No. Not always. For many airplanes, it may be required if the airplane is fullly loaded.
The flaps help to increase lift, which is essential to the landing and takeoff phase[s].
Airplane wings are designed to be most efficient when at high altitudes, traveling fast, while providing as little drag as possible. Unfortunately this design inst the best for takeoff and landing. Flaps are used to change the shape of the wing to accommodate takeoff and landing requirements. Most planes have flaps on the front of the wings (leading edge flaps) and at the back of the wings. During takeoff flaps increase lift so a plane can take off with limited runway length and lower speeds. As the plane gains speed the flaps are retracted. On approach and landing you want to fly as slow as possible so the flaps are deployed in increments till landing speed is achieved. Landing slower means less runway needed to stop.
They are useful for takeoff to get lift and at landing for slowing down the plane.
The aircraft would nose-dive ! The flaps are used during flight to help the plane gain or lose height in conjunction with the engines.
Flaps and slatsSlats and flaps
Flaps and stats increase lift for takeoff and slow you down, for landing.
Yes, Flaps are both used to create lift (on takeoff) and to slow the aircraft (on Landing)
yes. the flaps increase drag which slows the plane down.
The flaps, when extended, basically make the wing bigger which generates more lift. during takeoff, it helps to have as much lift as possible to aid the aircraft in it's ascent into the air. during taxiing, there is no real benefit to having the flaps out. the reason the flaps are extended during taxiing is to save time. if the flaps are extended while the plane is taxiing, it doesent have to do it later before it takes off.
Example from a pilot speaking inside a plane: This is American Airways 3953 we are ready for take off over.
The first point is to understand what flaps do. They create more wing surface area when they are extended, therefor creating more lift at slow speeds. TAKEOFF: Depending on the aircraft you are flying, may be a Cessna 170 or a 747, it all depends on the manufacturer of the aircraft. They may say at when you have X weight, you need no flaps but when you have a completely heavier weight, you may need flaps. *do not use this information for real flying.
It helps the plane balance. And on the planes tail it has two flaps on each side, and when these flaps go up it lifts the tail and the plane goes down, and when the flaps go down then then plane goes up.