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The vortex ring state (VRS) is a dangerous aerodynamic condition that may arise in helicopter flight, when a vortex ring system engulfs the rotor, causing severe loss of lift. Often the term settling with power is used as a synonym, e.g., in Australia, the UK, and the US, [2] [3] [4] but not in Canada, which uses the latter term for a different ...
(bottom) vortex ring parachute deployed Project Sense and Destroy Armor , or SADARM , is a United States 'smart' submunition capable of searching for, and destroying tanks within a given target area.
1994 — The United States hosts the FIFA World Cup, which is won by Brazil. 1995 — Oklahoma City bombing kills 168 and wounds 800. The bombing is the worst domestic terrorist incident in U.S. history, and the investigation results in the arrests of Timothy McVeigh and Terry Nichols.
The cartography of the United States is the history of surveying and creation of maps of the United States. Maps of the New World had been produced since the 16th century. The history of cartography of the United States begins in the 18th century, after the declared independence of the original Thirteen Colonies on July 4, 1776 , during the ...
The history of the United States from 1980 until 1991 includes the last year of the Jimmy Carter presidency, eight years of the Ronald Reagan administration, and the first three years of the George H. W. Bush presidency, up to the collapse of the Soviet Union.
A new map released by NASA shows how dramatic temperature changes have gripped the United States and even the world. As parts of the United States faced wind chill temperatures 100 degrees below F ...
Polar vortex US. January is shaping up to be the coldest in a decade as the polar vortex dips south across the eastern half of the United States — shocking a nation that has enjoyed an unusually ...
A major cold blast is in store for more than 30 states as a widespread arctic air outbreak will send nearly every American east of the Rockies into a deep freeze. This will be due to a polar ...