George de bothezat wikipedia

George de Bothezat, MS 4.

George de Bothezat was born in Petrograd, Russia, Jun 1882, to Alexander and Nadine (Raboutowskaja) de Bothezat. Under contract to the United States Government, he built the "de Bothezat Helicopter," one of the first helicopters in the history of aeronautics to actually perform sustained men-carrying flights.

On 18 Dec 1922, the de Bothezat helicopter, built by the Engineering Division of the Air Service at McCook Field, was successfully test flown for 1 minute 42 seconds.

The 1600kg vehicle, with a 220hp engine, lifted itself to a height of 1.80m and stayed in the air for one minute, 42 seconds. From Jun 1921 to May 1923, de Bothezat was Acting Chief of the Special Research Section, Engineering Division, McCook Field, Dayton, Ohio.

This collection consists of two boxes and the following topics: scholarship written by Dr.

de Bothezat, Helicopter Corporation of America papers, biographical papers, newspaper clippings, photographs, printed materials, technical data, and Baron Vladimir Kuhn von Poushental papers. Clark Special Collections.

George de Bothezat, MS 4. This Russian engineer who had emigrated to the United States started in July 1921 to build a helicopter at Dayton under the auspices of the United States Air Service.

 In his book, Back To Newton, Bothezat gave a critical discussion of the three great cognitive issues, infinity, absolute time, and absolute motion. The most significant part of the collection deals with the first sustained men-carrying helicopter.

The first rotorcraft ordered by the United States Army was made by de Bothezat.

But the US Air Force was more interested in autogyros and blocked funds to de Bothezat, who was thus obliged to give up his experiments. At the ends of the lateral arms, two small propellers with variable pitch were used for thrusting and yaw control.

The helicopter had four six-bladed rotors mounted at the ends of beams 20 metres in length, forming a cross and intersecting in all directions.

Eremeeff, Jeromiejew or Jerome - a millionaire inventor from Long Island and owner of the Massapequa Farmers Market, the 59-year old Jerome was arrested in 1955, freed on $100,000 bond, he jumped bail and disappeared; there were reports he had been seen everywhere from Russia to South America, but he was never found; ?

The majority of the material contains information relative to the training received by de Bothezat and his contributions to science as a lecturer and scientist.

In the late 1930s, de Bothezat built a single seat, coaxial helicopter with even less success. Although the contract called for a 100m hover, the highest it ever reached was about 5m.

The rotor axes were not parallel but slightly inclined inwards so that if prolonged they would have met at a point directly above the centre of gravity. The aircraft weighed 1700kg at take-off and made its first flight in October 1922. The subject was "Isochronism of Time." [ END OF FIRST PARAGRAPH ] - http://select.nytimes.com/gst/abstract.html?res=F70E10FF3959107A93C4A8178AD85F418385F9