Plain English Meaning

The speed that gives you the most height gained for the least distance traveled forward. You use it when you need to climb steeply to clear something ahead.

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 relative to the ground, which is useful when terrain or obstacles must be cleared shortly after takeoff. VX is typically slower than VY (best rate of climb airspeed) at sea level, and the two speeds converge with increasing altitude until they meet at the airplane's absolute ceiling.

Context Anchor

Seen in discussions, planning, and the airplane’s operating .