Презентация "Wright brothers"

Wright brothers

Wilbur Wright(August 19, 1871 - January 30, 1948)

Orville Wright(April 16 , 1867 – May 30, 1912)

The Wright brothers were two American aviators, engineers, inventors, and aviation pioneers who are generally credited with inventing, building, and flying the world's first successful airplane. They made the first controlled, sustained flight of a powered, heavier-than-air aircraft on December 17, 1903, In 1904–05 the brothers developed their flying machine into the first practical fixed-wing aircraft.

• The Wright brothers were two of seven children born to Milton Wright (1828–1917), of English and Dutch ancestry, and Susan Catherine Koerner (1831–1889), of German and Swiss ancestry. The other Wright siblings were Reuchlin, Lorin, Katharine, and twins Otis and Ida .
• In elementary school, Orville was given to mischief and was once expelled.
• In 1878 their father, who traveled often as a bishop in the Church of the United Brethren in Christ, brought home a toy helicopter for his two younger sons. The device was based on an invention of French aeronautical pioneer Alphonse Pénaud. Made of paper, bamboo and cork with a rubber band to twirl its rotor, it was about a foot long. Wilbur and Orville played with it until it broke, and then built their own.In later years, they pointed to their experience with the toy as the spark of their interest in flying.
• Both brothers attended high school, but did not receive diplomas.

• Orville dropped out of high school after his junior year to start a printing business in 1889, having designed and built his own printing press with Wilbur's help. Wilbur joined the print shop, and in March the brothers launched a weekly newspaper, the  West Side News . Subsequent issues listed Orville as publisher and Wilbur as editor on the masthead. In April 1890 they converted the paper to a daily,  The Evening Item , but it lasted only four months. They then focused on commercial printing. One of their clients was Orville's friend and classmate, Paul Laurence Dunbar, who rose to international acclaim as a ground-breaking African-American poet and writer. For a brief period the Wrights printed the  Dayton Tattler , a weekly newspaper that Dunbar edited

• Capitalizing on the national bicycle craze (spurred by the invention of the safety bicycle and its substantial advantages over the penny-farthing design), in December 1892 the brothers opened a repair and sales shop (the Wright Cycle Exchange, later the  Wright Cycle Company ) and in 1896 began manufacturing their own brand. They used this endeavor to fund their growing interest in flight. In the early or mid-1890s they saw newspaper or magazine articles and probably photographs of the dramatic glides by Otto Lilienthal in Germany.

• The Wright brothers always presented a unified image to the public, sharing equally in the credit for their invention. Biographers note that Wilbur took the initiative in 1899–1900, writing of "my" machine and "my" plans before Orville became deeply involved when the first person singular became the plural "we" and "our".

• In July 1899 Wilbur put wing warping to the test by building and flying a biplane kite with a five-foot (1.5m) wingspan. When the wings were warped, or twisted, one end of the wings produced more lift and the other end less lift. The unequal lift made the wings tilt, or bank: the end with more lift rose, while the other end dropped, causing a turn in the direction of the lower end. The warping was controlled by four cords attached to the kite, which led to two sticks held by the kite flyer, who tilted them in opposite directions to twist the wings.

• The Wrights based the design of their kite and full-size gliders on work done in the 1890s by other aviation pioneers. They adopted the basic design of the Chanute-Herring biplane hang glider ("double-decker" as the Wrights called it), which flew well in the 1896 experiments near Chicago, and used aeronautical data on lift that Lilienthal had published. The Wrights designed the wings with camber, a curvature of the top surface. The brothers did not discover this principle, but took advantage of it. The better lift of a cambered surface compared to a flat one was first discussed scientifically by Sir George Cayley. Lilienthal, whose work the Wrights carefully studied, used cambered wings in his gliders, proving in flight the advantage over flat surfaces. The wooden uprights between the wings of the Wright glider were braced by wires in their own version of Chanute's modified Pratt truss, a bridge-building design he used for his biplane glider (initially built as a triplane). The Wrights mounted the horizontal elevator in front of the wings rather than behind, apparently believing this feature would help to avoid, or protect them, from a nosedive and crash like the one that killed Lilienthal. Wilbur incorrectly believed a tail was not necessary, and their first two gliders did not have one.

