What value represents refusal speed (VR) for an aircraft?

Refusal speed (VR) for an aircraft is typically defined as the speed at which a pilot must make the decision to reject takeoff and initiate braking, rather than continuing with the takeoff when an engine failure occurs. It is vital because it determines the runway length required for safe stopping in the event of an emergency during takeoff.

The value of 130 knots, as identified in the chosen answer, aligns with the C-17's operational parameters established during training. This speed provides pilots with a specific reference point during takeoff where they can assess their options and act accordingly if something goes wrong with the aircraft’s performance or engine efficiency.

Understanding refusal speed is crucial for ensuring that pilots maintain situational awareness and adhere to safety protocols, enabling them to make informed decisions in critical phases of flight. The other speeds listed may not accurately represent the C-17's established refusal speed, which could lead to insufficient decision-making margins should an emergency arise.