fix: Move cg further aft (#7691)

* Update CHANGELOG.md * Update flight_model.cfg * Update flight_model.cfg * Update flight_model.cfg * Update A32NX_PayloadManager.js * Update CHANGELOG.md * Update a20nv55.json * Update Payload.tsx
flybywiresim · Jan 11, 2023 · 1e1c416 · 1e1c416
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diff --git a/.github/CHANGELOG.md b/.github/CHANGELOG.md
@@ -24,6 +24,7 @@
 1. [EFB] Show correct runway numbers in landing calculator's runway widget when heading is between 0-5 degrees - @2hwk (2Cas#1022)
 1. [ADIRU/ND/PFD] Initial support for polar navigation - @tracernz (Mike)
 1. [FLIGHTMODEL] Update gear drag - @donstim (donbikes#4084)
+1. [FLIGHT MODEL/EFB] Modified empty weight cg and loading station/fuel tank locations - @donstim (donbikes#4084)
 
 ## 0.9.0
 

diff --git a/flybywire-aircraft-a320-neo/SimObjects/AirPlanes/FlyByWire_A320_NEO/flight_model.cfg b/flybywire-aircraft-a320-neo/SimObjects/AirPlanes/FlyByWire_A320_NEO/flight_model.cfg
@@ -1,9 +1,3 @@
-
-;For future reference:
-; Left/ Right Aux Tanks: 228 total/ 0 unusable USG
-; Left/ Right Main Tanks: 1823.75 total/ 7.75 unusable USG
-; Center Tank: 2185.16 total/ 6.1 unusable USG
-
 [VERSION]
 major = 1
 minor = 0
@@ -12,8 +6,7 @@ minor = 0
 max_gross_weight = 174165 ; Maximum takeoff weight, (LBS)
 empty_weight = 93697 ; Empty weight, (LBS); Includes weight to account for crew, pantry, galleys, lavs, potable water, emergency equipment etc.
 reference_datum_position = 0, 0, 0 ; Position of reference datum relative to FS(0,0,0) (FEET), z, x, y
-; adjust empty weight CG position to ensure 25% MAC at Empty Weight
-empty_weight_CG_position = -8.75, 0, 0 ; Position of airplane empty weight CG relative to reference datum (FEET), z, x, y
+empty_weight_CG_position = -9.42, 0, 0 ; Position of airplane empty weight CG relative to reference datum (FEET), z, x, y 30% CG
 CG_forward_limit = 0.16 ; Gravity center forward limit (longitudinal offset) for longitudinal stability
 CG_aft_limit = 0.4 ; Gravity center after limit (longitudinal offset z) w.r.t reference datum for longitudinal stability (FEET)
 empty_weight_pitch_MOI = 2453714 ; Empty pitch moment of inertia, Jxx (SLUG SQ FEET)
@@ -34,16 +27,16 @@ activate_cg_limit_based_on_mach = 0 ; Activate cg limitation depending on mach v
 ; Passenger baggage weight of 20 kg/pax is also added, making total pax + baggage weight = 104 kg/pax (i.e. Passenger weight on Simbrief)
 ; Starting load is 50% of capacity
 max_number_of_stations = 10 ; Number of payload stations
-station_load.0 = 3300, 21.98, 0, 5, ECONOMY ROWS 1-6 (seats: 36 max: 6670lbs/3024kg), 0
-station_load.1 = 3850, 2.86, 0, 5.1, ECONOMY ROWS 7-13 (seats: 42 max: 7780lb/3530kg), 0
-station_load.2 = 4400, -15.34, 0, 5.3, ECONOMY ROWS 14-21 (seats: 48 max: 8880lb/4032kg), 0
-station_load.3 = 6600, -32.81, 0, 5.5, ECONOMY ROWS 22-29 (seats: 48 max: 8880lb/4032kg), 0
-station_load.4 = 2800, 18.28, 0, 0.9, FWD BAGGAGE/CONTAINER (max: 7500lb/3402kg), 0
-station_load.5 = 1950, -15.96, 0, 1, AFT CONTAINER (max: 5350lb/2426kg), 0
-station_load.6 = 1700, -27.10, 0, 1.2, AFT BAGGAGE (max: 4650lb/2110kg), 0
-station_load.7 = 1300, -37.35, 0, 1.4, AFT BULK/LOOSE (max: 3300lb/1497kg), 0
-station_load.8 = 1, 42.36, 0, 0, PILOT, 1
-station_load.9 = 1, 42.36, 0, 0, CO-PILOT, 2
+station_load.0 = 3300, 20.0, 0, 5, ECONOMY ROWS 1-6 (seats: 36 max: 6670lbs/3024kg), 0
+station_load.1 = 3850, 0.9, 0, 5.1, ECONOMY ROWS 7-13 (seats: 42 max: 7780lb/3530kg), 0
+station_load.2 = 4400, -17.3, 0, 5.3, ECONOMY ROWS 14-21 (seats: 48 max: 8880lb/4032kg), 0
+station_load.3 = 6600, -36.3, 0, 5.5, ECONOMY ROWS 22-29 (seats: 48 max: 8880lb/4032kg), 0
+station_load.4 = 2800, 16.3, 0, 0.9, FWD BAGGAGE/CONTAINER (max: 7500lb/3402kg), 0
+station_load.5 = 1950, -25.1, 0, 1, AFT CONTAINER (max: 5350lb/2426kg), 0
+station_load.6 = 1700, -35.1, 0, 1.2, AFT BAGGAGE (max: 4650lb/2110kg), 0
+station_load.7 = 1300, -44.4, 0, 1.4, AFT BULK/LOOSE (max: 3300lb/1497kg), 0
+station_load.8 = 1, 40.7, 0, 0, PILOT, 1
+station_load.9 = 1, 40.7, 0, 0, CO-PILOT, 2
 
