However, during landing and occasionally during take off, the flaps are lowered. This increases the camber giving extra lift. During landing, the flaps also help slow the plane. The third device is a slat, a hinged section neat the front tip of the wing. When the plane slows down, the slats move forward to increase the camber, thereby, increasing the lift.
Speed is the most important element in producing lift.
Speed can be increased by increasing the forward speed of the wing itself as it travels through the air. This causes an even more dramatic change in lift. If you double the speed, you get 4 times the lift. The weight of the object desiring to fly, determines how much lift is necessary. Contributing to this, is whether the object is going up, down, or in level flight.