What does "V2" refer to during takeoff?

"V2" is defined as the minimum speed required to safely climb after an engine failure during takeoff. This speed is critical because it ensures that the aircraft can maintain a positive rate of climb in the event that one engine goes inoperative shortly after takeoff. V2 provides the necessary margin to ensure controllability and performance under a critical upset condition.

In practical terms, achieving V2 before the aircraft is airborne is vital for safety, as it allows the pilot to maintain control and execute necessary procedures following engine failure. The determination of V2 takes into account factors such as aircraft weight, environmental conditions, and runway length, ensuring that it is tailored to maximize safety during the critical phases of takeoff.