Climb Performance

The ability of an aircraft to gain altitude, expressed as rate of climb (feet per minute) or angle of climb (degrees above horizontal). Climb performance is affected by weight, density altitude, configuration (flaps, gear), wind, and power available. Best rate of climb speed (Vy) provides the most altitude gain per unit of time, while best angle of climb speed (Vx) provides the most altitude gain per unit of horizontal distance. High density altitude, heavy weight, and low power significantly degrade climb performance, which is especially critical during takeoff and obstacle clearance.