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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 ...
The service ceiling is the maximum altitude of an aircraft during normal operations. Specifically, it is the density altitude at which flying in a clean configuration , at the best rate of climb airspeed for that altitude and with all engines operating and producing maximum continuous power, will produce a given rate of climb.
The outer edges of the diagram, the envelope, show the possible conditions that the aircraft can reach in straight and level flight. For instance, the aircraft described by the black altitude envelope on the right can fly at altitudes up to about 52,000 feet (16,000 m), at which point the thinner air means it can no longer climb.
The plane was approaching the coffin corner of its flight envelope, when the turbulence was encountered. After that near disaster, the stall mach buffet margins were widened on all jet aircraft, to preclude a plane getting into that situation again, where severe turbulence narrows the "coffin corner" margins so severely that the pilots do not ...
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The max altitude line on this aircraft's flight envelope prevents it from having a coffin corner. However, you can imagine where it would be if you extrapolate the stall line up along its trajectory and do the same for the "top speed" (should read "mach limit") line (ie extend the stall line up and right and extend the mach line straight up).
In philately, an imprinted stamp is a stamp printed onto a piece of postal stationery such as a stamped envelope, postal card, letter sheet, letter card, aerogram or wrapper. [1] The printing may be flat upon the surface of the paper, or embossed with a raised relief. [2] An imprinted stamp is also known as unadhesive stamp [3] or indicium. [1]
Historically, as the aerogram was the least expensive form of international postal communication, users often went to extreme lengths to make best use of the space available including writing in different colours, in different directions, and printing on the sheets minimising font size and margins.