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This intersection is the coffin corner, or more formally the Q corner. [3] The above explanation is based on level, constant speed, flight with a given gross weight and load factor of 1.0 G. The specific altitudes and speeds of the coffin corner will differ depending on weight, and the load factor increases caused by banking and pitching maneuvers.
Flight envelope is one of a number of related terms that are used in a similar fashion. It is perhaps the most common term because it is the oldest, first being used in the early days of test flight. It is closely related to more modern terms known as extra power and a doghouse plot which are different ways of describing the flight envelope of ...
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.
Another factor that makes it impossible for some aircraft to reach their absolute ceiling, even with temporary increases in thrust, is the aircraft reaching the "coffin corner". Flight at the absolute ceiling is also not economically advantageous due to the low indicated airspeed which can be sustained: although the true airspeed at an altitude ...
The low speed region of flight is known as the "back of the power curve" or "behind the power curve" [7] [8] (sometimes "back of the drag curve") where more thrust is required to sustain flight at lower speeds. It is an inefficient region of flight because a decrease in speed requires increased thrust and a resultant increase in fuel consumption.
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).
The Airbus A320 was the first commercial aircraft to incorporate full flight-envelope protection into its flight-control software. This was instigated by former Airbus senior vice president for engineering Bernard Ziegler. In the Airbus, the flight envelope protection cannot be overridden completely, although the crew can fly beyond flight ...
At 180 knots (333 km/h; 207 mph) level flight, it could enter a 1.4 g bank turn with the rotor in autorotation, increasing rotor rpm. [5] Airframe stress prevented rotor speed reduction and thus full flight envelope expansion. [5] The XH-59A had high levels of vibration and fuel consumption. [6] [3] The 106-hour test program for the XH-59A ...