 [CONTACT_POINTS]
 static_pitch = -0.2 ; degrees, pitch when at rest on the ground (+=Up, -=Dn)
@@ -96,11 +89,11 @@ fuel_type = 2 ; 1 = OCTANE 100, 2 = JET_A, 3 = OCTANE 80, 4 = AUTO GAS, 5 = JET
 APU.1 = Name:APU#FuelBurnRate:33
 Engine.1 = Name:LeftEngine#Index:1
 Engine.2 = Name:RightEngine#Index:2
-Tank.1 = Name:Center#Title:TT:MENU.FUEL.CENTER#Capacity:2179#UnusableCapacity:0#Position:-6,0,1#Priority:1#OutputOnlyLines:TankCenterToCenterTankPump1,TankCenterToCenterTankPump2
+Tank.1 = Name:Center#Title:TT:MENU.FUEL.CENTER#Capacity:2179#UnusableCapacity:0#Position:-4.5,0,1#Priority:1#OutputOnlyLines:TankCenterToCenterTankPump1,TankCenterToCenterTankPump2
 Tank.2 = Name:LeftInner#Title:TT:MENU.FUEL.LEFT_INNER#Capacity:1816#UnusableCapacity:0#Position:-8,-13,2#Priority:2#InputOnlyLines:Eng1ToTank2,Xfer1ToTank2,Xfer1ToTank2_2#OutputOnlyLines:TankLeftToLeftTankPump1,TankLeftToLeftTankPump2
 Tank.3 = Name:RightInner#Title:TT:MENU.FUEL.RIGHT_INNER#Capacity:1816#UnusableCapacity:0#Position:-8,13,2#Priority:2#InputOnlyLines:Eng2ToTank3,Xfer2ToTank3,Xfer2ToTank3_2#OutputOnlyLines:TankRightToRightTankPump1,TankRightToRightTankPump2
-Tank.4 = Name:LeftOuter#Title:TT:MENU.FUEL.LEFT_OUTER#Capacity:228#UnusableCapacity:0#Position:-13,-27,3#Priority:3#OutputOnlyLines:Tank4ToXfer1,Tank4ToXfer1_2
-Tank.5 = Name:RightOuter#Title:TT:MENU.FUEL.RIGHT_OUTER#Capacity:228#UnusableCapacity:0#Position:-13,27,3#Priority:3#OutputOnlyLines:Tank5ToXfer2,Tank5ToXfer2_2
+Tank.4 = Name:LeftOuter#Title:TT:MENU.FUEL.LEFT_OUTER#Capacity:228#UnusableCapacity:0#Position:-17.6,-27,3#Priority:3#OutputOnlyLines:Tank4ToXfer1,Tank4ToXfer1_2
+Tank.5 = Name:RightOuter#Title:TT:MENU.FUEL.RIGHT_OUTER#Capacity:228#UnusableCapacity:0#Position:-17.6,27,3#Priority:3#OutputOnlyLines:Tank5ToXfer2,Tank5ToXfer2_2
 Line.1 = Name:TankCenterToCenterTankPump1#Source:Center#Destination:CenterTankPump1
 Line.2 = Name:TankLeftToLeftTankPump1#Source:LeftInner#Destination:LeftInnerTankPump1
 Line.3 = Name:TankRightToRightTankPump1#Source:RightInner#Destination:RightInnerTankPump1

