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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 ...
A V-n diagram showing V S (stall speed at 1G), V C (corner/maneuver speed) and V D (dive speed) A chart of velocity versus load factor (or V-n diagram) is another way of showing limits of aircraft performance. It shows how much load factor can be safely achieved at different airspeeds. [3]
A flight envelope diagram showing V S (Stall speed at 1G), V C (Corner/Maneuvering speed) and V D (Dive speed) Vg diagram. Note the 1g stall speed, and the Maneuvering Speed (Corner Speed) for both positive and negative g. The maximum “never-exceed” placard dive speeds are determined for smooth air only.
Propeller slipstream reduces the stall speed by energizing the flow over the wings. [26]: 61 Speed definitions vary and include: V S: Stall speed: the speed at which the airplane exhibits those qualities accepted as defining the stall. [26]: 8 V S0: The stall speed or minimum steady flight speed in landing configuration. [27]
The margin between that maximum speed and the stall speed at that altitude was only 10 knots (12 mph; 19 km/h). This narrow window is called the " coffin corner ", [ 42 ] [ 43 ] because breaching either limit was likely to cause airflow separation at the wings or tail. [ 44 ]
A diverted American Airlines flight from Chicago experiencing right engine stall made emergency landing Wednesday night in Columbus without incident.
Also, since the mach limit in the example is well above the stall speed at the 1G flight altitude limit, the described peril of the coffin corner is not very apparent. Many aircraft are able to climb well into their coffin corner region where stall and max become very close, but this aircraft has hundreds of knots of separation between the two.
English: Graph of Speed vs. Altitude for U-2 high-altitude airplane, region depicting Coffin Corner. Stall and Mach limits for one particular gross weight clarified in color. Note that the operational envelope gets narrower if the plane is more heavily loaded.