Note from the author: Please upvote https://forums.flightsimulator.com/t/workaround-for-missing-propeller-drag-please/368300

This is NOT the official A32NX mod. For the official mod go to https://github.com/flybywiresim/a32nx
This is my flight model mod of flybywire A32NX stable release. By the way: I prefer "livery mods", these are mods that do not include flight_model.cfg, engines.cfg and systems.cfg. But the A32NX team decided to make an "all in one" mod. To change two cfg files, I had to carry the rest of the A32NX mod as ballast around. Sorry for the inconvenience!

Flight model modification version 1.13.16.0, date 2021-02-26:

MSFS 2020 version 1.13.16.0 aka WU3 "tuned" the Asobo flight models from non-realistic to even more non-realistic. I think it was a side effect of "Improved flaps system of aircraft : Aircraft creators can now move the wing surface’s position and camber with each flap system at each flap level", see Release Notes https://store.steampowered.com/news/app/1250410/view/3061854251819296428
Asobo has confessed the flight dynamics bug, see https://forums.flightsimulator.com/t/flight-dynamics-bug-details/368499

The workaround for the "flaps bug" is "go into the flight_model.cfg and divide the flap lift by 2x (there are several possible scalars for that purpose: lift_coef_flaps or lift_scalar)". I apply the "flaps bug workaround" to the airliners because Asobo made it clear that there will be no hotfix: "if we should address this via a hot fix as quickly as possible, but ultimately believe that the better approach is to implement the fix ... (coming early March)".

Additionally I corrected the A320 maximum lift-drag ratio (L/D)max to a more realistic value of 16.3 at level flight without elevator input. The (L/D)max change makes other changes necessary.

To all critics of my work: I am an armchair pilot. If you only accept flight model mods from real life 4-stripes pilots, don't install my mod (Yes, I got a comment from somebody requesting such a disclaimer). Everybody else: Stay happy and healthy!

lift_coef_flaps = 0.7269 ; 1.45380
Apply workaround, see above.

drag_coef_zero_lift = 0.0429 ; 0.02370
Bring (L/D)max to a realistic value.

induced_drag_scalar = 1.5 ; 1
flap_induced_drag_scalar = 1.5 ; 1
"a value between 1.2 and 1.5 is usually fine. If this value is above 1.5, the plane will generate a lot of drag at slow speed. If the value is closer to 1, it will glide very easily at slow speeds." from MSFS SDK/Documentation/01-Getting_Started/Tutorials/02-Flight_model_definition/

thrust_scalar = 0.92 ; 0.82
Set correct cruise speed.

ui_autonomy = 7 ; max duration the aircraft can fly between take-off and landing in (Hrs)
fuel_flow_scalar = 1.28 ; 1 ; Fuel flow scalar
Adjust fuel consumption to ui_autonomy.

wing_incidence = 2 ; Wing incidence (DEGREES)
htail_incidence = 0.75 ; 0 ; Horizontal tail incidence (DEGREES)
Less (auto) trim needed for design cruise speed Vc level flight.

drag_coef_flaps = 0.12 ; 0.15660
[FLAPS.0]
flaps-position.1 = 10, 215, 1 ; 10, 215, 0.25 ; 
flaps-position.2 = 15, 200, 1 ; 15, 200, 0.5 ; 
flaps-position.3 = 20, 185, 1 ; 20, 185, 0.75 ; 
[FLAPS.1]
flaps-position.1 = 18, 215, 1 ; 18, 215, 0.25 ; 
flaps-position.2 = 22, 200, 1 ; 22, 200, 0.5 ; 
flaps-position.3 = 22, 185, 1 ; 22, 185, 0.75 ; 
Redesign flaps drag to have more flaps drag at intermediate flaps settings and less flaps drag in final position.

Note from the author: Please upvote https://forums.flightsimulator.com/t/workaround-for-missing-propeller-drag-please/368300