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时间: 2019年12月09日 18:31

Mention has already been made of the founding of the Aeronautical Society of Great Britain, which, since 1918, has been the Royal Aeronautical Society. 1866 witnessed the first meeting of the Society under the Presidency of the Duke of Argyll, when in June, at the Society of Arts, Francis Herbert Wenham read his now classic paper Aerial Locomotion. Certain quotations from this will show how clearly Wenham had thought out the problems connected with flight. � Is it so difficult, Rhoda? � 鈥淓xcuse me,鈥?I said. 鈥淒id you say Arnulfo is coming?鈥? While Pilcher was carrying on Lilienthal鈥檚 work in England, the great German had also a follower in America; one Octave Chanute, who, in one of the statements which he has left on the subject of his experiments acknowledges forty years鈥?interest in the problem of flight, did more to develop the glider in America than鈥攚ith the possible exception of Montgomery鈥攁ny other man. Chanute had all the practicality of an American; he began his work, so far as actual gliding was concerned, with a full-sized glider of the Lilienthal type, just before Lilienthal was killed. In a rather rare monograph, entitled Experiments in Flying, Chanute states that he found the Lilienthal glider hazardous and decided to test the value of an idea of his own; in this he followed the same general method, but reversed the principle upon which Lilienthal had depended for maintaining his equilibrium in the air. Lilienthal had shifted the weight of his body, under immovable wings, as fast and as far as the sustaining pressure varied under his surfaces; this shifting was mainly done by moving the feet, as the actions required were small except when alighting. Chanute鈥檚 idea was to have the operator remain seated in the machine in the air, and to intervene only to steer or to alight; moving mechanism was provided to adjust the wings108 automatically, in order to restore balance when necessary. 青青青视频分类精品-免费自拍刺激视频免费播放-色综合亚洲欧美图片区-做爱视频免费 鈥淗ey, Bear,鈥?the shopkeeper continued. 鈥淒o you know that Arnulfo has never been beaten? Doyou know he鈥檚 won the one-hundred-kilometer race three times in a row?鈥? � � Horatia. His sudden alarm.... A later development of the Green engine was a six-cylindered vertical, cylinder dimensions being 5.5 inch diameter by 6 inch stroke, developing 120 brake horse-power when running at 1,250 revolutions per minute. The total weight of the engine with ignition system400 was 440 lbs., or 3.66 lbs. per horse-power. One of these engines was used on the machine which, in 1909, won the prize of 锟?1,000 for the first circular mile flight, and it may be noted, too, that S. F. Cody, making the circuit of England in 1911, used a four-cylinder Green engine. Again, it was a Green engine that in 1914 won the 锟?,000 prize offered for the best aero engine in the Naval and Military aeroplane engine competition.