by OE-LML » Sat Nov 24, 2018 12:41 am
Hallo!
Thx for your replies!
Small conclusion (please correct me, if I am wrong):
- Roll axis control of 777 and Airbus-FBW is the same: Generating a roll rate. Once the yoke/sidestick is released to the neutral position, the plane keeps the bank angle.
- Airbus-FBW controlls the pitch by changing vertical acceleration. Once the sidestick is released to neutral, the plane will keep the pitch angle (and is automatically trimmed).
777 controls the pitch by changing the angle of attack and has to be trimmed by the pilot. If the yoke is released to neutral, the plane will nose up/down depending on powersetting and airspeed to which the plane has been trimmed.
But I still got some questions:
What does C* and C*U stand for?
And an example: The 777's pilot (he is flying manually and without autothrottle) wants to climb. He pulls the yoke to achieve a certain pitch angle/AOA and he has to keep it pulled to maintain this attitude (while airspeed is decreasing). The FBW-system initiates the climb by deflecting the elevator. To reduce drag and load of the elevator, FBW aligns it with the stabilizer and therefore it moves the whole stabilizer to keep the plane climbing.
After some time the pilot is getting bored about gaining altitude. He stops pulling and lets the yoke go in neutral position. The 777 has not been trimmed and powersetting was not changed during climb. So the plane will level off and accelerate to the speed it had before.
But how will elevator and stabilizer react??? I guess the elevator will stay aligned with the stab. and stab. will go to the position it had before climbing!? (Pls. tell me if this example is right, and correct me if it is wrong.)
---
Now let's turn to the FG-777:
First of all I really appreciate the work "her" developers and programmers have done over the years.
But one thing that definitively upsets me is the autotrim. Was it added to simulate this described elevator-deflection-reduction to aligned-elevator-stabilizer-movement?
I have almost no knowledge about programming, but some years ago I remember I changed some parameters on the FSX-Beech-Baron to make it fly smoother.
Does anyone know how the FG-777's autotrim function is implemented and is it possible to remove it just by setting some values to 0, or by deleting some lines somewhere???
Alright ... thx in advance for your upcoming replies!
How to fly planes from Everett?? - Just grab them by the yoke.