trim better, appr thrust adj

MyLayout.ini

@@ -9,8 +9,8 @@ Size=400,400
 Collapsed=0
 
 [Window][Console]
-Pos=0,757
+Pos=0,644
-Size=1920,252
+Size=1920,365
 Collapsed=0
 DockId=0x00000007,0
 
@@ -47,14 +47,13 @@ Size=159,77
 Collapsed=0
 
 [Window][Aircraft Selector]
-Pos=0,734
+Pos=1177,533
-Size=1920,252
+Size=735,330
 Collapsed=0
-DockId=0x00000004,1
 
 [Window][###Project Editor:Inspector]
-Pos=0,22
+Pos=0,-1
-Size=700,624
+Size=176,987
 Collapsed=0
 DockId=0x00000001,1
 
@@ -64,17 +63,21 @@ Size=600,104
 Collapsed=0
 
 [Window][###Project Editor]
-Pos=0,22
+Pos=0,-1
-Size=147,733
+Size=176,987
 Collapsed=0
 DockId=0x00000001,0
 
 [Window][###Aircraft Editor]
+ViewportPos=0,23
+ViewportId=0x6DD024AE
 Pos=1106,36
 Size=696,800
 Collapsed=0
 
 [Window][Asset Selector]
+ViewportPos=0,23
+ViewportId=0x0FF1EE57
 Pos=769,135
 Size=400,500
 Collapsed=0
@@ -90,8 +93,8 @@ Size=300,210
 Collapsed=0
 
 [Window][Containers]
-Pos=143,114
+Pos=1204,44
-Size=1373,800
+Size=600,800
 Collapsed=0
 
 [Window][SDK Updates]
@@ -109,10 +112,10 @@ Collapsed=0
 Pos=0,547
 Size=1920,439
 Collapsed=0
-DockId=0x00000005,1
+DockId=0x00000006,1
 
 [Window][FlightObjectsDisplay]
-Pos=691,161
+Pos=691,138
 Size=408,86
 Collapsed=0
 
@@ -148,28 +151,24 @@ Size=657,302
 Collapsed=0
 
 [Window][Debug Aircraft Sim Info]
-ViewportPos=876,458
+Pos=1458,21
-ViewportId=0x3DD03744
+Size=456,376
-Size=942,648
 Collapsed=0
-DockId=0x00000002,2
 
 [Window][Debug Aircraft Sim Curves]
-Pos=131,151
+Pos=19,45
 Size=1286,825
-Collapsed=0
+Collapsed=1
 
 [Window][Debug Aircraft Engines]
-Pos=62,19
+Pos=181,45
-Size=1368,957
+Size=1738,963
-Collapsed=0
+Collapsed=1
 
 [Window][Debug Aircraft Sim Tuning]
-ViewportPos=876,458
+Pos=2,26
-ViewportId=0x3DD03744
+Size=872,966
-Size=942,648
 Collapsed=0
-DockId=0x00000002,3
 
 [Window][Debug Aircraft Weight]
 Pos=486,77
@@ -187,8 +186,8 @@ Size=400,800
 Collapsed=0
 
 [Window][BehaviourDebug]
-Pos=58,59
+Pos=905,19
-Size=1026,595
+Size=547,94
 Collapsed=0
 
 [Window][Position##Net Bing position window]
@@ -207,9 +206,10 @@ Size=674,110
 Collapsed=0
 
 [Window][Wasm Debug]
-Pos=292,76
+Pos=0,621
-Size=1292,814
+Size=1920,365
 Collapsed=0
+DockId=0x00000007,0
 
 [Window][###SDK launch alert]
 Pos=669,183
@@ -228,8 +228,8 @@ Size=428,1026
 Collapsed=0
 
 [Window][Sim]
-Pos=149,22
+Pos=0,-1
-Size=1771,733
+Size=1920,987
 Collapsed=0
 
 [Window][###Scenery Editor]
@@ -288,23 +288,19 @@ Collapsed=0
 
 [Window][Debug Aircraft Tracking]
 ViewportPos=876,458
-ViewportId=0x3DD03744
+ViewportId=0x99C6B087
 Size=942,648
 Collapsed=0
-DockId=0x00000002,0
 
 [Window][Debug Aircraft Data]
-ViewportPos=876,458
+Pos=976,118
-ViewportId=0x3DD03744
+Size=934,628
-Size=942,648
 Collapsed=0
-DockId=0x00000002,1
 
