What is Vmc?

The term Vmc refers to the minimum control speed with the critical engine inoperative. This speed is crucial in multi-engine aircraft operations, as it represents the lowest speed at which the aircraft can maintain controlled flight with one engine failed. Below this speed, the aircraft may not have enough aerodynamic control to counteract the yaw moment caused by the loss of thrust from the inoperative engine.

Understanding Vmc is essential for pilots, as it plays a significant role in safety during engine failure scenarios, particularly during takeoff and climb phases. It helps determine the minimum speed that must be maintained to ensure that the aircraft remains controllable and does not enter into a dangerous yaw or roll situation.