What is go speed (VGO) when refusal speed (VR) is 130 kts, rotation speed (VROT) is 125 kts, and maximum brake energy speed (VBMAX) is 135 kts?

To determine the go speed (VGO) in the context provided, it's important to understand the definitions and applications of the various speeds involved during takeoff.

Go speed (VGO) is the minimum speed at which the aircraft can continue the takeoff safely after an engine failure at or above this speed. It is typically set at or above the rotation speed (VROT) but below the refusal speed (VR), which is the speed at which the aircraft can no longer safely stop on the runway, regardless of any exceptional conditions.

Given the values:

• Refusal speed (VR) is 130 knots

• Rotation speed (VROT) is 125 knots

• Maximum brake energy speed (VBMAX) is 135 knots

The go speed must be aligned with safe operational limits, and in this case, it would be set at rotation speed (VROT), which is 125 knots. This speed ensures that the aircraft is capable of taking off (and thus achieving flight) after any potential engine failure up to that point.

Therefore, the correct identification of go speed as 125 knots allows for a safe margin above the minimum airspeed required to begin the takeoff while being below the point where the aircraft can no longer safely stop if