# Tags

COFFIN CORNER- When the aircraft’s stall speed meets the critical Mach number

In aviation, coffin corner (or Q corner) refers to the point at which the Flight Boundary is defined by when a high incidence stall intersects with that defined by the critical Mach number. Before we dig further, what is stall and what exactly causes it? STALL Stall is defined as a sudden reduction in the lift generated […]