E6B

The E6-B flight computer is a form of circular slide rule used in aviation. It is an analog calculating device still being used in the 21st century. 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. 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. In the air, the flight computer can be used to calculate ground speed, estimated fuel burn and updated estimated time of arrival. The back is designed for wind vector solutions, i.e., determining how much the wind is affecting one's speed and course. They are frequently referred to by the nickname "whiz wheel".

The E6-B flight computer is a form of circular slide rule used in aviation. It is an analog calculating device still being used in the 21st century. 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. 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. In the air, the flight computer can be used to calculate ground speed, estimated fuel burn and updated estimated time of arrival. The back is designed for wind vector solutions, i.e., determining how much the wind is affecting one's speed and course. They are frequently referred to by the nickname "whiz wheel". ===Wind correction angle=== The wind correction angle formula is: \Delta a = \begin{cases} \sin^{-1}\left(\frac {V_\mathrm{w}}{V_\mathrm{a}}\sin(w-d)\right), & \text{in radians;} \\ \frac{180^\circ}{\pi}\sin^{-1}\left(\frac{V_\mathrm{w}}{V_\mathrm{a}}\sin\left(\frac{\pi}{180^\circ}(w-d)\right)\right), & \text{in degrees.} \end{cases} ===True ground speed=== The true ground speed formula is: V_\mathrm{g} = \begin{cases} \sqrt{V_\mathrm{a}^2+V_\mathrm{w}^2-2V_\mathrm{a}V_\mathrm{w}\cos(d - w+\Delta a)}, & \text{in degrees;} \\ \sqrt{V_\mathrm{a}^2 + V_\mathrm{w}^2 - 2V_\mathrm{a}V_\mathrm{w}\cos\left(\frac{\pi}{180^\circ}(d-w+\Delta a)\right)} & \text{in radians.} \end{cases} E6B Intro to the Whiz Wheel

Text derived from https://en.wikipedia.org/w/index.php?oldid=1377011436 under CC BY-SA 4.0; modifications have been made.