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时间: 2019年12月06日 03:11

Daresby. The trail veered abruptly upward again, jagging back and forth in lightning-bolt switchbacks. After the adjustments for actual flight had been made in the Curtiss factory, according to the minute descriptions contained in the Langley Memoir on Mechanical Flight, the aeroplane was taken to the shore of Lake Keuka, beside the Curtiss hangars, and assembled for launching. On a clear morning (May 28th) and in a mild breeze, the craft was lifted on to the water by a dozen men and set going, with Mr Curtiss at the steering wheel, esconced in the little boat-shaped car under the forward part of the frame. The four-winged craft, pointed somewhat across the wind, went skimming over the wavelets, then automatically headed into the wind, rose in level poise, soared gracefully for 150 feet, and landed softly on the water near the shore. Mr Curtiss asserted that he could have flown farther, but, being unused to the machine, imagined that the left wings had more resistance than the right. The truth is that the aeroplane was perfectly balanced in wing resistance, but turned on the water245 like a weather vane, owing to the lateral pressure on its big rear rudder. Hence in future experiments this rudder was made turnable about a vertical axis, as well as about the horizontal axis used by Langley. Henceforth the little vertical rudder under the frame was kept fixed and inactive.7 It will be seen, therefore, that my duty has been merely to pass the book through the press conformably to the above instructions. I have placed headings to the right-hand pages throughout the book, and I do not conceive that I was precluded from so doing. Additions of any other sort there have been none; the few footnotes are my father鈥檚 own additions or corrections. And I have made no alterations. I have suppressed some few passages, but not more than would amount to two printed pages has been omitted. My father has not given any of his own letters, nor was it his wish that any should be published. � � 亚洲 自拍 色综合图区 网友自拍 偷拍 校园 在线自拍在线偷拍视频 欧美 ,亚洲图片自拍区 2018偷拍自自拍亚洲 亚洲图片自偷自拍另类 In no longer time than it would take for a breath to dim the mirror all these images were gone, and the cold shiny glass indifferently showed a confusion of cloaks and shoulders and the back of a huge bonnet crowning Mrs. Errington's majestic figure. � 鈥楢nd then saying to Alice, 鈥淚 think you and my slippers have met before!鈥?That was fun, was it not? I saw you enjoyed that, Thomas, and{309} when you are pleased, I鈥檓 sure the joke is good enough for anybody. I wish I had asked Lord and Lady Inverbroom to dine to-night. They would have enjoyed it too, though perhaps he would feel a little shy of meeting you after that snub you gave him and his Club in taking their premises away from them.鈥? When the R.F.C. was founded鈥攁nd in fact up to two years after its founding鈥攊n no country were the full military potentialities of the aeroplane realised; it was regarded as an accessory to cavalry for scouting more than as an independent arm; the possibilities of bombing were very vaguely considered, and the fact that it might be possible to shoot from an aeroplane was hardly considered at all. The conditions of the British Military Trials of 1912 gave to the War Office the option of purchasing for 锟?,000 any machine that might be awarded a prize. Machines were required, among other things, to carry a useful load of 350 lbs. in addition to equipment, with fuel and oil for 4? hours; thus loaded, they were required to fly for 3 hours, attaining an altitude of 4,500 feet, maintaining a height of 1,500 feet for 1 hour, and climbing 1,000 feet from the ground at a rate of 200 feet per minute, 鈥榓lthough 300 feet per minute is desirable.鈥?They had to attain a speed of not less than 55 miles per hour in a calm, and be able to plane down to the ground in a calm from not more than 1,000 feet with engine stopped, traversing 6,000 feet horizontal distance. For those days, the landing demands were rather exacting; the machine should be able to rise without damage from long grass, clover, or harrowed land, in 100 yards in a calm, and should be able to land without damage on any cultivated ground, including rough ploughed land, and, when landing on smooth turf in a calm, be able to pull up236 within 75 yards of the point of first touching the ground. It was required that pilot and observer should have as open a view as possible to front and flanks, and they should be so shielded from the wind as to be able to communicate with each other. These are the main provisions out of the set of conditions laid down for competitors, but a considerable amount of leniency was shown by the authorities in the competition, who obviously wished to try out every machine entered and see what were its capabilities. �