Origin

Two ways to climb.

Every pilot learns two climb speeds early on: Vx and Vy.
You either climb steep and slow, or fast and shallow. The choice is yours.

SAME ALTITUDET+0.00sVx· LESS GROUNDT+3.40sVy· MORE GROUNDT+2.11s
VxBest angle of climbMaximum altitude per unit of ground covered. The steep, short way up — for obstacles, terrain and short fields.
VyBest rate of climbMaximum altitude per unit of time. The fast way up — when you simply want to be high, soon.