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accelerated stall
Sinônimos - Inglês
high-speed stall
Definição1
A stall entered during accelerated flight (i.e., during maneuvers). During such maneuvers, when the stalling angle is reached, the aircraft stalls at higher speeds than it would during a normal stall in straight and level flight; the speed is directly proportional to the square root of the applied load factor. For example, an aircraft whose stalling speed during level flight is 150 knots will stall at 300 knots when it is pulled out of a dive with 4 g force. Also known as high-speed stall.
Fonte1
KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
Fonte2
INTERNATIONAL CIVIL AVIATION ORGANIZATION. Aircraft accident digest n.32. Montreal, 1993. (Cir. 232 AN/139).
Nota Adicional1
As common way of inducing stall is to keep pulling up nose, it might be thought all stalls must be accelerated, but in gradual entry flight path may be substantially horizontal. “High-speed stall” is possible in violent manoeuvre because acceleration in vertical plane requires wing to exceed stalling angle of attack. Stall-protection systems are generally designed to respond to rate of change of angle of attack close to stalling angle, so stick-pusher (or whatever form system takes) is fired early enough for critical value not to be reached.
Contexto
The National Transportation Safety Baard determines that the probable cause of the accident was the flightcrew's improper use of flight controls in response to the catastrophic failure bf the right engine during a critical phase of flight, which led to an accelerated stall and loss of control of the airplane.
Subárea
Piloting
Related Term
stall
stall recovery
Français
décrochage en accélération