TFDi_MD-11_QA/xkhofmann-tfdidesign-md11-config-tweaks
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trim better, appr thrust adj

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This commit is contained in:
Kilian Hofmann 2025-02-15 06:50:01 +01:00
parent 0c68b725dd
commit a30fc2d8f0
6 changed files with 125 additions and 66 deletions
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119
MyLayout.ini
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@ -9,8 +9,8 @@ Size=400,400
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@ -47,14 +47,13 @@ Size=159,77
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@ -64,17 +63,21 @@ Size=600,104
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@ -90,8 +93,8 @@ Size=300,210
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[Window][Containers]
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@ -109,10 +112,10 @@ Collapsed=0
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@ -148,28 +151,24 @@ Size=657,302
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[Window][Debug Aircraft Sim Tuning]
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@ -187,8 +186,8 @@ Size=400,800
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[Window][Position##Net Bing position window]
@ -207,9 +206,10 @@ Size=674,110
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@ -228,8 +228,8 @@ Size=428,1026
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[Window][###Scenery Editor]
@ -288,23 +288,19 @@ Collapsed=0
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@ -322,10 +318,9 @@ Size=1255,858
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@ -342,7 +337,7 @@ Collapsed=0
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@ -360,7 +355,7 @@ Size=461,138
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@ -481,6 +476,11 @@ Pos=402,319
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RefScale=16
Column 0 Width=30 Order=0
@ -766,14 +766,17 @@ Column 5 Weight=1.0000
Column 6 Weight=1.0069
Column 7 Weight=1.0069
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Column 1 Weight=1.0000
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1
PackageDefinitions/xkhofmann-tfdidesign-md11-config-tweaks.xml
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@ -29,3 +29,4 @@
</AssetGroup>
</AssetGroups>
</AssetPackage>

12
PackageSources/SimObjects/Airplanes/TFDi_Design_MD-11F_GE/flight_model.cfg
View File

@ -243,7 +243,8 @@ yaw_moment_roll_rate_mach_table = 0:0
elevator_scaling_table = -0.785:0.5, -0.524:0.85, -0.175:0.9, 0:1, 0.175:0.9, 0.524:0.85, 0.785:0.5 ; 0:1
aileron_scaling_table = -0.785:1 ;0:1
rudder_scaling_table = -0.785:0.5, -0.524:0.6, -0.175:0.9, 0:1, 0.175:0.9, 0.524:0.6, 0.785:0.5 ;0:1
elevator_lift_coef=3
//KH From 3
elevator_lift_coef=4
rudder_lift_coef=2
aileron_load_factor_effectiveness_table = 0:1
lift_coef_at_drag_zero = 0.1
@ -284,14 +285,15 @@ ground_crosswind_effect_zero_speed=10
ground_crosswind_effect_max_speed=150
ground_high_speed_steeringwheel_static_friction_scalar=1.5
ground_high_speed_otherwheel_static_friction_scalar=1.2
//KH New ground physics
//KH START New ground physics
ground_new_contact_model_gear_flex=0.0044
ground_new_contact_model_gear_flex_damping=7
ground_new_contact_model_rolling_stickyness=0.25
ground_new_contact_model_rolling_stickyness=0.15
ground_new_contact_model_up_to_speed_lateral=10000
ground_new_contact_model_up_to_speed_lateral_steering=10000
ground_new_contact_model_up_to_speed_longitudinal=10000
enable_high_accuracy_integration=1
//KH END New ground physics
[REFERENCE SPEEDS]
full_flaps_stall_speed = 115
@ -381,7 +383,7 @@ damaging-speed = 250
blowout-speed = 300
maneuvering_flaps = 0
lift_scalar = 0.5
drag_scalar = 0.75
drag_scalar = 0.475
pitch_scalar = 1
max_on_ground_position = 1
flaps-position.0 = 0, -1, 0
@ -396,7 +398,7 @@ damaging-speed = 250
blowout-speed = 300
maneuvering_flaps = 0
lift_scalar = 0.5
drag_scalar = 0.75
drag_scalar = 0.475
pitch_scalar = 1
max_on_ground_position = 1
flaps-position.0 = 0, -1, 0

58
README.MD
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@ -1,3 +1,9 @@
# General
Changes are marked with a comment `//KH` and their respective original value
above the change itself. In cases where the original values were too large or
new sections were added, the changes are enclosed in `//KH START Modified` and
`//KH END Modified` comments.
# Adjustments
- Dropped idle thrust so so that aircraft doesn't start rolling when not nearly
empty
@ -26,14 +32,25 @@
- SDK conformance
- Affected by `fuel_flow_gain`
- Set to zero as the SDK indicated one ought to
- Full AND trim on climb and certain cruise conditions (aft CG, light weight)
- Affected by `elevator_lift_coef`
- Adjusted to increase AND trim effectiveness
- I am unsure if this is truly a fix or my tests lead me astray
- Adjustment is not a complete fix
- Slat drag and approach N1
- Affected by slat drag
- Lowered `drag_scalar`
# Additions
- New ground contact model
# Observations
## General
All test are done at SL (EHAM) and ISA (15C, 1013.25 hPa) unless otherwise
noted.
## Engines
### General
The defined N1 and N2 max values are too low. as per EASA TCDS, the CF6-80C2D1F
has a N1 max of 117.5 and a N2 max of 112.5. I do not know why the lower limits
were chosen, it may be in our interest to adjust this to the actual limits.
@ -68,6 +85,41 @@ altitude remains to low. Adjusting to where high altitude looks reasonable
will produce far too high SL temperatures, going so far as to reach above 1100
degrees Celsius.
# TODO
- AND trim issue
- Slat drag and pitch up moment upon retraction
### Approach N1
A rough formula for 3° approach N1 at F35 is `GW (in metric tonnes) / 10 + 52`.
A MLW aircraft with ~205t would hence require ~72.5 N1. The current N1 is above
80.
## Trim
There have been reports of flights where the aircraft was not able to keep
attitude with full AND trim. In essence, the APT would trim full AND, but the
pitch kept rising. These flights were conducted with differing payloads, all of
which set by the EFB, thus ensuring a valid CG.
Given the MD-11 far back placement of the wing and the subsequent 1° AND vs.
15.5° ANU trim limits, most flights would never use all of the AND trim
authority. There seems to be some issue here.
## Slat drag
Users reported a strong pitch up momentum upon slat retraction, strong enough
at times that sever trim changes were required. This ties in with the Trim
issue noted above, where AND trim authority was not sufficient.
I attribute this to in parts the drag the slats exhibit, the resulting slow
speed increase suddenly shifting to a rather large speed increase hence
requiring large trim inputs. Smoothing out the speed changes would lessen the
effect.
On a more personal side note, I can't see how the slats would create this
amount of drag to begin with.
## Approach attitude
Approach attitude should be (as per Centurion Cargo FCOM):
- F35, CG of 12%
- 2.5°: Body angle of ~6.1°
- 3.0°: Body angle of ~5.6°
- 3.5°: Body angle of ~5.1°
- F35, CG of 34%
- 2.5°: Body angle of ~4.7°
- 3.0°: Body angle of ~4.2°
- 3.5°: Body angle of ~3.9°
No weight is given I assumed MLW of 204.8t.
Current attitude is ~0.5 to 1.5 degrees too low

BIN
References/MD11 throttle bug.xlsx
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1
xkhofmann-tfdidesign-md11-config-tweaks.xml
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@ -8,3 +8,4 @@
</Packages>
<PublishingGroups/>
</Project>