light aircraft, usually full power is used during takeoff. Large
transport category (airliner) aircraft may use a
reduced power for takeoff, where less than full power is applied in order to prolong engine life, reduce maintenance costs and reduce noise emissions. In some emergency cases, the power used can then be increased to increase the aircraft's performance. Before takeoff, the engines, particularly
piston engines, are routinely run up at high power to check for engine-related problems. The aircraft is permitted to accelerate to rotation speed (often referred to as Vr). The term
rotation is used because the aircraft pivots around the axis of its main
landing gear while still on the ground, usually because of manipulation of the
flight controls to make this change in
The nose is raised to a nominal 5
°–15° nose up
pitch attitude to increase lift from the
wings and effect liftoff. For most aircraft, attempting a takeoff without a pitch-up would require cruise speeds while still on the runway.
Fixed-wing aircraft designed for high-speed operation (such as commercial
jet aircraft) have difficulty generating enough lift at the low speeds encountered during takeoff. These are therefore fitted with
high-lift devices, often including
slats and usually
flaps, which increase the
camber and often area of the wing, making it more effective at low speed, thus creating more lift. These are deployed from the wing before takeoff, and retracted during the climb. They can also be deployed at other times, such as before landing.
The speeds needed for takeoff are relative to the motion of the air (
indicated airspeed). A
headwind will reduce the ground speed needed for takeoff, as there is a greater flow of air over the wings. Typical takeoff air speeds for jetliners are in the 130–155
knot range (150–180 mph, 240–285 km/h). Light aircraft, such as a
Cessna 150, take off at around 55 knots (63 mph, 100 km/h).
Ultralights have even lower takeoff speeds. For a given aircraft, the takeoff speed is usually dependent on the aircraft weight; the heavier the weight, the greater the speed needed.
 Some aircraft are specifically designed for
short takeoff and landing (STOL), which they achieve by becoming airborne at very low speeds.
The takeoff speed required varies with
air density, aircraft gross weight, and aircraft configuration (flap or slat position, as applicable). Air density is affected by factors such as field elevation and air
temperature. This relationship between temperature,
altitude, and air density can be expressed as a
density altitude, or the altitude in the
International Standard Atmosphere at which the air density would be equal to the actual air density.
Operations with transport category aircraft employ the concept of the takeoff
V-Speeds, V1, VR and V2. These speeds are determined not only by the above factors affecting takeoff performance, but also by the length and slope of the runway and any peculiar conditions, such as obstacles off the end of the runway. Below V1, in case of critical failures, the takeoff should be aborted; above V1 the pilot continues the takeoff and returns for landing. After the co-pilot calls V1, he/she will call VR or "rotate," marking speed at which to rotate the aircraft. The VR for transport category aircraft is calculated such as to allow the aircraft to reach the regulatory screen height at V2 with one engine failed. Then, V2 (the safe takeoff speed) is called. This speed must be maintained after an engine failure to meet performance targets for rate of climb and angle of climb.
In a single-engine or light twin-engine aircraft, the pilot calculates the length of runway required to take off and clear any obstacles, to ensure sufficient runway to use for takeoff. A safety margin can be added to provide the option to stop on the runway in case of a
rejected takeoff. In most such aircraft, any engine failure results in a rejected takeoff as a matter of course, since even overrunning the end of the runway is preferable to lifting off with insufficient power to maintain flight.
If an obstacle needs to be cleared, the pilot climbs at the speed for maximum climb angle (Vx), which results in the greatest altitude gain per unit of horizontal distance travelled. If no obstacle needs to be cleared, or after an obstacle is cleared, the pilot can accelerate to the best rate of climb speed (Vy), where the aircraft will gain the most altitude in the least amount of time. Generally speaking, Vx is a lower speed than Vy, and requires a higher pitch attitude to achieve. Normally ground speed for takeoff varies between 250 km/h to 475 km/h.
Tow line and towing aircraft seen from the cockpit of a
Assisted takeoff is any system for helping
aircraft into the air (as opposed to strictly under its own power). The reason it might be needed is due to the aircraft's weight exceeding the normal
maximum takeoff weight, insufficient power, or the available
runway length may be insufficient, or a
hot and high airfield, or a combination of all four factors. Assisted takeoff is also required for
gliders, which do not have an engine and so are unable to take off by themselves.