Climb (or Climb-out)

Climb-out is the phase of flight immediately following take-off, from the point the aircraft becomes airborne until it reaches the initial cruise altitude or the altitude at which the first power reduction is made. It is characterized by high power settings, positive rate of climb, and configuration changes (flap retraction, landing gear retraction).

Standard Climb Speeds

• V_X (Best Angle of Climb): Provides the most altitude gain per unit of horizontal distance; used when obstacle clearance is the priority
• V_Y (Best Rate of Climb): Provides the most altitude gain per unit of time; used for normal climb to cruise altitude
• V_YSE (Best Single-Engine Rate of Climb): Used after engine failure on a multi-engine aircraft

Engine Cooling During Climb

Piston engines run hotter during climb due to high power and reduced airspeed (less cooling airflow). Cylinder head temperature (CHT) and oil temperature must be monitored. If temperatures approach limits, reduce power, increase airspeed, or use carburettor heat as appropriate.

Related Terms

See also: Best Angle of Climb, Best Rate of Climb.