737MAX Stab Trim architecture

[gums]

Salute!
@flyingfalcon

One thing that confuses many folks is that airplanes and the folks in them are operating in a different geometrical/spatial frame of reference than when sitting in a chair in front ot a screen or reading a book. They are also operating in a different dynamic frame of reference, as they are usually moving with the pointy end forward! Heh heh.
So you have to leave your chair behind in the computer room or living room, huh? You have to put yourself in the "aerospace" vehicle and your new frames of reference You have your body coordinates and the Earth's space coordinates. The body coordinates are related to your chair - up/down, left/right and front/back. And motion is along those axis plus rotation about them. The six degrees of freedom we hear about, huh?

Your plane moves your body coordinates within the space coordinates. It's up to you to deal with both if you wanna get someplace or put on a great acro routine. Your "attitude" is your coordinate system's relationship to the space coordinates. It's how people outside see your vehicle. And AoA is related to your velocity vector WRT the air in those space coordinates. So are all the functions of the other appendages of your vehicle .

With a neutral, fixed elevator , changing the AoA of the horizontal stabilizer definitely changes the AoA of the main wing and the whole vehicle. Hell, every fighter and even many civilian planes have no elevator! They use that big stab to control AoA. So maybe you are still in your living room chair reference frame and see the effects of that change in AoA as "attitude".
That's the impression we are getting from your posts. Watch a big plane land and it's obvious that the thing is not "pointing" along its flight path because of its AoA. Nose up attitude, downward flight path.

Gums sends...