鈥業t was not till several months had passed, and every phase of the problem had been thrashed over and over, that the various reactions began to untangle themselves. When once a clear understanding had been obtained there was no difficulty in designing a suitable propeller, with proper diameter, pitch, and area of blade, to meet the requirements of the flier. High efficiency in a screw-propeller is not dependent upon any particular or peculiar shape, and there is no such170 thing as a 鈥渂est鈥?screw. A propeller giving a high dynamic efficiency when used upon one machine may be almost worthless when used upon another. The propeller should in every case be designed to meet the particular conditions of the machine to which it is to be applied. Our first propellers, built entirely from calculation, gave in useful work 66 per cent of the power expended. This was about one-third more than had been secured by Maxim or Langley.鈥? Roland stared at his father in anger and dismay. Could he really mean it? Had he been won over to Oliver's side? Oliver, too, was surprised. He began to entertain a much more favorable opinion of his step-father. Mrs. Jud. To tell the truth there is a young.... You ought to be very proud of your husband, Mrs. Disney, said Vansittart Crowther, with his air of taking all the world under his protection. Have you brought back the receipt? asked his employer, before he had a chance to speak. N ANCY was not likely to turn pale, even if she had been frightened. Really, however, she was not frightened, having considerable nerve. 成年片黄色日本电影网站视频 - 视频 - 在线观看 - 影视资 Farman鈥檚 world record, which won the Grand Prix de Champagne, was done with a Gnome Rotary Motor which had only been run on the test bench and was fitted to his machine four hours before he started on the great flight. His propeller had never been tested, having only been completed the night before. The closing laps of that flight, extending as they did into the growing of the dusk, made a breathlessly eerie experience for such of the spectators as stayed on to204 watch鈥攁nd these were many. Night came on steadily and Farman covered lap after lap just as steadily, a buzzing, circling mechanism with something relentless in its isolated persistency. Yes, he told me so, and that was the last time I saw him. If he had stayed in the city he would have kept on comin' to my place, or I should have met him somewhere. The rosebuds that bloom on thy fat little cheek,鈥? I couldn't stay in that house. I should have died there. Everything in every room reminded me of you. Development of the early Daimler type brought about the four-cylinder vertical Mercedes-Daimler engine of 85 horse-power, with cylinders of 5.5 diameter with 5.9 inch stroke, the cylinders being cast in two pairs. The overhead arrangement of valves was adopted, and in later designs push-rods were eliminated, the overhead cam-shaft being adopted in their place. By 1914 the four-cylinder Mercedes-Daimler had been partially displaced from favour by a six-cylindered model, made in two sizes; the first of these gave a nominal brake horse-power of 80, having cylinders of 4.1 inches diameter by 5.5 inches stroke; the second type developed 100 horse-power with cylinders 4.7 inches in diameter and 5.5 inches stroke, both types being run at 1,200 revolutions per minute. The cylinders of both these types were cast in pairs, and, instead of the water jackets forming part of the casting,403 as in the design of the original four-cylinder Mercedes-Daimler engine, they were made of steel welded to flanges on the cylinders. Steel pistons, fitted with cast-iron rings, were used, and the overhead arrangement of valves and cam-shaft was adopted. About 0.55 pint per brake horse-power per hour was the usual fuel consumption necessary to full load running, and the engine was also economical as regards the consumption of lubricating oil, the lubricating system being 鈥榝orced鈥?for all parts, including the cam-shaft. The shape of these engines was very well suited for work with aircraft, being narrow enough to admit of a stream-line form being obtained, while all the accessories could be so mounted as to produce little or no wind resistance, and very little obstruction to the pilot鈥檚 view.