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Usually the feedback system uses a mass as a "stable reference" and a linkage from the mass operates a flap to adjust the rotor's angle of attack to counter the vibration. Adjustment can be difficult in part because measurement of the vibration is hard, usually requiring sophisticated accelerometers mounted throughout the airframe and gearboxes.
[20] [21] The crash site was discovered on 13 January at about the 5,000-foot (1,500 m) level of Cajon Mountain. 13 January Former Navy pilot, now a test pilot for Douglas Aircraft Company , James B. Verdin , 36, is killed this date when he bails out of A4D Skyhawk , BuNo 137815, at 30,000 feet (9,100 m) during a test flight near Victorville ...
The pilot and the instructor ejected safely at 5,000 feet (1,500 m) and were rescued with only minor injuries by a Sikorsky UH-3 Sea King helicopter. On 5 May 2006, one of this Tomcat's tail-fins was discovered on an isolated beach W of Cork, Ireland, having floated 4,900 miles (7,900 km.) across the Atlantic. This was the sixteenth and last ...
By the end of the year approximately 25,000 communes had been set up, with an average of 5,000 households each. The communes were relatively self-sufficient co-operatives where wages and money were replaced by work points.
Poster by Albert M. Bender, produced by the Illinois WPA Art Project Chicago in 1935 for the CCC CCC boys leaving camp in Lassen National Forest for home. The Civilian Conservation Corps (CCC) was a voluntary government work relief program that ran from 1933 to 1942 in the United States for unemployed, unmarried men ages 18–25 and eventually expanded to ages 17–28. [1]
Foreign internal defense (FID) is a term used by the military in several countries, including the United States, France and the United Kingdom, to describe an integrated or multi-country approach to combating actual or threatened insurgency in a foreign state.
Often the crane will have a degree of automation and be able to unload or stow itself without an operator's instruction. Unlike most cranes, the operator must move around the vehicle to be able to view his load; hence modern cranes may be fitted with a portable cabled or radio-linked control system to supplement the crane-mounted hydraulic ...
The Montana Office of Public Instruction said on August 4 that the school missed AYP for the 2010–2011 school year. [103] However, in August 2011 the state sought and received a waiver from the U.S. Department of Education which kept testing standards static for the 2010–2011 school year rather than raising them, which allowed hundreds of ...