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

This mod does not need "Flight dynamics bug" workaround.

Please check out ring and phylon race mods from thokio and Jacob at
https://flightsim.to/file/8803/airrace-spielberg-austria-redbull-type
https://flightsim.to/file/7950/airrace-new-york
https://flightsim.to/file/7487/grand-canyon-airrace
https://flightsim.to/file/2703/grand-canyon-racing-course

This is no livery, this is a flight model mod. The idea is to make the flight behavior more realistic. One important detail is a realistic glide ratio of 1:5,4. Now you can flare your airplane before touch-down.
See http://www.andreadrian.de/FS_2020_sailplanes/ for more of my work for MSFS 2020:
Gliders: SG-38, Aircreations 582SL
Sailplanes: DG-808S, Ka 6E, ASK23
Trainer: Tiger Moth
Seaplane: Grumman Goose G21A
Warbirds: Fokker Dr1, North American P-51D
See Youtube videos https://youtu.be/siRfDWePNqE , https://youtu.be/HE-1hyqK11Q and https://youtu.be/mM-X0VXHZ30

Flight model modification version 1.12.13.5:

The Extra 330LT is my showcase airplane. I try to show that MSFS 2020 is the BEST simulator for aerobatics. Unfortunately the download figures of Extra 330LT are small. DOWNLOAD this file and try AEROBATICS. I think this is fun!

The NASA book "Quest for Performance: The Evolution of Modern Aircraft" has no data about the 330LT. I can measure Asobo flight model maximum lift-drag ratio (L/D)max with the MSFS 2020 build-in DevMode tool Aircraft Editor, Debug, Sim Polar VhVs. The Asobo 330LT has (L/D)max of 10.3. I think this large (L/D)max is one reason for the "floating above the runway at landing" complaints about Asobo flight models. Therefore I set 330LT (L/D)max to 6.8.
MSFS 2020 uses the parameters drag_coef_zero_lift and parasite_drag_scalar to set zero-lift drag coefficient CD,0. The flight model uses drag_coef_zero_lift * parasite_drag_scalar, that is drag_coef_zero_lift=0.0688, parasite_drag_scalar=1 and drag_coef_zero_lift=0.0277, parasite_drag_scalar=2.48 produce the same (L/D)max value.
MSFS 2020 has no propeller drag and no ground effects. As workaround I use larger (L/D)max at the airplanes that have no retractable gear and/or flaps.

[AIRPLANE_GEOMETRY]
wing_incidence = 0 ; const
oswald_efficiency_factor = 0.77 ; const
htail_incidence = 2 ; const

[FLIGHT_TUNING]
cruise_lift_scalar = 1 ; const
parasite_drag_scalar = 2.48 ; zero-lift drag coefficient  parameter 1
induced_drag_scalar = 1.5 ; 1.2 (sailplane, low power airplane) to 1.5 (piston, turboprop)
flap_induced_drag_scalar = 1.5 ; see induced_drag_scalar
pitch_stability = 0.04 ; const
roll_stability = 0.04 ; const
yaw_stability = 0.04 ; const

[AERODYNAMICS]
drag_coef_zero_lift = 0.02770 ; zero-lift drag coefficient parameter 2
compute_aero_center = 0 ; const
aero_center_lift = 0 ; const
lift_coef_at_drag_zero = 0.1 ; const
lift_coef_at_drag_zero_flaps = 0.1 ; const

cruise_speed = 205 ; 150 ; Knots True (KTAS)
thrust_scalar = 3.00 ; 1 ; Propeller thrust scalar
wing_incidence = 0 ; 1 ; Wing incidence (DEGREES)
htail_incidence = 1.4 ; 2 ; Horizontal tail incidence (DEGREES)
After changing the zero-lift drag coefficient, adjusting the thrust is needed. I give the airplane thrust for 205 kts maximum level flight airspeed at sea level. The wing_incidence to htail_incidence difference influences the needed thrust_scalar because the elevator effect on drag_coef_zero_lift is too exaggerated in MSFS 2020.

empty_weight_CG_position = 0.54, 0, 0 ; 0.85, 0, 0 ; Position of airplane empty weight CG relative to reference datum (FEET), z, x, y
Move center of gravity to 25% MAC

wing_dihedral = 2.8 ; 0.7 ; Dihedral angle Lambda (DEGREES)
Left rudder SHALL put left wing down. This fixes the Asobo model.

aileron_up_limit = 60 ; 30 ; Aileron max deflection  angle (DEGREES)
aileron_down_limit = 60 ; 30 ; Aileron max deflection down angle (absolute value) (DEGREES)
aileron_span_outboard = 0.99 ; 0.7
aileron_effectiveness = 1 ; 2
This is the heart of my aerobatics airplane mod. The effectiveness parameters add inertia. Therefore I increase the control surfaces and/or the maximum angle.

elevator_up_limit = 43 ; 26 ; Elevator max deflection up angle (DEGREES)
elevator_down_limit = 43 ; 26 ; Elevator max deflection down angle (absolute value) (DEGREES)
More elevator for better spin.

rudder_limit = 45 ; 30 ; Rudder max deflection angle (absolute value) (DEGREES)
More rudder for better knife edge flight. Do snap rolls at airspeeds below 120 kts.

elevator_trim_neutral = 0 ; 4 ; Elevator trim max angle (absolute value) (DEGREES), for indicators only (no influence on flight model)
This is a green area in the non-cockpit elevator trim display.

lift_coef_flaps = 0.00000
lift_coef_spoilers = 0.00000
drag_coef_flaps = 0.00000
drag_coef_gear = 0 ; 0.00500
drag_coef_spoilers = 0.00000
Airplane has no flaps, no rectractable gear and no spoilers.