| 单词 | airscrew |
| 例句 | An engine of four horse-power, weighing forty pounds, with a wooden airscrew five feet in diameter, was, by his calculations, amply sufficient to maintain his glider in horizontal flight. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force The machine gun soon followed, but its use in tractor machines was impracticable on account of the danger of hitting the airscrew. Aviation in Peace and War A larger model, with two airscrews driven by clockwork, was exhibited in 1850 by M. Jullien, a clockmaker of Paris, and flew successfully against a slight breeze. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force The airscrew, ten feet in diameter, was driven by a steam-engine of three horse-power, and the speed attained was about six miles an hour. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force This ship, with an airscrew driven by manpower, attained a speed of five and a half miles an hour. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force They planed down at once, and landed in a small field, finishing up in a wood, where they damaged their undercarriage, wings, and airscrew. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force Towards the close of the century a German engineer called W�lfert constructed a dirigible rather smaller than the French airship, with a slightly more powerful engine, and two airscrews of twelve feet in diameter. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force A good illustration of this may be found in the question of the airscrew. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force In all but a few types of machine the airscrew is now retained in the forward position. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force It took the air near Berlin on the 3rd of November 1897, but something went wrong with the airscrew belts, and it was seriously damaged in its hasty descent. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force Mr. William Cochrane, in a paper read a few months earlier, laid it down that the airscrew must give place to a more efficient form of propulsion. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force The observer, being seated in the very prow of the machine, could fire a gun forward without being obstructed by the airscrew. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force On this scale he was successful with a machine driven by an airscrew and with a machine driven by the flapping of wings. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force This toy, which weighed only a little over half an ounce, was supported on wings, and was driven forward by an airscrew made of two feathers. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force The motive power was supplied by twisted strands of rubber which, as they untwisted, turned the airscrew. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force Senhor Augusto Severo, a Brazilian, made a spindle-shaped airship, ninety-eight feet long, driven by two airscrews, placed one at each end of a framework which formed the longitudinal axis of the airship. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force The airscrews, built from their own calculations, gave in useful work two-thirds of the power expended. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force Long before the first true flying machine was built and flown balloons of a fish-like shape had been driven through the air by mechanical airscrews. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force Henson, completely discouraged, married and went to America; Stringfellow persisted, and in 1848 made a smaller model, ten feet in span, with airscrews sixteen inches in diameter. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force The first of these objections was not fully met until firing through the airscrew was introduced; the second was for a long time an accepted idea. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force The wings were set at a dihedral angle, that is, they were bent upwards at the tips; and fore-and-aft stability was secured by a smaller pair of wings just in front of the airscrew. The War in the Air; Vol. 1 The Part played in the Great War by the Royal Air Force |
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