What is a factor considered in creating a Vmc table?

The weight of the aircraft is a crucial factor in creating a Vmc (minimum control speed with the critical engine inoperative) table because it directly affects the aircraft's performance characteristics, particularly its aerodynamic stability and control authority. As the weight of the aircraft changes, the balance between lift and drag also shifts, altering how much control is required to maintain directional stability, especially in a multi-engine environment.

When an aircraft's weight is higher, it may require more control input to maintain level flight, especially when one engine is inoperative. This is because the yawing moment created by the asymmetrical thrust becomes more pronounced at higher weights, which can influence the minimum speed at which the pilot can keep the aircraft under control. The Vmc will generally increase with weight, reflecting the additional control margin needed when responding to an engine failure.

Other factors such as engine type, wing configuration, and flight maneuvers can also influence Vmc, but the weight of the aircraft serves as a foundational parameter in its calculation, making it a primary consideration for safety and operational performance in multi-engine flying.