• According to some Wright biographers, Wilbur probably did all the gliding until 1902, perhaps to exercise his authority as older brother and to protect Orville from harm as he did not want to have to explain to Bishop Wright if Orville got injured.

• In 1903 the brothers built the powered Wright Flyer I, using their preferred material for construction, spruce, a strong and lightweight wood, and Pride of the West muslin for surface coverings. They also designed and carved their own wooden propellers, and had a purpose-built gasoline engine fabricated in their bicycle shop. They thought propeller design would be a simple matter and intended to adapt data from shipbuilding. However, their library research disclosed no established formulae for either marine or air propellers, and they found themselves with no sure starting point. They discussed and argued the question, sometimes heatedly, until they concluded that an aeronautical propeller is essentially a wing rotating in the vertical plane.On that basis, they used data from more wind tunnel tests to design their propellers. The finished blades were just over eight feet long, made of three laminations of glued spruce. The Wrights decided on twin "pusher" propellers (counter-rotating to cancel torque), which would act on a greater quantity of air than a single relatively slow propeller and not disturb airflow over the leading edge of the wings.

• The Wright Company was incorporated on November 22, 1909. The brothers sold their patents to the company for $100,000 and also received one-third of the shares in a million dollar stock issue and a 10 percent royalty on every airplane sold.With Wilbur as president and Orville as vice president, the company set up a factory in Dayton and a flying school/test flight field at Huffman Prairie; the headquarters office was in New York City.
• In mid-1910, the Wrights changed the design of the Wright Flyer, moving the horizontal elevator from the front to the back and adding wheels although keeping the skids as part of the undercarriage unit. It had become apparent by then that a rear elevator would make an airplane easier to control, especially as higher speeds grew more common. The new version was designated the "Model B", although the original canard design was never referred to as the "Model A" by the Wrights. However, the U.S. Army Signal Corps which bought the airplane did call it "Wright Type A".

• There were not many customers for airplanes, so in the spring of 1910 the Wrights hired and trained a team of salaried exhibition pilots to show off their machines and win prize money for the company—despite Wilbur's disdain for what he called "the mountebank business". The team debuted at the Indianapolis Speedway on June 13. Before the year was over, pilots Ralph Johnstone and Arch Hoxsey died in air show crashes, and in November 1911 the brothers disbanded the team on which nine men had served (four other former team members died in crashes afterward).
• Between 1910 and 1916 the Wright Brothers Flying School at Huffman Prairie trained 115 pilots who were instructed by Orville and his assistants. Several trainees became famous, including Henry "Hap" Arnold, who rose to Five-Star General, commanded U.S. Army Air Forces in World War II, and became first head of the U.S. Air Force; Calbraith Perry Rodgers, who made the first coast-to-coast flight in 1911 (with many stops and crashes) in a Wright Model EX named the "Vin Fiz" after the sponsor's soft drink; and Eddie Stinson, founder of the Stinson Aircraft Company.

• Neither brother married. Wilbur once quipped that he did not have time for both a wife and an airplane. Following a brief training flight he gave to a German pilot in Berlin in June 1911, Wilbur never flew again. He gradually became occupied with business matters for the Wright Company and dealing with different lawsuits. He became ill on a business trip to Boston in April 1912, the illness sometimes attributed to eating bad shellfish at a banquet. After returning to Dayton in early May 1912, worn down in mind and body, he fell ill again and was diagnosed with typhoid fever. He lingered on, his symptoms relapsing and remitting for many days. Wilbur died, at age 45, at the Wright family home on May 30.

• Orville died on January 30, 1948, over 35 years after his brother, following his second heart attack, having lived from the horse-and-buggy age to the dawn of supersonic flight. Both brothers are buried in the family plot at Woodland Cemetery, Dayton, Ohio. John T. Daniels, the Coast Guardsman who took their famous first flight photo, died the day after Orville.