Which speed is defined as the minimum takeoff safety speed for a safe climb after liftoff?

Which speed is defined as the minimum takeoff safety speed for a safe climb after liftoff?

• A. V1
• B. Vr
• C. V2
• D. Vref

Answer: (C)

Understanding takeoff speeds and what they guarantee. V2 is the speed that ensures a safe climb after liftoff, even if an engine fails. It’s defined as the minimum takeoff safety speed, meaning at or above V2 the aircraft has enough performance to maintain a positive climb gradient and meet obstacle clearance with one engine inoperative. This speed is chosen during certification to provide reliable initial climb performance and controllability after losing power on the critical engine, so you can continue the takeoff safely. In contrast, V1 is the speed at which you decide whether to continue or abort the takeoff, and Vr is the speed at which you rotate to liftoff. Vref is the landing reference speed used for approach and landing, not takeoff. Since V2 specifically addresses safe liftoff climb with an engine out, it is the best answer for the question.

Understanding takeoff speeds and what they guarantee. V2 is the speed that ensures a safe climb after liftoff, even if an engine fails. It’s defined as the minimum takeoff safety speed, meaning at or above V2 the aircraft has enough performance to maintain a positive climb gradient and meet obstacle clearance with one engine inoperative. This speed is chosen during certification to provide reliable initial climb performance and controllability after losing power on the critical engine, so you can continue the takeoff safely.

In contrast, V1 is the speed at which you decide whether to continue or abort the takeoff, and Vr is the speed at which you rotate to liftoff. Vref is the landing reference speed used for approach and landing, not takeoff. Since V2 specifically addresses safe liftoff climb with an engine out, it is the best answer for the question.