Speed and Power of Birds
In an article in'the " Forum " Professor R. H. Thurstou says : The vulture is said to fly, at times,.at the r;ito of about 100 miles an. hour;.'the wild goose iand the swallow, in", their .migrations, make 90 miles an hour and the carrier pigeon has certainly flown long 'distances at the rates of speed ranging from 60' up to 80 miles an hour, and for, many hours together. The., common crow ordinary lounges across country at.the' rate of 25 miles ari'-hour. the speed of a railway train. Professor Laiigley finds that the power exerted by the eagle in full flight is but a fraction of ■1 horse horse 'power. Mr Chanute compares the jfcw ( (Br exerted by a'| pigeon flying 2200 ft "per minute, 25 miles an hour, nearly, at ; -l-lO0th : of « ¥i horse-power per pound, or 9£ horse-power for a flying' machine of equally good form, weighing one ton at 25 miles an hour, 1 or about' 50 horse power per ton weight at 50 .miles.. Mr Wen ham, a member of the British Aeronautical Society, finds in the 'pelican, an expenditure of 1-llth horse-power by 211bs of bird, and this is 1 horse-power to 2301b5, or about a horse-power for the weight of a man, allowing ample 'margin for surplus power! The birds are found to have a surplus lifting power of about I bne-hifilf. '• Professor Lauglcy has purchased recently for the Smithsonian Institution the prize steam engine 1 of, the Aeronautical Society of l-68th, which, with T}fto .cars and scrows, weighs only 161bs, and but thirteen without these essentials. To the engineer these facts certainly' look encouraging. ■ .
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Speed and Power of Birds, Ashburton Guardian, Volume VII, Issue 2452, 27 June 1890
Speed and Power of Birds Ashburton Guardian, Volume VII, Issue 2452, 27 June 1890
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