7 Flight Mystery and Aerodynamic Principles
517
Fig. 7.94 Boeing 787 airliner (large bypass ratio turbofan engine)
Fig. 7.95 Airbus A350 airliner (large bypass ratio turbofan engine)
when the eagle is soaring, the speed is fast, the lift is high, the wing area is
small and the curvature is small. However, when taking off and landing, the
speed is low. Under a certain weight, maintaining the original wing area will
result in a serious lack of lift. For this reason, the eagle actively expands the
feather as much as possible and increases the downward camber to increase
the area of the wing (lift is proportional to area), at the same time increases
the lift by increasing the angle of attack and camber. For the aircraft, it also