What is the critical engine-out minimum control speed (Vmcg) on a wet runway?

The critical engine-out minimum control speed (Vmcg) is an essential speed for aircraft operation, particularly during takeoff on wet runways. This speed represents the minimum speed at which the aircraft can maintain directional control with one engine inoperative, which is critical for safety.

In the case of the ERJ 170/175, the Vmcg on a wet runway is specifically defined in the aircraft's operating limitations and is set at 102 KIAS. This value is determined based on aerodynamic characteristics and the performance of the aircraft under specific conditions such as weight and runway surface. Knowing the Vmcg helps pilots ensure that they can safely control the aircraft during critical phases of flight, especially in scenarios where one engine fails during takeoff.

Understanding Vmcg helps pilots recognize when it's safe to continue a takeoff if an engine failure occurs at certain speeds, and it reinforces the importance of achieving and maintaining speeds above this threshold to ensure that control over the aircraft is not compromised.