What is the critical angle of attack on a Boeing 747?

Question

What is the critical angle of attack on a Boeing 747?

Answer 1

Check specifically the first site (a) and you will find complete range of flaps usage in a Boeing 747...and contents in the second site (b) are used during simulator training...

Answer 2

Which wing configuration?  Max thrust, idle thrust, or zero thrust?

Answer 3

The critical angle of attack for a great many airfoils falls around 15-20 degrees.

I haven't seen a critical angle of attack documented for the 747 (or most other aircraft) in practice, probably because it's very difficult for a pilot to determine the actual angle of attack while flying.  Instead, pilots rely on knowing that specific combinations of attitude, airspeed, load, etc., are likely to produce excessive angles of attack that may lead to a stall.  For example, pilots know that an airspeed below x with flaps set to y and an aircraft weight of z is likely to produce an excessive angle of attack that will lead to a stall, even though they may not know the actual angle of attack that does this.

Stall theory is interesting in that, fundamentally, the only thing that matters is the angle of attack, and yet in practice, angle of attack is almost never measured or use to predict a stall while in flight.  It's hard to measure, so other variables are used instead, and just knowing what it is at any given instant won't necessarily help you change it unless you know how the angle is produced. For these reasons, a good understanding not only of the fact that angle of attack is all that really matters, but also of the circumstances that can produce excessive angles of attack, is an important part of being a pilot.

Answer 4

That's not something that is readily available to pilots. AOA indicators are  calibrated in relative numbers but for most swept  wing jets its roughly 17-18 degrees.

Answer 5

It is mostly , NOT FULLY same for most planes , in between 15-17 degrees.

Answer 6

First you would have to state several conditions, the size of the plane (was it a shortened version like in Japan Airlines) or a cargo unit, its total loading, air speed/wind speed, etc.

Answer 7

Just like on any airplane, it is the angle between the Chord line of the wing and the relative air flow over the wing, where the wing stops producing lift.