On every airline takeoff, the pilot monitoring calls out three speeds: "V1… Rotate… V2." Each call marks a decision or an action that has been calculated before the aircraft even leaves the gate. Here is what V1, VR and V2 mean and why they matter.
Why takeoff speeds are calculated for every flight
Takeoff speeds are not fixed numbers. They are worked out for each departure from the aircraft's weight, flap setting, runway length and slope, wind, temperature, pressure altitude and runway condition. The crew enters them into the flight management system and sets speed bugs before takeoff. That way the critical decisions are already made before the aircraft starts rolling.
V1: takeoff decision speed
V1 is the maximum speed by which the pilot must take the first action to reject the takeoff (throttles closed, brakes applied) and still stop within the accelerate-stop distance available. It is also the minimum speed from which the takeoff can be continued after an engine failure and still reach 35 ft above the runway within the takeoff distance available.
- Before V1: a serious problem such as engine failure or fire means reject the takeoff.
- After V1: the aircraft is committed. The crew continues the takeoff and deals with the problem in the air, because there is not enough runway left to stop safely.
That is why many airlines move the captain's hand off the thrust levers at the V1 call: the decision has been made.
VR: rotation speed
VR is the speed at which the pilot begins raising the nose to lift off. It is chosen so that, rotating at the normal rate, the aircraft reaches V2 by 35 ft even if an engine has failed. VR can never be lower than V1. Rotating too early can strike the tail on the runway or increase drag; rotating late uses up runway.
V2: takeoff safety speed
V2 is the minimum speed the aircraft must reach by 35 ft above the runway with one engine inoperative. It guarantees the required climb gradient and controllability on the remaining engine(s). By certification rules it has a margin above both the stall speed and the minimum control speed in the air (VMCA). After an engine failure, pilots fly V2 (or the speed the aircraft manufacturer specifies) until reaching the acceleration altitude.
Watch: V1, VR and V2 in 60 seconds
How the speeds relate
- V1 is never lower than VMCG (minimum control speed on the ground) and never higher than VR.
- V1 ≤ VR < V2.
- On a short, wet or contaminated runway, V1 is often reduced so that the aircraft can still stop if the takeoff is rejected.
- When the accelerate-stop distance equals the takeoff distance, the result is called a balanced field length.
Why this matters for your DGCA exams
Takeoff performance appears in DGCA Technical General and Performance papers, and interviewers at airlines expect cadets to explain the V1 decision clearly. Learn the definitions word-perfect, then make sure you understand why each speed exists. Next, read about the critical engine, which explains why engine failure after V1 is such a demanding scenario.
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