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Blobrana


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RE: 1926 North Pole flight
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Title: Byrd's Arctic flight in the context of model atmospheres
Authors: G.H. Newsom

The availability of modern computer models of plausible atmospheric pressure versus altitude for a grid of points over the earth's surface permits a reexamination of Richard Byrd's dead reckoning navigation on his flight in May 1926 from Spitsbergen northwards and his return. Although details of how Byrd converted atmospheric pressure to altitude are ambiguous, the recent atmospheric models probably indicate a small systematic bias that would cause Byrd to overestimate his dead reckoning distance travelled. The same models provide a range of computed winds versus time, altitude, and location, leading to the conclusion that, if Byrd's reported winds during his flight are correct, it was the result of a very unusual and fortuitous circumstance.

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Blobrana


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Rear Admiral Richard Evelyn Byrd, Jr., USN (25 October 1888 - 11 March 1957) was a naval officer who specialised in feats of exploration. 
On 9 May 1926, Byrd and pilot Floyd Bennett attempted a flight over the North Pole in a Fokker F-VII Tri-motor called the Josephine Ford. This flight went from Spitsbergen (Svalbard) and back to its take-off airfield. Byrd claimed to have reached the Pole. This trip earned Byrd widespread acclaim, including being awarded the Medal of Honor and enabled him to secure funding for subsequent attempts to fly over the South Pole.
From 1926 until 1996, there were doubts, defenses, and heated controversy about whether or not Byrd actually reached the North Pole. In 1958 Norwegian-American aviator and explorer Bernt Balchen cast doubt on Byrd's claim on the basis of his extensive personal knowledge of the airplane's speed. In 1971 Balchen speculated that Byrd had simply circled aimlessly while out of sight of land.
The 1996 release of Byrd's diary of the 9 May 1926 flight revealed erased (but still legible) sextant sights that sharply differ with Byrd's later 22 June typewritten official report to the National Geographic Society. Byrd took a sextant reading of the Sun at 7:07:10 GCT. His erased diary record shows the apparent (observed) solar altitude to have been 19°25'30", while his later official typescript reports the same 7:07:10 apparent solar altitude to have been 18°18'18". On the basis of this and other data in the diary, Dennis Rawlins concluded that Byrd steered accurately, and flew about 80% of the distance to the Pole before turning back because of an engine oil leak, but later falsified his official report to support his claim of reaching the pole.
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