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.

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 install instructions and 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 video https://youtu.be/i_7SjSv5M3Y

Flight model modification version 1.12.13.4:

[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 = 1 ; const
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 = 0.05 ; 0.01 (sailplane), 0.035 (GA plane), 0.05 (aerobatics plane)
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 = 169 ; 150 ; Knots True (KTAS)
thrust_scalar = 2.3 ; 1.1 ; Propeller thrust scalar
After changing the polar, changing of thrust is needed, too. I give the airplane thrust for 169 KIAS maximum level flight airspeed at sea level.

empty_weight_CG_position = 0.61, 0, -0.75 ; 0.45, 0, -0.75 ; Position of airplane empty weight CG relative to reference datum (FEET), z, x, y
Move center of gravity to 25% MAC

empty_weight_pitch_MOI = 1000 ; 650 ; Empty pitch moment of inertia, Jxx (SLUG SQ FEET)
empty_weight_roll_MOI = 50 ; 300 ; Empty roll moment of inertia, Jzz (SLUG SQ FEET)
empty_weight_yaw_MOI = 1000 ; 1183 ; Empty yaw moment of inertia, Jyy (SLUG SQ FEET)
empty_weight_coupled_MOI = 1 ; 10 ; Empty transverse moment of inertia, Jyz (SLUG SQ FEET)
The moments of inertia is small for roll and much higher for the other axis. If the pitch value is too small, you have problems with smooth touch-down. If the roll value is too small, you have problems with winds (gusts) while the airplane is on the ground.

point.0 = 1,  -10.5,  0,   -2.08,  750, 0, 0.523, 90, 0.114, 2, 0.7, 0, 0, 0, 165, 165, 2 ; 1, -10.5, 0, -2.08, 750, 0, 0.523, 33.7, 0.114, 2, 0.7, 0, 0, 0, 165, 165, 2
Give gear tail a steering of 90°.

wing_area = 125 ; Wing area S (SQUARE FEET)
htail_area = 12 ; Horizontal tail area (SQUARE FEET)
vtail_area = 12 ; Vertical tail area (SQUARE FEET)
elevator_area = 12 ; Elevator area (SQUARE FEET)
aileron_area = 125 ; 8 ; (SQUARE FEET)
rudder_area = 12 ; (SQUARE FEET)
aileron_span_outboard = 0.99 ; 0.7 ; (added area) (percentage, non dimensional)
This is the heart of my aerobatics flight model modification: I increase the aileron_area and the aileron_span_outboard control surfaces. The aileron area is equal to the wing area. This artificial change gives fast roll without (much) lag.

elevator_up_limit = 25 ; Elevator max deflection up angle (DEGREES)
elevator_down_limit = 25 ; Elevator max deflection down angle (absolute value) (DEGREES)
aileron_up_limit = 25 ; Aileron max deflection up angle (DEGREES)
aileron_down_limit = 25 ; Aileron max deflection down angle (absolute value) (DEGREES)
rudder_limit = 40 ; 30 ; Rudder max deflection angle (absolute value) (DEGREES)
If enlarging the control surfaces is not enough, I enlarge the maximum deflection angle.

wing_incidence = 0 ; 1 ; Wing incidence (DEGREES)
htail_incidence = 2 ; Horizontal tail incidence (DEGREES)
Adjust for level flight at cruise speed without elevator input.

wing_dihedral = 2 ; 0.5 ; Dihedral angle Lambda (DEGREES)
The wing dihedral determins who much the left wing will go down after you give left rudder. The dihedral therefore increases the snap roll rate. You get roll rate from the aileron and via dihedral from the rudder.

fuselage_length = 16.3 ; 17.8 ; Nose to tail (FEET)
fuselage_diameter = 2.7
fuselage_center_pos = -1.7, 0, 0 ; -2.4, 0, 0
Adjust for good Aircraft Editor, Debug, Sim Forces display.

elevator_trim_neutral = 0 ; 5 ; Elevator trim default angle (absolute value) (DEGREES)
This is a green area in the non-cockpit elevator trim display.

controls_reactivity_scalar = 20 ; 10 ; Make surfaces 10x more reactive on this plane because we can roll up to 10x faster than with regular planes...
I think the parameter controls how fast throttle moves if controlled by Xbox One controller buttons.

cruise_lift_scalar = 1
parasite_drag_scalar = 1
drag_coef_zero_lift = 0.06 ; 0.02840
I control wings lift/drag via [AERODYNAMICS] parameters.

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, rectractable gear or spoilers.

toe_brakes_scale = 0.7 ; 0.5 ; Brake scalar
Have more "brake power".

DisableParkingBrakeControls = 0 ; 1
Enable parking brakes. Note: the real Pitts S2S has no parking brakes. This is for my comfort.