Does anyone know the technical purpose for the slats on an aircraft and how they work? Thanks?
Answers:
The slats, along with the flaps, increase the lift of the wing. Remember the old bi-planes and tri-planes? Plenty of wing area, but they didn't fly that fast. high lift =high drag!
To land you want to fly as slow as possible. Once in the air you want as little wing area as possible to increase your speed.
The Bernouli effect is what keeps a plane in the air. Faster moving air has less pressure than slow moving air. A wing has a curve on top and is flat on bottom. When it splits the air, the air on top will move faster than the air on bottom so it can "catch up" and meet back together at the rear of the wing.
Another way of looking at this is it creates a small vacuum on the top of the wing.
The flaps go down at the back of the wing and make it more curved than normal, increasing this effect. The slats are on the front of the wing, increasing the air path distace there. The slats are almost like an extra set of wings "springing up" on the front, almost like a small set of bi-plane wings.
Are you referring to the ailerons? They provide air deflection for landing and take-off purposes. By moving them up or down , lift is changed on the wing causing rise or fall of the aircraft.
slats act the same as flaps do there just on the front of the wing :P
as was said be for it gives more lift
also the other answer up there is wrong ailerons don't make the plane go up and down those are the elevators.this action is referred to as (pitch)
ailerons give the plane (roll) tilt side to side
and the rudder gives the plane the plane (yaw) turning left to right
they move at different angles and perform similar action like the spoilers.
Slats allow the wing to get to a higher angle of attack without stalling. This is the direct reason that more lift is available with slats than without. There is no immediate change in lift with slat deployment like there is with flaps, which someone correctly pointed out, increase the camber of the wing, but also increase the effective incidence angle of the wing on the fuselage.
Slats DECREASE the incidence angle of the wing, not increase it. And camber is not required for lift production, only to prevent a stall at high angles of attack. The 737NG wing is more curved on the bottom than the top when the flaps and slats are retracted.
Air doesn't like turning sharp corners. When it does (like when a wing is at a high angle of attack) the airflow detaches and the wing stalls.
The slats stick down and out from the leading edge of the wing to allow the airflow to change direction (from upwash in front to downwash behind) moe gradually.
Also there is a gap between the slat and the wing when it is extended to allow high pressure air flow through and add energy to the airflow on top of the wing, keeping it from separating. They also add wing area.
Slats can be aerodynamically, hydraulically, or mechanically activated. The 737 has an autoslat system that deploys the slats to prevent stalls automatically (only the slats and not the flaps are deployed since flaps increase incidence angle and could aggravate the stall.
the slats and the flaps increases the wings space to give more lift in low speeds.
The amount of lift generated by a wing depends on the shape of the airfoil, the wing area, and the aircraft velocity.
During takeoff and landing the airplane's velocity is relatively low. To keep the lift high (to avoid objects on the ground!), airplane designers try to increase the wing area and change the airfoil shape by putting some moving parts on the wings' leading and trailing edges. The part on the leading edge is called a slat.
The flaps and slats move along metal tracks built into the wings. Moving the flaps aft (toward the tail) and the slats forward increases the wing area. Pivoting the leading edge of the slat and the trailing edge of the flap downward increases the effective camber of the airfoil, which increases the lift. In addition, the large aft-projected area of the flap increases the drag of the aircraft. This helps the airplane slow down for landing.
Slats work by increasing the camber of the wing, and also by opening a small gap (the slot) between the slat and the wing leading edge, allowing a small amount of high-pressure air from the lower surface to reach the upper surface, where it helps postpone the stall.
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