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The top-right boundary of the envelope is the curve representing critical Mach number in true airspeed terms, which decreases as altitude increases. These curves typically intersect at some altitude higher than the maximum permitted altitude for the aircraft. This intersection is the coffin corner, or more formally the Q corner. [3]
In aerodynamics, the flight envelope, service envelope, or performance envelope of an aircraft or spacecraft refers to the capabilities of a design in terms of airspeed and load factor or atmospheric density, often simplified to altitude. [1] [2] The term is somewhat loosely applied, and can also refer to other measurements such as maneuverability.
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. In aviation, the maneuvering speed of an aircraft is an airspeed limitation at which the full deflection of the controls can be made at without risking ...
At the top of the B-47's envelope, about 35,000 feet (11,000 m), it was in "coffin corner". [49] That means that at this level, which produced the most range at most weights due to fuel consumption, there was an envelope of 5 kn (9.3 km/h) between maximum mach and stall speed.
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] For most of the time on a typical mission the U-2 was flying less than five knots (6 mph; 9 km/h) above stall speed.
The one-engine inoperative (OEI) service ceiling of a twin-engine, fixed-wing aircraft is the density altitude at which flying in a clean configuration, at the best rate of climb airspeed for that altitude with one engine producing maximum continuous power and the other engine shut down (and if it has a propeller, the propeller is feathered ...
A fixed-wing aircraft can be made to stall in any pitch attitude or bank angle or at any airspeed but deliberate stalling is commonly practiced by reducing the speed to the unaccelerated stall speed, at a safe altitude. Unaccelerated (1g) stall speed varies on different fixed-wing aircraft and is represented by colour codes on the airspeed ...
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