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Version 1.0
Initial Release November 15, 2020
Last Updated November 15, 2020
File Size 1.50 KB
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#Experimental Exclusive Drag and Drop

About this file

This file contains new Longitude autopilot tuning parameters.  This eliminates the roll channel instability at high altitude.

Adjustments in this first version include:
1. Roll channel (between the flight director roll command and ailerons)..default had way too much gain for the flight dynamics at high altitude/low IAS.
2. Heading mode (loop between heading setpoint and FD roll command), had way too much derivative and was showing derivative kick).
3. Pitch channel (between the flight director pitch command and elev trim).. default was a little slow and could benefit from more gain).

That's all that's modified for now.  I tested at 30,000 from max IAS down to 210, and at 42,000 from barber pole down to 220 IAS.  Stable.  Loop tuning is all about compromise..fast response to changes, but more gain than the system can handle and you introduce instability.  Too slow response and it takes forever to adjust.

I need test pilots now.  Try this tuning parameter set and let me know if it's better or doesn't work in other conditions...on localizer, different loads, gusty winds, etc.  I only tuned the HDG master loop, not the NAV mode, but it seemed like the roll slave loop is where the problem was.

To install:
Put this file (ai.cfg) into your Asobo_Longitude directory, replacing the one that's there. (you can make a backup of the original by renaming it original-ai.cfg or something)...or not..the original values are in there as comments.
For STEAM: C:\Users\[your username]\AppData\Roaming\Microsoft Flight Simulator\Packages\Official\Steam\asobo-aircraft-longitude\SimObjects\Airplanes\Asobo_Longitude.  Yeah they realy bury it in there.

Please comment if it helps you, and if it still is tuned well for other flight conditions.
7 Comments
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    ebiror
    December 15, 2020

    Thank you very much!

    I have tested now in several flights. Also with a difficult, narrow teardrop approache at 170 Kn (Orid LWOH). This works now even in Navmode!

    Without your tuning, I had to use the headingmode and make a bigger radius.

    The place in the official folder is no problem. It's so easy to insert there.

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    M2049
    December 07, 2020

    Finally NAV works now? Because there's no fix around unfortunately

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    DoxyNirox
    December 02, 2020

    Does this mod also fix the high fuel consuption issue ?

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    DesertWolf
    November 16, 2020

    This works very well for me! Thank you so much!

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    genbrien
    November 15, 2020

    thank you for doing what it seems Asobo cant...

    can you touch the fuel load/ fuel burn & rocket powered engines too?

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    Dillon
    November 15, 2020

    I agree, make this mod functional in the Community folder.

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    CPTRoth
    November 15, 2020

    Can you put it in the community folder maybe combined with a repaint? I guess it will be removed with any update otherwise

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