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The front of a metal E6-B. The E6-B flight computer is a form of circular slide rule used in aviation. It is an instance of an analog calculating device still being used in the 21st century. An E6-B flight computer commonly used by student pilots.
A flight computer is a form of slide rule used in aviation and one of a very few analog computers in widespread use in the 21st century. Sometimes it is called by the make or model name like E6B, CR, CRP-5 or in German, as the Dreieckrechner. [1] They are mostly used in flight training, but many professional pilots still carry and use flight ...
His first models were designed in the early 1930s, but in 1932 his first version of the E-6B, originally known as the "Dalton Dead Reckoning Computer", came into existence. [ 2 ] On October 30, 1940, Dalton was recalled to active duty and assigned to Naval Air Station Anacostia , across the river from Washington, DC, to help train naval aviators.
The onefold cursor version operates more like the standard slide rule through the appropriate alignment of the scales. The basic advantage of a circular slide rule is that the widest dimension of the tool was reduced by a factor of about 3 (i.e. by π ).
The unknown quantities are read from the chart using the same tools. Alternatively, the E6B flight computer (a circular slide rule with a translucent "wind face" on which to plot the vectors) can be used to graphically solve the wind triangle equations.
TAS is used for flight planning. TAS increases as altitude increases, as air density decreases. TAS may be determined via a flight computer, such as the E6B. Some ASIs have a TAS ring. Alternatively, a rule of thumb is to add 2 percent to the CAS for every 1,000 ft (300 m) of altitude gained. [1]: 8–8, 8–9