Plain English Meaning

A pilot's calculator. One side is a round slide rule for working out things like time, distance, fuel, and airspeed. The other side is a sliding card for figuring out how the wind will push you off course and how much to correct for it.

Full Definition

A handheld mechanical flight computer consisting of a circular slide rule on one side and a wind-correction slide on the other, used by pilots to solve flight planning problems such as time-speed-distance, fuel burn, true airspeed, density altitude, and wind correction angle.

Context Anchor

Seen in flight planning, navigation logs, - , and as a backup when a pilot needs to calculate numbers without relying only on .