Otto Lilienthal

Otto von Lilienthal (1848-1896) was a German pioneer of human aviation who became known as the Glider King. He was the first person to make repeated successful gliding flights. He followed an experimental approach first established earlier in the century by Sir George Cayley. Newspapers and magazines in many countries published photographs of Lilienthal gliding, favorably influencing public and scientific opinion about the possibility of flying machines becoming practical reality after ages of idle fantasy and unscientific tinkering.

Early life

Lilienthal was born 23 May, 1848 in Anklam, Province of Pomerania, the son of Jewish parents. From 1856-1864 he went to the grammer school in Anklam, where he also pursued the study of birds. In his early ages he also studied the movements of the birds together with his brother Gustav. He just loved the idea of flying.Together they built strap-on wings in the hopes of flying, but failed in their attempts. After that he went for 2 years to the regional technical school in Postdam.He become a professional design engineer after a practical training at Schwarzkopf Company in 1866/67. Then he went to the royal technical acadamy in Berlin, which was against his father’s will.From 1867 he started to do experiments on flying.But then he volunteered in the German-French War for one year.After several employments for example Weber Company, he started systemetic experiments on the force of air.For these experiments he moved to Austria where he could jump of the cliffs. On the 6th of November in 1878 he maried Agnes Fischer and in 1883 he founded his own company for boilers and steam engine.In 1889 he published his famous book Birdflight as the basis of aviation.

Career

His greatest contribution was to the development of heavier-than-air flight. He made his glides from an artificial hill he built near Berlin, and also from natural hills, especially in the Rhinow region.

While his lifelong pursuit was flight, he was also an inventor and devised a small engine that worked on a system of tubular boilers. His engine was much safer than the other small engines of the time. This invention gave him the financial freedom to focus on aviation. His brother Gustav (1849-1933) was living in Australia at the time, and Otto did not partake in any aviation experiments until his brother's return in 1885.

A sketch toward a second hang glider in 1891-1892 involved a triangle control frame with a complex basebar that would lead to lower double kingposting while the apex of the triangle would serve as a single kingpost; his filing of a U.S. Patent in 1894 directed pilots to grip the "bar" for carrying and flying the hang glider. The A-frame of Percy Pilcher and Otto Lilienthal echoes in today's control frame for hang gliders and ultralight trike aircraft. Working in conjunction with his brother Gustav, he made over 2,000 flights in gliders of his design starting in 1891 with his first glider version, the Derwitzer, until his death in a gliding crash in 1896.

He could use the updraft of a 10 m/s wind against a hill to remain stationary with respect to the ground. He could shout down to a photographer below to maneuver into the best position for a photo (of which several exist).

Lilienthal did basic research in precisely describing the flight of birds, especially of storks, and used polar diagrams for describing the aerodynamics of their wings. He then made many experiments in an attempt to gather reliable aeronautical data.

His gliders were controlled by changing the centre of gravity by shifting his body, much like modern hang gliders. However they were difficult to manoeuver and had a tendency to pitch down, from which it was difficult to recover. One reason for this was that he held the glider by his shoulders, rather than hanging from it like a modern hang glider. Only his legs and lower body could be moved, which limited the amount of weight shift he could achieve.

Lilienthal made many attempts to improve stability with varying degrees of success. These included making a bi-plane which halved the wing span for a given wing area, and by having a hinged tail plane that could freely move upwards to make the flare at the end of a flight easier. He speculated that flapping wings of birds might be necessary and had begun work on such machines.

Worldwide notice

File:Lilienthalgleiter modelle.jpg

Models of his gliders

Reports of Lilienthal's flights spread both inside and outside Germany, with photographs appearing in scientific and popular publications of many countries. Among the photographers were pioneers such as Ottomar Anschütz and the American physicist Robert Williams Wood.

Lilienthal was a member of the Verein zur Förderung der Luftschifffahrt, and regularly detailed his experiences in his own articles in its journal, the Zeitschrift für Luftschifffahrt und Physik der Atmosphäre, and in the popular weekly publication Prometheus. These were translated in the United States, France and Russia. Many people from around the world came to visit him in Berlin. Among them were Samuel Pierpont Langley from the United States, Nikolai Zhukovsky from Russia, Percy Pilcher from England and Wilhelm Kress from Austria. Zhukovsky wrote that the most important invention in the aviation field was Lilienthal's flying apparatus. Lilienthal corresponded on flight technicalities with many people, among them Octave Chanute, James Means, Alois Wolfmüller and other flight pioneers.

