Just like on the flight computer, the ring is aligned with the air temperature and the pressure altitude, allowing the true airspeed (TAS) to be read at the needle. Many airspeed indicator (ASI) instruments have a movable ring built into the face of the instrument that is essentially a subset of the flight computer. In the ground exams for numerous pilot ratings, programmable calculators or calculators containing flight planning software are permitted to be used. The ease of use of electronic calculators means typical flight training literature does not cover the use of calculators or computers at all. The graphic nature of the flight computer also helps in catching many errors which in part explains their continued popularity. This is in part also due to the complex nature of some trigonometric calculations which would be comparably difficult to perform on a conventional scientific calculator. In flight training for a private pilot or instrument rating, mechanical flight computers are still often used to teach the fundamental computations. Manual E6Bs/CRP-1s remain popular with some users and in some environments rather than the electronic ones because they are lighter, smaller, less prone to break, easy to use one-handed, quicker and do not require electrical power. Aviation remains one of the few places that the slide rule is still in widespread use. Extra marks and windows facilitate calculations specifically needed in aviation.Įlectronic versions are also produced, resembling calculators, rather than manual slide rules. One side is used for wind triangle calculations using a rotating scale and a sliding panel. Construction įlight computers are usually made out of aluminum, plastic or cardboard, or combinations of these materials. They are frequently referred to by the nickname "whiz wheel". The back is designed for wind vector solutions, i.e., determining how much the wind is affecting one's speed and course. In the air, the flight computer can be used to calculate ground speed, estimated fuel burn and updated estimated time of arrival. These flight computers are used during flight planning (on the ground before takeoff) to aid in calculating fuel burn, wind correction, time en route, and other items. They are mostly used in flight training, because these flight computers have been replaced with electronic planning tools or software and websites that make these calculations for the pilots.
An E6B flight computer commonly used by student pilots.
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