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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 ...
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. For the B-47 to cross the Atlantic Ocean, it had to be flown this high.
The aircraft can also fly at up to Mach 1.1 at sea level, but no faster. This outer surface of the curve represents the zero-extra-power condition . All of the area under the curve represents conditions that the plane can fly at with power to spare, for instance, this aircraft can fly at Mach 0.5 at 30,000 feet (9,100 m) while using less than ...
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.
This accelerated air can, and does, reach supersonic speeds, even though the airplane itself may be flying at a subsonic airspeed (Mach number < 1.0). At some extreme angles of attack, in some airplanes, the speed of the air over the top surface of the wing may be double the airplane's airspeed. It is, therefore, entirely possible to have both ...
With Vaughn Gittin Jr. riding shotgun, we take the seven-motor Mach-E 1400 out onto Charlotte Motor Speedway to get a glimpse of the electric Mustang's future.
From January 2008 to June 2009, if you bought shares in companies when Eugene I. Davis joined the board, and sold them when he left, you would have a -61.6 percent return on your investment, compared to a -39.2 percent return from the S&P 500.
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 the only option to get out of the coffin corner. The max altitude line on this aircraft's flight envelope prevents it from having a coffin corner.