Final flight

On 9 August, 1896, Lilienthal fell from a height of 17 m (56 ft), breaking his spine. He died 10 August, 1896 in Berlin, saying, "Kleine Opfer müssen gebracht werden!" ("Small sacrifices must be made!") and was buried in a distinct grave at Lankwitz public cemetery in Berlin.

Legacy

Lilienthal's work was well known to the Wright brothers, and they credited him as a major inspiration for their decision to pursue manned flight. However, they abandoned his aeronautical data after two seasons of gliding and began using their own wind tunnel data.

File:Lmom.jpg

The Lilienthal monument, Berlin 2006

In September 1909 Orville Wright was in Germany making demonstration flights at Tempelhof aerodrome. In the course of his visit Orville paid a call at the house of Lilienthal's widow and on behalf of himself and Wilbur paid tribute to Mrs Lilienthal for Otto's life and influence in aviation and on the Wright brothers' initial experiments in 1899.

In fiction

• A fictional characterization of Lilienthal was resurrected as an evil clone in the Japanese Read or Die (2001) novels, anime, and manga.
• Lilienthal also played a major part (in absentia) in Theodora Goss's short story "The Wings of Meister Wilhelm," nominated for a World Fantasy Award and published in her anthology In the Forest of Forgetting.
• Lilienthal's great grandson appears in the Spanish short story, "El Sueño de Otto."
• H.G. Wells in his 1897/1898 science-fiction story The War of the Worlds, near the end of chapter 2, book 2, refers to "our Lilienthal soaring machines," the context being that this and other human technology of the day is rudimentary when compared to the story's fictitiously invading Martians’.
• H.G. Wells mentioned Lilienthal at the beginning of Chapter XVI of "When the Sleeper Wakes" (1899), calling him "the aerial proto-martyr". The reference is missing from the revised later edition entitled "The Sleeper Wakes" (1910).
• Lilienthal appears momentarily as an idol for the main character, Conor, in Eoin Colfer's Airman.
• Lilienthal is mentioned in Edward D. Hoch's short story "The Flying Man".

Gallery

• More otho flying.JPG
• Lilienthal in flight.jpg

See also

• Aviation history#Picking up the pace
• George Cayley
• Jean-Marie Le Bris
• John Joseph Montgomery
• Triangle control frame Otto Lilienthal's sketch for his second glider included the foundations of the triangle control frame that would become variously formatted as a key subassembly for almost all hang gliders of the future.
• German inventors and discoverers

References

• Lilienthal, Otto (1911). Birdflight as the Basis of Aviation. reprinted 2001: ISBN 0-938716-58-1 (Translation from German edition, Berlin 1889: Der Vogelflug als Grundlage der Fliegekunst reprinted 2003: ISBN 3-9809023-8-2
• Crouch, Tom D (1989). The Bishop's Boys: A Life of Wilbur and Orville Wright. W. W. Norton & Company. ISBN 039330695X
• Encyclopaedia Judaica, art. "Lilienthal, Otto"

External links

Wikiquote has a collection of quotations related to:

Otto Lilienthal

Wikimedia Commons has media related to:

Otto Lilienthal

• Lilienthal Museum
• Lilienthal's appendix From Chanute's book Progress in Flying Machines 1893.
• Movies and simulations
• Lukasch, H. D. (2009, August 3). Otto Lilienthal Museum. Retrieved 1997, from Biographie of Otto Lilienthal: http://www.lilienthal-museum.de
• Otto Lilienthal. (n.d.). Retrieved 2009, from Otto Lilienthal Biography: http://www.answers.com/topic/otto-lilienthal
• Otto Lilienthal Biography ( 1848- 1896). (n.d.). Retrieved 2009, from www.madehow.com: http://www.madehow.com/inventorbios/29/Otto-Lilienthal.html
• ToKen1@technologist.com. (n.d.). Otto Lilienthal. Retrieved 2009, from www.prodigy.net: http://pages.prodigy.net/token1/lilien1.htm

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