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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.
V x increases with altitude and V Y decreases with altitude until they converge at the airplane's absolute ceiling, the altitude above which the airplane cannot climb in steady flight. The Cessna 172 is a four-seat aircraft. At maximum weight it has a V Y of 75 kn (139 km/h) indicated airspeed [4] providing a rate of climb of 721 ft/min (3.66 m/s).
Service ceiling: 5,500 m (18,000 ft) (absolute ceiling) Rate of climb: 6.32 m/s (1,245 ft/min) Take-off run to 15 m (50 ft): 436 m (1,430 ft)
In a 1984 demonstration of their performance, an English Electric Lightning fighter aircraft used a zoom climb to intercept a Lockheed U-2 cruising at 66,000 ft, above the Lightning's service ceiling of 60,000 feet. Shortly before this, it had even reached 88,000 ft. [9]
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, at a given gross weight and G-force loading. In this region of flight, it is very difficult to keep an airplane in stable flight.
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