GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Asymmetrical lateral control at a near stall angles of attack
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Decreased lift In the urea of installation at high angles
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Asymmetrical lateral control at low angles of attack.
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None of the above
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Detailed explanation-1: -Stall strips are usually located near the inboard leading edge area of the wing. Their purpose being (supposedly) to cause the inboard area of the wing to begin to stall first. This, theoretically, provides a more gradual stall and enables the ailerons to be effective longer.
Detailed explanation-2: -At an angle of attack of approximately 18° to 20° (for most wings), turbulence over the upper wing surface decreases lift so drastically that flight can not be sustained and the wing stalls.
Detailed explanation-3: -A stall strip initiates flow separation on a region of the upper surface of the wing during flight at high angle of attack. This is typically to avoid a tendency to spin following a stall, or to improve the controllability of the airplane as it approaches the stall.
Detailed explanation-4: -Designed as small airfoils, winglets reduce the aerodynamic drag associated with vortices that develop at the wingtips as the airplane moves through the air. By reducing wingtip drag, fuel consumption goes down and range is extended.