When flying an Airplane, What changes the Angle of Attack when an aircraft stalls?

Question

You guys are all wrong. Couch Aviators!!!
Anyone ever hear about CofP and what happens to C of P when an aircraft stalls?
Explain that?

Answer 1

As an aircraft decreases speed, the angle of attack has to go up to make up for the lost lift due to reducing dynamic pressure. If the angle of attack is not increased relative to the horizon, then the airplane will descend, establishing a flight path that will have the required angle of attack relative to the flight path.
As the wing starts stalling, several things occur. First, if the wing has sweepback or twist, some part of the wing will be designed to stall first. The presence of the fuselage, the parasitic drag of the surface finish, the control surface deflection will all contribute to the wing not stalling everywhere at the same time.
In the case of an airplane with sweepback, the wing root will stall first (again, by design, as the incidence built in the wing is higher there). This preserves the lift at the wing tip, keeping the aileron effectivity, but has the additional benefit of pushing the center of lift outboard and to the read (towards the wing tip), creating a moment arm that will tend to reduce the incidence, to naturally recover from the early stage of a stall.
Since on a conventional aircraft (wing in the middle, tail at the rear) the stable design has the center of gravity in front of the wing center of pressure, with what amounts essentially to downforce at the tail, the weight of the airplane will tend to made the plane pitch down when the lift is destroyed by the stall. Aslo, if the wing stalls, the downwash form the wing on the horizontal tail will reduce, and the tail will start having positive lift, wanting to yank the tail back up; and effect that also tries to recover from the stall.

Is this what you had in mind?

Answer 2

1

Answer 3

The CofP does move rapidly rearward during a stall but it alone is not enough to counter the elevator force (if you are holding it up) since it has much more leverage.

What restores the angle of attack is the loss of lift in the wings beyond the stall, this is why the nose pitches down. This is called positive pitch stability.

This same thing happens to the canard on a canard aircraft. The canard will stall first and drop the nose, resulting in an 'unstallable' aircraft.

Answer 4

Yes, the C of P moves aft in a stall, causing the arm from the C of P to the center of gravity to shrink, possibly even putting it behind the center of gravity which does cause the nose to pitch down. But the loss of lift (not complete loss but less than before the stall) also aides in the nose dropping.

Answer 5

Yes, Center of pressure moves, but you must consider also other things..
Horizontal surfaces of the tail(the stabilizer) have usually an angle of attack smaller than the wing, and sometimes negative(because for equilibrium the tail is wanted to give a downward force), this means that when the wing stalls, the horizontal surfaces don't....so there is a momentum that makes the plane to dive
and something similar happens also to sweept-wing because at the tips the angle of attach is smaller than at the roots......

Answer 6

In straight and level flight, the pilot changes the angle of attack buy raising the nose of the airplane. This action may be due to the pilot trying to maintain a constant altitude with the controls.

In a turn, as the radius of the turn decreases, the angle of attack increases as the pilot tries to maintain altitude as g forces in the turn increase. This action can lead to a higher speed stall then the straight and level flight stall.
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Answer 7

Four things:

1. Gravity.

2. Wind resistance.

3. Angle of flight at time of stall.

4. Speed at time of stall.

A lot of math to figure out the specific outcome -but those are your ingredients.

Answer 8

The loss of air speed,which causes loss of lift (under the wings).The lift is what keeps the plane aloft.

Answer 9

The pitch of the aircraft itself????