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Coffin corner (also known as the aerodynamic ceiling [1] or Q corner) is the region of flight where a fast but subsonic fixed-wing aircraft's stall speed is near the critical Mach number, making it very difficult to keep an airplane in stable flight. Because the stall speed is the minimum speed required to maintain level flight, any reduction ...
Two of the important technological advancements that arose out of attempts to conquer the sound barrier were the Whitcomb area rule and the supercritical airfoil. A supercritical airfoil is shaped specifically to make the drag-divergence Mach number as high as possible, allowing aircraft to fly with relatively lower drag at high subsonic and ...
Transonic flow patterns on an aircraft wing, showing the effects at and above the critical Mach number. In aerodynamics, the critical Mach number (Mcr or M*) of an aircraft is the lowest Mach number at which the airflow over some point of the aircraft reaches the speed of sound, but does not exceed it. [1]
A coffin corner is characteristically described as the singular point where slowing down causes stall and speeding up causes an exceedance of the mach limit. Descending (into warmer and denser air) at that singular (equivalent) airspeed / mach combination into a flight regime where the stall (equivalent) airspeed is less than the mach limit is ...
Coandă effect; Coaxial-rotor aircraft; Coefficient of moment; Coffin corner (aerodynamics) Coherent turbulent structure; Compressible flow; Compression lift; Computational aeroacoustics; Conductor gallop; Controlled aerodynamic instability phenomena; Cooper–Harper rating scale; Coordinated flight; Crocco's theorem; Crosswind; Curveball ...
In reality, air is compressible and viscous. While the effects of these properties are negligible at low speeds, compressibility effects in particular become increasingly important as airspeed increases. Compressibility (and to a lesser extent viscosity) is of paramount importance at speeds approaching the speed of sound.
Altitude envelope (H-M diagram).Contour is load factor. Turn rate envelope, described in an E-M diagram (doghouse plot). Contour is specific excess power. A doghouse plot generally shows the relation between speed at level flight and altitude, although other variables are also possible.
Coffin corner may refer to: Coffin corner (aerodynamics), an unstable combination of speed and altitude; A position in a bomber formation combat box; Coffin corner (American football), a strategy used by a punter in American football; The Coffin Corner, a magazine published by the Professional Football Researchers Association