Back in 1989, as the Berlin Wall fell, Gunther Holtorf and his wife Christine set out on what was meant to be an 18-month tour of Africa in their Mercedes Benz G Wagen 웹서버 디렉토리 다운로드. Now, with more than 800,000km (500,000 miles) on the clock, Gunther is still going. – BBC News
It’s amazing that this Hypersonic jet was able to travel more than 13,000 mph with heats of over 3,500 degrees.
During flight it experienced shockwaves, 100 times more powerful than expected, which caused it to spin 다운로드. It then righted itself and flew for twice as long before technicians finally aborted the mission.
The full story:
In August the Pentagon’s research arm, known as DARPA, carried out a test flight of an experimental aircraft capable of traveling at 20 times the speed of sound 스팀에서 게임 다운로드.
The arrowhead-shaped unmanned aircraft, dubbed Falcon Hypersonic Technology Vehicle 2, blasted off from Vandenberg Air Force Base, northwest of Santa Barbara, into the upper reaches of the Earth’s atmosphere…then glided above the Pacific at 20 times the speed of sound, or Mach 20 다운로드.
The plan was for the Falcon to speed westward for about 30 minutes before plunging into the ocean near Kwajalein Atoll, about 4,000 miles from Vandenberg 윈드러너 다운로드.
But it was ended about nine minutes into flight for unknown reasons. The launch had received worldwide attention and much fanfare, but officials didn’t provide much information on why the launch failed 다운로드.
The flight successfully demonstrated stable aerodynamically-controlled flight at speeds up to Mach 20 for nearly three minutes 포켓몬고 오토봇 다운로드. Approximately nine minutes into the test flight, the vehicle experienced a series of shocks culminating in an anomaly, which prompted the autonomous flight safety system to use the vehicle’s aerodynamic systems to make a controlled descent and splashdown into the ocean 다운로드.
“The initial shockwave disturbances experienced during second flight, from which the vehicle was able to recover and continue controlled flight, exceeded by more than 100 times what the vehicle was designed to withstand,” said DARPA Acting Director, Kaigham J 다운로드. Gabriel. “That’s a major validation that we’re advancing our understanding of aerodynamic control for hypersonic flight.”
…larger than anticipated portions of the vehicle’s skin peeled from the aerostructure 다운로드. The resulting gaps created strong, impulsive shock waves around the vehicle as it travelled nearly 13,000 miles per hour, causing the vehicle to roll abruptly 다운로드. Based on knowledge gained from the first flight in 2010 and incorporated into the second flight, the vehicle’s aerodynamic stability allowed it to right itself successfully after several shockwave-induced rolls. Eventually, however, the severity of the continued disturbances finally exceeded the vehicle’s ability to recover.
The largest collection of Isaac Newton’s papers has gone digital, committing to open-access posterity the works of one of history’s greatest scientist 체스게임 다운로드.
Among the works shared online by the Cambridge Digital Library are Newton’s own annotated copy of Principia Mathematica and the ‘Waste Book,’ the notebook in which a young Newton worked out the principles of calculus 다운로드.
“Anyone, wherever they are, can see at the click of a mouse how Newton worked and how he went about developing his theories and experiments,” said Grant Young, the library’s digitization manager, in a press release 관전자 데이터를. “Before today, anyone who wanted to see these things had to come to Cambridge. Now we’re bringing Cambridge University Library to the world.”
Approximately 4,000 pages of material are available now, and thousands more will be uploaded in coming months 다운로드.
Cambridge University Library holds the largest and most important collection of the scientific works of Isaac Newton (1642-1727) 래빗스쿨 다운로드. Newton was closely associated with Cambridge. He came to the University as a student in 1661, graduating in 1665, and from 1669 to 1701 he held the Lucasian Chair of Mathematics 철권6 iso 다운로드. Under the regulations for this Chair, Newton was required to deposit copies of his lectures in the University Library.