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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.
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.
This occurs at the speed where the difference between engine power and the power required to overcome the aircraft's drag is greatest (maximum excess power). [3] 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.
Limited by a top speed of Mach 2.1 and a service ceiling of 18 kilometres (11 mi), the Viggen pilots would line up for a frontal attack, and rely on their state-of-the-art avionics in order to climb at the right time and attain a missile lock on the SR-71.
An aircraft in cruise flight is typically speed stable. If speed increases, drag increases, which will reduce the speed back to equilibrium for its configuration and thrust setting. If speed decreases, drag decreases, and the aircraft will accelerate back to its equilibrium speed where thrust equals drag.
As the aircraft gains altitude the stall speed increases; since the wing is not growing any larger the only way to support the aircraft's weight with less air is to increase speed. While the exact numbers will vary widely from aircraft to aircraft, the nature of this relationship is typically the same; plotted on a graph of speed (x-axis) vs ...
Data from Jane's All the World's Aircraft, 1988–1989 General characteristics Crew: 2 Capacity: 19 passengers Length: 47 ft 1.75 in (14.3701 m) Wingspan: 52 ft 0 in (15.85 m) Height: 17 ft 5.5 in (5.321 m) Wing area: 271 sq ft (25.2 m 2) Airfoil: root: NACA 63A418 ; tip: NACA 63A412 Empty weight: 9,613 lb (4,360 kg) Max takeoff weight: 15,332 lb (6,954 kg) Powerplant: 2 × Garrett TPE331-10UG ...
On 25 July 1973, Aleksandr Fedotov reached 35,230 m (115,600 feet) in a Mikoyan-Gurevich MiG-25M with 1,000 kg payload, and 36,240 m (118,900 feet) with no load (an absolute world record). [ 6 ] [ 7 ] In the thin air, the engines flamed out and the aircraft coasted in a ballistic trajectory by inertia alone.