative trial of various types such as the Military Competition that is about to commence. Reverting to the table, it is interesting to observe how widely the constant X differs for the various machines. In the Avro, with the Green engine, it is 161 ; in the Mersey, with the Isaacson, it is 73*8. In the Piggot, which has only a 35-h.p. Anzani and 100 sq. ft. of surface to carry 700 lbs., it is 141. An average value, and by inspection of the figures, is apparently in the order of 100. The only fixed quantities are the area and the weight; unfortu nately, the power is an uncertain value, and although this emphasises the importance of X as a useful figure, it is not conducive towards accuracy. In other columns the dimensions of the engines are given, including the cylinder capacities, and the cubic inches per h.p. of piston displacement. This is always a useful value to have in any comparative table of engines, for it indicates in some measure the type of motor employed, and is a slight indication as to whether the maker's ruling is under or over the probable capacity of the engine. Estimates based on capacity must be made with care, for it is possible to get a h.p. from about 3 cubic inches and upwards. The corresponding value for the Gnome design is nearer 10. The Mercedes is only 5'5, and the Anzani 5'9. These and many other considerations are suggested by our little table, and the progress of the trial should help materially to fix ideas on some of them. Salisbury, Tuesday, noon. Five a.m. and a bleak and rainy morning. It is not encouraging, and the prospect of any pilot venturing on the three hours' test or the speed trial under such conditions is remote in the extreme. The blue flag flies at the staff-head, officially it is " good enough " ; two army machines take the air for a spell to give colour to this opinion, but there is a difference between flying for as long as you please Engines in the Military Trials, 1912. Motor. h.p . , lbs . Wei g , h.p . £ "E C71 in 1 . , are a £ Wei g -~* -^^Ir Aeroplane. Is. ^ U V 0 m V 0 a en Gnome 701172 16*7 1214 70,1277 18-25 7oji45oJ2o,7 801113516-9 . 8011365 80J1365 . 100 1950 . 1002120 100 2000 [ 20 ioo, 1400114 ioo!i4oo'i4-o Canton Unne AustroD. Green ... t, A.B.C. ,, Anzani.. I, Chenu ... ,, Isaacson Mercedes ft Renault Viale ... N.E.C. 100J150P 100I1500 11012150 1102100 1202140 120 1202000 60 — 6011800 6011800 100J2000 20 35j 70020 10012000 751800 11 oj 2050 45; II 50 70:2290 100:1870 70; 2000 7°i — 15-0 15-0 I9-S 19-1 17-8 297 240 165 258 :25« i3S° 424 1270 248 248 269 269 465 5*5 4'3 'i '2 28 28 44 o 9 65 65 77 77 S 4-62 465)4-52 X. 9i-8Bleriot 78-51 „ • 126 H. Page . 138 Borel 00-5 Bristol .. 9o-5i ,, 106 Coventry.. 106 Bristol Brit. Dep. Fr. Dep... 148 79 79 86 86 90 SS Hanriot Breguet 16-7 5004- 77 3351S-38, 335 5-38j 400 5'ooj 10017'oo' 12707-4 3105-8 3005-83 400 425 350 700 161 162 IOO 140 149 139 no 73-8 178 89 81-7 130 120680 ...) Lohner .. Cody (M.) ,, (B.) Harper ... Avro ... »> Handley ... Piggot Brit. Dep. Martin H. Coventry... Mersey ... Bristol ... King Avicraft ... Vickers ... • Ariel Wheel Weight complete in flight. 124 14 no 1407209-0 120 140 112 120 3 U 9'7 965 1408707-2 9-65. 146 120 548 576 105 130 206 IO5 125 752 no 190660 96 140 120 9-1 7-2 5-9; 7-52- 8-8 385 5-5 1, 4256-1 / •t u iw ."Z&f? u jniV^" \ * * *p f •h \ / K fit m\ V t M • 1 \ \ W ' U 7 '" 'i ~\* fr »&^ a. , ft?**J^MP^]! m ^v ^ »1 ^^ .... r• /* * , J fLlGHT "Flight" Copyright. THE MILITARY AEROPLANE COMPETITION.—Assembling the Cody biplane before the judges. Mr. S. F. Cody,. ever active, assists in the operations. The photograph on the right shows the central part of the machine. The passenger seat, projecting from the side ol the engine-bed, is worthy of note. 722
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