fix:(a32nx/flight model): A320 flight model update #10312
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…lanes/FlyByWire_A320_NEO/flight_model.cfg
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donstim
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Flight Model
Eagle941
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Aug 22, 2025
| drag_scalar = 1 ; Scalar coefficient to ponderate global flap drag coef (non dimensioned) | ||
| pitch_scalar = 1 ; Scalar coefficient to ponderate global flap pitch coef (non dimensioned) | ||
| max_on_ground_position = 5 ; Dynamically set in-tool to last flap-position index by defaut when -1 is found. | ||
| flaps-position.0 = 0.00, -1, 0, 0.0 ; CONF 0 |
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Can you add the description for each comma separated value in the comments?
flap position, airspeed limit, drag scalar, lift scalar, area scalar, add camber, add aft feet, add incidence
donstim
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Fixes auto-rotation issue if light weight, forward CG (e.g., 2900 kg fuel, no passengers, full forward cargo hold.)
This flight model provides approximately equivalent behavior on both MSFS 2020 and 2024. While in MSFS 2024, it came up a couple of knots short of the margin to auto-rotation compared to MSFS 2020, I don't think it is necessary to introduce any changes for the flight model in MSFS 2024 at this point. This flight model will definitely improve what we currently have for 2024.
Summary of Changes
Screenshots (if necessary)
References
Additional context
Developmental testing included tests at the extremes of the gross weight-cg envelope to confirm that nosewheel liftoff with no pitch input does not occur before VR and that the airplane is able to rotate at VR. This testing was done with the clear weather preset and using what are believed to be conservative, but not necessarily the most critical takeoff speeds. This should provide plenty of margin to autorotation when considering that normal loading of fuel and payload through the EFB usually provides a CG in the 32-33% range, well inside the limits.
Known issue: Pitch trim is a bit too high in CONF 2 and CONF 3 at light weights at F speed.
Discord username (if different from GitHub): donbikes
Testing instructions
Perform takeoffs and landings at various weights and cg conditions. Confirm that no auto-rotation occurs before VR and that flight characteristics are not adversely affected.
How to download the PR for QA
Every new commit to this PR will cause new A32NX and A380X artifacts to be created, built, and uploaded.