How does a air craft lift its weight?

Question

pls tell me

Answer 1

Bernoulli does it ...

the air passing over the wing causes lower pressure above the wing than below the wing, so the plane is sucked up into the low pressure area above the wing ..

Answer 2

An aircraft lift its weight as follows, but before that one needs to understand its construction:

1. The large wings have an aerodynamic shape, called airfoil. The wright brothers were the first to optimize this shape on the basis of several trials at Kittyhawk in US. This shape has a pressure point and an angle which is located at the centre of the wing (width---both LH & RH sides). So when the aircraft is thrusted forward (by means of a turbine engine or propeller engine, then air lifts it (at reaching a particular speed---that's why each aircraft has its own charateristic to behave at certain speeds---some aircraft take off very faster and some some late) acting at this pressure point. At that moment the pressure on the top surface of the wing is zero, due to which the wings lift the aircraft up.

2. Now the weight of the aircraft is balanced in such a way that the above mentioned pressure point (on the wing width) acts like a fulcrum, the axis with respect to which the whole aircraft pitches forward & backwards. That's why the heavier the aircraft from front or back with respect to this point affects the flight charateristics. The rear elevators (near the rudder---which works in conjunction with the front wing ailerons) are used to adjust the flight pitch---i.e. moving its nose forward and upwards.

3. Now, once airborne the following areas come into picture.

a. Thurst---provided by the engines
b. Lift---provided by these airfoils---wings
c. Drag-imposed by the wind, reactive forces from the front (that's why the shape of the airplane is bird like in front to minimize this drag.
d. Gravity---that is free falling apple

These forces are to be balanced so that the aircraft keeps on flying steadily...so, this is the way an aircraft keeps on flying!

Answer 3

I gotta poke fun at Rich.

It's ultimately the pilot in command's responsibility to ensure that the airplane can lift the load. A wise pilot will follow the restrictions placed in the manual for the aircraft to calculate how much can be carried given several factors including weather. The manual's numbers were checked and rewritten when a test pilot (brave soul) goes out and checks the engineers' calculations against reality.

He has to be brave because the engineers are never completely right. Any engineer that doesn't know this, never took a project through to delivery.

Other than that, he is right. :)

And, the nasa link is misleading if not actually wrong. Most aircraft have a tail that actually creates negative lift to keep the nose up. So the tail is actually pushing down, not up.

Answer 4

ignore the above other answers which are either plain wrong, or way too detailed. because of the shape of the wing, the air going over the top of the wing has a lower pressure than the air going past the bottom. the pressure differential, multiplied by the area of the wing, creates a lifting force. engineers, like me, make sure the lifting force exceeds the weight of the aircraft. the rest is just stability and control, but since you only asked about lift, that's your answer.

Answer 5

The power of the engines is determined by the weight and design of the air craft. Aircraft also have the appropriate components built as a part of the fueselage namely elevators and flaps of various kinds which are moved into positions from within the cockpit to create lift.

Answer 6

The shape of an airplane wing is designed to allow the air above the wing to move at a faster rate than the air below the wing. The faster air above creates a sort of vacuum which then allows the greater air presser below the wing to "push" the aircraft into the vacuum above. This is the easiest way to explain it without getting too technical.

Answer 7

The air flowing over the top of the wings speed up causing low pressure area that creates lift so the wing will rise.

Answer 8

The force of the air that the plane runs into on liftoff is enough to raise the plane into the air.

It's like putting your hands out the window of a speeding car.

Answer 9

Weight + Speed =Lift

I forgot the name of the formula. But it has to do with the shape of the fuselage creating a negative space when the airflow goes over it.

Answer 10

the wings of the aircraft are pushed in the downward direction to create a downward thrust which lifts the aircraft same as in the case of a rocket.