Originally Posted by
Smythe
No, the aircraft pitches up in high AoA and high G manuvers.
Incorrect. The aircraft does not pitch up all by itself. It pitches up because the pilot is pulling back on the yoke. However, the pull forces required were not linear.
The aircraft tends to stall at low speed.
All aircraft tend to stall at low speed. They also stall at high speed if you pull enough g's. No surprises here.
You dont try to modify the wings for stick feel.
Not enough an aero guy to comment except to say that the first response was apparently to add some vortex generators. Does that count as modifying the wing?
MCAS pitches the nose down 2.5 degrees in low speed stall, that is not to make the stick feel the same...it is anti-stall. stick feel is the result, not the cause.
Sorry, but you are misreading all the information that has been published to date. Read the article again. Absolutely no one who is a competent authority has said that MCAS is an anti-stall system, though a number of journalists have mistakenly made this assertion. The issue is the lightening of stick forces as the aircraft approaches the high AOA environment. Quoting from the article:
Engineers determined that on the MAX, the force the pilots feel in the control column as they execute this maneuver would not smoothly and continuously increase. Pilots who pull back forcefully on the column — sometimes called the stick — might suddenly feel a slackening of resistance. An FAA rule requires that the plane handle with smoothly changing stick forces.
Later in same article in reference to low-speed testing:
The flight-test pilots had found another problem: The same lack of smooth stick forces was also occurring in certain low-speed flight conditions.
It is reasonable to debate if MCAS was the appropriate solution to this problem, but the problem had nothing at all to do with aerodynamic stability. Aerodynamic stability has a very specific meaning in aviation. There are many online sites that discuss the topic including
here.