Plain English Meaning

The speed that gives you the steepest climb -- the most height gained for the least distance covered across the ground. Use it when you need to climb over something close ahead, like trees off the end of a short runway.

Full Definition

The airspeed that produces the greatest gain in altitude per unit of horizontal distance traveled. At VX, the airplane climbs at the steepest possible angle, clearing the most ground obstacles in the shortest forward distance. VX is published in the Pilot's Operating Handbook and varies with airplane weight and configuration.

Context Anchor

You will see VX in takeoff and obstacle- discussions, especially when the airplane must climb away from the without staying for long.