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时间: 2019年12月14日 07:29

Oh, I shouldn't think of disturbing my lady at this hour, said Algernon, "but I must speak with Lord Seely. It is of the very greatest importance." � � Before turning to consideration of the work accomplished by the Brothers Wright, and their proved conquest of the air, it is necessary first to sketch as briefly as may be the experimental work of Sir (then Mr) Hiram Maxim, who, in his book, Artificial and Natural Flight, has given a fairly complete account of his various experiments. He began by experimenting with models, with screw-propelled planes so attached to a horizontal movable arm that when the screw was set in motion the plane described a circle round a central point, and,128 eventually, he built a giant aeroplane having a total supporting area of 1,500 square feet, and a wing-span of fifty feet. It has been thought advisable to give a fairly full description of the power plant used to the propulsion of this machine in the section devoted to engine development. The aeroplane, as Maxim describes it, had five long and narrow planes projecting from each side, and a main or central plane of pterygoid aspect. A fore and aft rudder was provided, and had all the auxiliary planes been put in position for experimental work a total lifting surface of 6,000 square feet could have been obtained. Maxim, however, did not use more than 4,000 square feet of lifting surface even in his later experiments; with this he judged the machine capable of lifting slightly under 8,000 lbs. weight, made up of 600 lbs. water in the boiler and tank, a crew of three men, a supply of naphtha fuel, and the weight of the machine itself. These A.B.C. radials have proved highly satisfactory on tests, and their extreme simplicity of design and reliability commend them as engineering products and at the same time demonstrate the value, for aero work,468 of the air-cooled radial design鈥攚hen this latter is accompanied by sound workmanship. These and the Cosmos engines represent the minimum of weight per horse-power yet attained, together with a practicable degree of reliability, in radial and probably any aero engine design. � 日本一本到道一区免费_欧美日本一道本免费三区_日本高清一道本二区 18 Then Eve said, "What is that matter, O Adam?" In England Lilienthal鈥檚 work was carried on by Percy Sinclair Pilcher, who, born in 1866, completed six years鈥?service in the British Navy by the time that he was nineteen, and then went through a course of engineering, subsequently joining Maxim in his experimental work. It was not until 1895 that he began to build the first of the series of gliders with which he earned his plane among the pioneers of flight. Probably the best account of Pilcher鈥檚 work is that given in the Aeronautical Classics issued by the Royal Aeronautical Society, from which the following account of Pilcher鈥檚 work is mainly abstracted.2 � 11 He then sent for us鈥攁ccording to the orders in which we were鈥攖o come under his command, and to accept his vein promise. But we would not, and we did not take his advice. �