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
In the Development update last week they said
"Based on recent feedback from the community about the flaps issue that was introduced in World Update III, we decided to address the issue as quickly as we can and to publish a hotfix next week." and that they are pushing back the next two updates.
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