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时间: 2019年12月11日 22:50

All this, however, assumes that the Schwartz type鈥攖he first rigid dirigible, by the way鈥攚ould prove successful. As it proved a failure on the first trial, the problem of filling it did not arise again. � In the matter of rigid design it was not until 1913 that the British Admiralty got over the fact that the 鈥楳ayfly鈥?would not, and decided on a further attempt at the construction of a rigid dirigible. The contract for this was signed in March of 1914; work was suspended in the following February and begun again in July, 1915, but it was not until January of 1917 that the ship was finished, while her trials were not completed until March of 1917, when she was taken over by the Admiralty. The details of the construction and trial of this vessel, known as 鈥楴o. 9,鈥?go to show that she did not quite fill the contract requirements in respect of disposable lift until a number of alterations had been made. The contract specified that a speed of at least366 45 miles per hour was to be attained at full engine power, while a minimum disposable lift of 5 tons was to be available for movable weights, and the airship was to be capable of rising to a height of 2,000 feet. Driven by four Wolseley Maybach engines of 180 horse-power each, the lift of the vessel was not sufficient, so it was decided to remove the two engines in the after car and replace them by a single engine of 250 horse-power. With this the vessel reached the contract speed of 45 miles per hour with a cruising radius of 18 hours, equivalent to 800 miles when the engines were running at full speed. The vessel served admirably as a training airship, for, by the time she was completed, the No. 23 class of rigid airship had come to being, and thus No. 9 was already out of date. Mr Weaver also notes briefly the construction of the 1905 Wright flier. 鈥楾he frame was made of larch wood鈥攆rom tip to tip of the wings the dimension was 40 feet. The gasoline motor鈥攁 special construction made by them鈥攎uch the same, though, as the motor on the Pope-Toledo automobile鈥攚as of from 12 to 15 horse-power. The motor weighed 240 lbs. The frame was covered with ordinary muslin of good quality. No attempt was made to lighten the machine; they simply built it strong enough to stand the shocks. The structure stood on skids or runners, like a sleigh. These held the frame high enough from the ground in alighting to protect the blades of the propeller. Complete with motor, the machine weighed 925 lbs.鈥? More wall-paper, Cassy, said her husband, flinging himself on the sofa. � 白白色,白白色发布,白白色图片,白白小明看看主页,白白色在线播放观看 Well, I don't wish to use an offensive phrase. You will write to oblige me. It has been put off long enough. 鈥楢re you ready?鈥?he said, and dictated. Maxfield, who had been struggling to reach the bell, pulled it so violently that the wire was broken. At the peal Betty Grimshaw came running in, terrified. "Mercy, brother-in-law!" she cried. "What is it?" � Old Max struck his hand sharply on the table as he exclaimed, almost with a snarl, "I will not be hurried, sir! nor made to speak rashly and without duly pondering and meditating my words." Then he added, in a different tone, "You are glib, sir! mighty glib! Do you know what Miss Maxfield will have to her portion鈥攊f I choose to give it her?"