Читать книгу The Story of American Aviation - Jim Ray - Страница 7

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The idea of human flight has excited man’s imagination for thousands of years. From stories and legends handed down through the years, we know that even from earliest times people dreamed of flying. There are visions of conquering the air in the colorful legends of winged men and beasts found in ancient folklore. The winged statuary of the Egyptians was no doubt inspired by the desire to imitate the flight of birds. In Greek mythology Hermes, the messenger of the gods, is clothed with winged sandals and helmet.

Historians have unearthed stories in cuneiform writing of man’s attempts to fly. Some of these inscriptions date back more than five thousand years, to 3500 B.C. Perhaps the most famous of these stories is the ancient Babylonian tale of the shepherd boy, Etana, who rode on the back of an eagle.

The story of Dædalus and Icarus also tells us that man believed flying was somehow possible. Dædalus was a very clever man who lived with his son Icarus on the Island of Crete. The king of this island requested Dædalus to build a labyrinth or maze for him. Dædalus constructed the labyrinth so cleverly that only the king, who had the clue to the winding passages, could find his way out. One day the king became very angry at Dædalus and threw both him and his son Icarus into the labyrinth, intending that they should perish. Dædalus, who had been dreaming of flying, fashioned wings from wax and feathers, with which he and Icarus could fly to freedom. He cautioned Icarus that he must not fly too high or the sun would melt the wax in his wings. Icarus, impatient to escape, scarcely listened. Like birds the two flew into the air, quickly leaving the walls of the labyrinth. Dædalus, flying low, safely crossed the sea and reached Sicily. Icarus, unfortunately, failed to heed his father’s warning. Flying was so much fun that he rose higher and higher. Suddenly feathers began to drop one by one. Too late Icarus realized that the sun had melted the wax in his wings. Down, down he fell into the sea.

Another ancient myth of flying concerns Pegasus, the winged horse. Bellerophon, a Corinthian hero, rode Pegasus and with his help killed a horrible monster called the Chimera.

Not only did men of long ago dream of flying—some of them firmly believed it could be done. Archimedes, a great Greek mathematician born in 287 B.C., was one. In the year 1250 an Englishman, Roger Bacon, had the idea that a large hollow globe of thin metal could be made which, when filled with an ethereal air or liquid fire, would float on the air like a ship on water.

Leonardo da Vinci, the great Italian artist and scientist, who lived in the fifteenth century, spent years experimenting with the idea of flying. He made a number of sketches of wings to be fitted to the arms and legs of man. His plan for a parachute was soundly worked out and his idea that the wings of a flying machine should be patterned after the wings of the bat found expression in the doped fabric covering of our early airplanes.

Aviation today is such an accepted fact that we sometimes forget how men from different parts of the world had to work, suffer hardships, face ridicule, and even give their lives that flying might become possible.

In 1678, Besnier, a French locksmith, constructed a curious flying machine consisting of two wooden bars which rested on his shoulders. At the ends of the bars he attached muslin wings, arranged to open on the down stroke and close on the up stroke. The wings were operated by moving the arms and legs. Although Besnier failed to realize that no man had sufficient muscular strength to fly as the bird flies, he did sense part of the truth—that gliding with the air currents was possible. During his experiments he is said to have jumped from a window sill, glided over the roof of a near-by cottage, and landed on a barge in the river.

In 1799 an Englishman, George Cayley, conceived the idea that a kite could be built large enough to carry him up into the air. Instead of a string to hold the kite against the wind he decided to use the weight of his own body. He built a huge kite with a sustaining surface of three hundred square feet. When he held on to it and ran against the wind, the kite did indeed lift and carry him some distance through the air. Cayley’s kite was the first glider and also the very beginning of the modern airplane.

Wonderful though it may have seemed to him, no one paid any attention to Cayley’s discovery until 1867, when F. H. Wenham, also an Englishman, came to the conclusion that if a glider were attached to a propeller driven by an engine, it would fly. Wenham was right, of course, but he left his fine logic for other men to use. He did, however, leave something else by which we may remember him. He coined the word aëroplane. He took the Greek aëro, meaning air, and joined to it the Latin planus, meaning flat. The British still use the world aëroplane, but we in America use the simpler form airplane.

The first successful attempt to fly was made in France on June 5, 1783, when the Montgolfier brothers demonstrated their hot-air balloon. It rose to the height of one thousand feet and remained aloft for ten minutes. Benjamin Franklin, then in France, witnessed a flight of the Montgolfier balloon and referred to it in his chronicles. (As this book tells the story of the airplane, we shall not describe in detail the free balloon.)

In Germany, another man interested in flying was experimenting. Otto Lilienthal, in the year 1890, built for himself a queer-looking glider which resembled nothing so much as a bat with huge wings. Remember Leonardo da Vinci’s idea? To his bat wings Lilienthal attached a tail-like rudder for steering. For his own support on the glider he provided a pair of struts similar to the arm rests of crutches. Lilienthal would run down a hill into the wind with his glider. When sufficient speed had been attained, the glider and Lilienthal would rise triumphantly into the air. He learned to travel fair distances and was fired with the ambition to put an engine on his glider. He did design a 2½-horsepower engine, weighing ninety pounds and mounted on a biplane. Before trying his new machine, Lilienthal decided to make a short flight in his old glider. Somehow the glider stalled, one wing dropped off, and the whole thing fell to the ground, carrying Lilienthal to his death. His powered machine was never tried. Other men, however, believed that Lilienthal had been correct in his idea of flying, and his death did not stop their experiments.

About this time in America, a young man, just out of college, built a glider patterned after a sea gull. This young man was a Californian, John J. Montgomery. He worked alone and was so timid that he tried out his glider from a near-by hill at three o’clock in the morning. He was afraid that onlookers would laugh at him if his glider failed. It did not fail. He made a flight of six hundred feet—the first of many successful flights. Montgomery solved many of the problems of flight with little or no funds or encouragement. Because he worked alone and was until recently almost unknown, few written records of his work are available.

All through the nineteenth century men continued their experiments in order to bring to a reality the dream of human flight. With each generation, they moved ever closer to the fringe of the secret but never quite grasped it.

In 1842 an Englishman, W. S. Henson, was optimistic enough to patent his monoplane Ariel for a flight from Britain to India. Though his design had a cambered, or slightly curved, wing, tricycle landing gear, and excellent bracing, it never got beyond the model stage. Another Englishman, John Stringfellow, worked for four years on his steam-driven monoplane. It also did not progress beyond a few model flights. In 1876, a young Frenchman, Alphonse Penaud, read an article that ridiculed man’s presumptuous attempts to fly. This angered the boy and he determined forthwith to conquer the air. Though lack of money balked his ambition, he constructed a number of models which contained many features found in present-day airplanes. Incidentally, Penaud was the first to use an elastic band to propel his model, as boys do. Laurence Hargrave, an American, was the first man to make a study of the cellular or box-kite type of wing construction. He confined his efforts to building models. His ideas influenced the work of Lilienthal, who incorporated them in the powered airplane he was building at the time of his death.