V1 is which of the following?

• A. The minimum speed at which the airplane is able to take off legally.
• B. The maximum speed for safe takeoff.
• C. The recommended speed to continue takeoff after liftoff.
• D. The takeoff decision speed.

Answer: (D)

V1 is the takeoff decision speed. It marks the point on the takeoff roll where you must decide to abort or continue. It’s the maximum speed at which you can safely stop within the remaining runway with the airplane’s performance and braking available. If you reach V1 and something goes wrong, you are committed to continuing the takeoff. Before V1 there’s enough runway to stop, after V1 there isn’t, so you must proceed. This speed isn’t a fixed minimum legal takeoff speed, nor the maximum speed for a safe takeoff, nor the speed you use after liftoff to continue climbing. Rotation happens at a higher speed (VR) and liftoff occurs soon after, with climb speeds like V2 coming into play after takeoff.