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Coffin corner
also called Q-Corner is the altitude at or near which an aircraft's stall speed is equal to the critical Mach number

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  1. When an aircraft slows to below its stall speed (or more properly, when the wing exceeds its critical angle of attack), the airflow over the top of the wing separates from the wing surface, and lift decreases dramatically (the wing "stalls")

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
  2. at a given gross weight and G loading

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
  3. At this altitude the aircraft becomes nearly impossible to keep in stable flight

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
  4. Since the stall speed is the minimum speed required to maintain level flight, any reduction in speed will cause the airplane to stall and lose altitude

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
  5. Since the critical Mach number is maximum speed at which air can travel over the wings without losing lift to flow separation and shock waves, any increase in speed will cause the airplane to lose lift, or to pitch heavily nose-down, and lose altitud

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
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