Читать книгу Flight Theory and Aerodynamics - Joseph R. Badick - Страница 85

Leading edge devices are discussed in more depth in Chapter 4; so, only a brief introduction will be presented here. As with trailing edge flaps, leading edge devices like movable slots, leading edge flaps (Krueger flaps), and leading edge cuffs work to increase the C_L over a wing, allowing the aircraft to fly at slower speeds for takeoff and landing. In some cases, the camber of the wing is also increased, which allows for an increase in the angle of attack and increased performance. As with trailing edge flaps, the first setting results in more lift with little increase in drag, while fully deployed settings usually result in mostly drag with little lift.

Figure 3.8 Common flap designs.

Source: U.S. Department of Transportation Federal Aviation Administration (2008a).

Figure 3.9 Ground spoilers deployed.

Source: U.S. Department of Transportation Federal Aviation Administration (2016b).