Let's evaluate each statement about high-lift devices for their accuracy:
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Flaps are usually only used during landing.
False. While flaps are commonly deployed during landing to increase lift at lower speeds, they are also used during takeoff to enhance lift. -
High-lift devices increase the maximum lift coefficient of the wing.
True. High-lift devices, such as flaps and slats, are designed to increase the maximum lift coefficient (Cl_max) of the wing, allowing the aircraft to generate more lift at slower speeds. -
Slats allow for higher angles of attack without stalling.
True. Slats, which are movable surfaces at the leading edge of the wing, delay flow separation, thus allowing the wing to achieve higher angles of attack before stalling. -
High-lift devices increase the surface area of the wing.
False. High-lift devices do not necessarily increase the actual surface area of the wing. Instead, they modify the wing shape to enhance lift characteristics. -
Slats decrease the total drag of the wing.
False. While slats can improve lift and delay stall, they generally increase drag, particularly at higher angles of attack. The primary function is to enhance lift, not to reduce drag. -
High-lift devices decrease the stall speed of the aircraft.
True. By increasing the lift available at lower speeds, high-lift devices effectively reduce the stall speed of the aircraft.
Summary of True Statements:
- High-lift devices increase the maximum lift coefficient of the wing.
- Slats allow for higher angles of attack without stalling.
- High-lift devices decrease the stall speed of the aircraft.
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