The A.B.C. 鈥楧ragon Fly 1A鈥?is a nine-cylinder radial engine having one overhead inlet and two overhead exhaust valves per cylinder. The cylinder dimensions are 5鈥? inches bore by 6鈥? inches stroke, and the normal rate of speed, 1,650 revolutions per minute, gives 340 horse-power. The oiling is by means of two pumps, the system being practically identical with that of the 鈥榃asp II.鈥?Oil consumption is 鈥?21 pints per brake horse-power per hour, and petrol consumption 鈥?6 pints鈥攖he same as that of the 鈥榃asp II.鈥?The weight of the complete engine, including propeller boss, is 600 lbs., or 1鈥?65 lbs. per horse-power. Stringfellow鈥檚 model triplane, 1868. Chapter 13 Meeting the Competition 五月色婷婷综合开心网 Despite her rustic bluntness, Polly was kind in her way. She made her mistress swallow some wine, and put her slippers on her feet for her, and brought a pillow to place beneath her head. "You see you han't got no strength to spare. You're very weak, missus," she said. Then she muttered as she walked away, "Lord, I wouldn't care to be a lady myself! I think they're mostly poor creeturs." A study of the development of the helicopter principle was published in France in 1868, when the great French engineer Paucton produced his Th茅orie de la Vis d鈥橝rchim茅de. For some inexplicable reason, Paucton was not satisfied with the term 鈥榟elicopter,鈥?but preferred to call it a 鈥榩t茅rophore,鈥?a name which, so far as can be ascertained, has not been adopted by any other writer or investigator. Paucton stated that, since a man is capable of sufficient force to overcome the weight of his own body, it is only necessary to give him a machine which acts on the air 鈥榳ith all the force of which it is capable and at its utmost speed,鈥?and he will then be able to lift himself in the air, just as by the exertion of all his strength he is able to lift himself in water. 鈥業t would seem,鈥?says Paucton, 鈥榯hat in the pt茅rophore, attached vertically to a carriage, the whole built lightly and carefully assembled, he has found something that will give him this result in all perfection. In construction, one would be careful that the machine40 produced the least friction possible, and naturally it ought to produce little, as it would not be at all complicated. The new D?dalus, sitting comfortably in his carriage, would by means of a crank give to the pt茅rophore a suitable circular (or revolving) speed. This single pt茅rophore would lift him vertically, but in order to move horizontally he should be supplied with a tail in the shape of another pt茅rophore. When he wished to stop for a little time, valves fixed firmly across the end of the space between the blades would automatically close the openings through which the air flows, and change the pt茅rophore into an unbroken surface which would resist the flow of air and retard the fall of the machine to a considerable degree.鈥? Mr. Errington is troubled, and I am troubled, and鈥攊n short, it's altogether out of rule.