 [Window][Debug Aircraft Speed]
-Pos=3,0
+Pos=3,19
-Size=756,564
+Size=751,324
 Collapsed=0
-DockId=0x00000002,1
 
 [Window][Debug Aircraft Pitch]
 Pos=869,135
@@ -322,10 +318,9 @@ Size=1255,858
 Collapsed=0
 
 [Window][Debug Aircraft Wheels]
-ViewportPos=6,1
+Pos=179,22
-ViewportId=0xAB43E6E2
+Size=722,984
-Size=722,1026
+Collapsed=1
-Collapsed=0
 
 [Window][Debug Weather Sim]
 ViewportPos=148,657
@@ -342,7 +337,7 @@ Collapsed=0
 Pos=0,815
 Size=1920,194
 Collapsed=0
-DockId=0x00000003,2
+DockId=0x8E673552,2
 
 [Window][Exclusion debug]
 Pos=60,60
@@ -360,7 +355,7 @@ Size=461,138
 Collapsed=0
 
 [Window][###Project Editor:Export items]
-Pos=560,204
+Pos=559,181
 Size=800,600
 Collapsed=0
 
@@ -472,7 +467,7 @@ Size=1000,170
 Collapsed=0
 
 [Window][Action StateMachine]
-Pos=112,185
+Pos=112,162
 Size=155,74
 Collapsed=0
 
@@ -481,6 +476,11 @@ Pos=402,319
 Size=562,248
 Collapsed=0
 
+[Window][###Air Traffic Editor]
+Pos=92,146
+Size=400,800
+Collapsed=0
+
 [Table][0xD2BDBE04,5]
 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
 
-[Docking][Data]
+[Table][0x65D5E428,2]
-DockSpace         ID=0x8E673552 Window=0x9A404470 Pos=0,45 Size=1920,987 Split=Y Selected=0x0E7087E1
+RefScale=16
-  DockNode        ID=0x00000006 Parent=0x8E673552 SizeRef=1920,733 Split=Y
+Column 0  Width=150
-    DockNode      ID=0x00000003 Parent=0x00000006 SizeRef=1920,733 Split=X
+Column 1  Weight=1.0000
-      DockNode    ID=0x00000001 Parent=0x00000003 SizeRef=147,987 Selected=0x4D53C840
+
-      DockNode    ID=0x00000002 Parent=0x00000003 SizeRef=1771,987 Split=X
+[Docking][Data]
-        DockNode  ID=0x00000005 Parent=0x00000002 SizeRef=0,0 CentralNode=1 Selected=0x49278EEE
+DockSpace       ID=0x8E673552 Window=0x9A404470 Pos=0,45 Size=1920,987 Split=X Selected=0x0E7087E1
-        DockNode  ID=0x00000008 Parent=0x00000002 SizeRef=821,928 Selected=0xB2CC244E
+  DockNode      ID=0x00000001 Parent=0x8E673552 SizeRef=176,987 Selected=0x4D53C840
-    DockNode      ID=0x00000004 Parent=0x00000006 SizeRef=1920,252 Selected=0xD8501777
+  DockNode      ID=0x00000002 Parent=0x8E673552 SizeRef=1742,987 Split=X
-  DockNode        ID=0x00000007 Parent=0x8E673552 SizeRef=1920,252 Selected=0x49278EEE
+    DockNode    ID=0x00000005 Parent=0x00000002 SizeRef=0,0 Split=Y Selected=0x49278EEE
+      DockNode  ID=0x00000006 Parent=0x00000005 SizeRef=1920,620 CentralNode=1
+      DockNode  ID=0x00000007 Parent=0x00000005 SizeRef=1920,365 Selected=0x49278EEE
+    DockNode    ID=0x00000008 Parent=0x00000002 SizeRef=821,928 Selected=0xB2CC244E
 

PackageDefinitions/xkhofmann-tfdidesign-md11-config-tweaks.xml

@@ -29,3 +29,4 @@
 		</AssetGroup>
 	</AssetGroups>
 </AssetPackage>
+

PackageSources/SimObjects/Airplanes/TFDi_Design_MD-11F_GE/flight_model.cfg

@@ -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

README.MD

@@ -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
+### Approach N1
-- AND trim issue
+A rough formula for 3° approach N1 at F35 is `GW (in metric tonnes) / 10 + 52`.
-- Slat drag and pitch up moment upon retraction
+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

xkhofmann-tfdidesign-md11-config-tweaks.xml

@@ -8,3 +8,4 @@
 	</Packages>
 	<PublishingGroups/>
 </Project>
+