diff --git a/flybywire-aircraft-a320-neo/html_ui/Pages/A32NX_Core/A32NX_PayloadManager.js b/flybywire-aircraft-a320-neo/html_ui/Pages/A32NX_Core/A32NX_PayloadManager.js
@@ -8,7 +8,7 @@ class A32NX_PayloadConstructor {
                 pax: 0,
                 paxTarget: 0,
                 stationIndex: 0 + 1,
-                position: 21.98,
+                position: 20.0,
                 seatsRange: [1, 36],
                 simVar: "A32NX_PAX_TOTAL_ROWS_1_6"
             },
@@ -19,7 +19,7 @@ class A32NX_PayloadConstructor {
                 pax: 0,
                 paxTarget: 0,
                 stationIndex: 1 + 1,
-                position: 2.86,
+                position: 0.9,
                 seatsRange: [37, 78],
                 simVar: "A32NX_PAX_TOTAL_ROWS_7_13"
             },
@@ -30,7 +30,7 @@ class A32NX_PayloadConstructor {
                 pax: 0,
                 paxTarget: 0,
                 stationIndex: 2 + 1,
-                position: -15.34,
+                position: -17.3,
                 seatsRange: [79, 126],
                 simVar: "A32NX_PAX_TOTAL_ROWS_14_21"
             },
@@ -41,7 +41,7 @@ class A32NX_PayloadConstructor {
                 pax: 0,
                 paxTarget: 0,
                 stationIndex: 3 + 1,
-                position: -32.81,
+                position: -36.3,
                 seatsRange: [127, 174],
                 simVar: "A32NX_PAX_TOTAL_ROWS_22_29"
             },
@@ -53,7 +53,7 @@ class A32NX_PayloadConstructor {
                 weight: Math.round(NXUnits.kgToUser(3402)),
                 load: 0,
                 stationIndex: 4 + 1,
-                position: 18.28,
+                position: 16.3,
                 visible: true,
                 simVar: 'A32NX_CARGO_FWD_BAGGAGE_CONTAINER',
             },
@@ -62,7 +62,7 @@ class A32NX_PayloadConstructor {
                 weight: Math.round(NXUnits.kgToUser(2426)),
                 load: 0,
                 stationIndex: 5 + 1,
-                position: -15.96,
+                position: -25.1,
                 visible: true,
                 simVar: 'A32NX_CARGO_AFT_CONTAINER',
             },
@@ -71,7 +71,7 @@ class A32NX_PayloadConstructor {
                 weight: Math.round(NXUnits.kgToUser(2110)),
                 load: 0,
                 stationIndex: 6 + 1,
-                position: -27.10,
+                position: -35.1,
                 visible: true,
                 simVar: 'A32NX_CARGO_AFT_BAGGAGE',
             },
@@ -80,7 +80,7 @@ class A32NX_PayloadConstructor {
                 weight: Math.round(NXUnits.kgToUser(1497)),
                 load: 0,
                 stationIndex: 7 + 1,
-                position: -37.35,
+                position: -44.4,
                 visible: true,
                 simVar: 'A32NX_CARGO_AFT_BULK_LOOSE',
             },
@@ -98,11 +98,11 @@ const MAX_SEAT_AVAILABLE = 174;
      */
 function getZfwcg() {
 
-    const leMacZ = -5.386; // Accurate to 3 decimals, replaces debug weight values
-    const macSize = 13.454; // Accurate to 3 decimals, replaces debug weight values
+    const leMacZ = -5.383; // Accurate to 3 decimals, replaces debug weight values
+    const macSize = 13.464; // Accurate to 3 decimals, replaces debug weight values
 
     const emptyWeight = (SimVar.GetSimVarValue("EMPTY WEIGHT", getUserUnit()));
-    const emptyPosition = -8.75; // Value from flight_model.cfg
+    const emptyPosition = -9.42; // Value from flight_model.cfg
     const emptyMoment = emptyPosition * emptyWeight;
     const PAX_WEIGHT = SimVar.GetSimVarValue("L:A32NX_WB_PER_PAX_WEIGHT", "Number");
 

diff --git a/src/instruments/src/EFB/Ground/Pages/Payload/Loadsheet/a20nv55.json b/src/instruments/src/EFB/Ground/Pages/Payload/Loadsheet/a20nv55.json
@@ -1,9 +1,9 @@
 {
     "specs": {
         "prefix": "A32NX",
-        "emptyPosition": -8.75,
-        "macSize": 13.454,
-        "leMacZ": -5.386,
+        "emptyPosition": -9.42,
+        "macSize": 13.464,
+        "leMacZ": -5.383,
         "weights": {
             "maxZfw": 64300,
             "minZfw": 42500
@@ -288,7 +288,7 @@
             ],
             "index": 0,
             "stationIndex": 1,
-            "position": 21.98,
+            "position": 20.0,
             "fill": 0.19,
             "simVar": "A32NX_PAX_TOTAL_ROWS_1_6"
         },
@@ -606,7 +606,7 @@
             ],
             "index": 1,
             "stationIndex": 2,
-            "position": 2.86,
+            "position": 0.9,
             "fill": 0.25,
             "simVar": "A32NX_PAX_TOTAL_ROWS_7_13"
         },
@@ -968,7 +968,7 @@
             ],
             "index": 2,
             "stationIndex": 3,
-            "position": -15.34,
+            "position": -17.3,
             "fill": 0.28,
             "simVar": "A32NX_PAX_TOTAL_ROWS_14_21"
         },
@@ -1331,7 +1331,7 @@
             "fill": 0.28,
             "index": 3,
             "stationIndex": 4,
-            "position": -32.81,
+            "position": -36.3,
             "simVar": "A32NX_PAX_TOTAL_ROWS_22_29"
         }
     ],
@@ -1341,7 +1341,7 @@
             "weight": 3402,
             "index": 0,
             "stationIndex": 5,
-            "position": 18.28,
+            "position": 16.3,
             "progressBarWidth": 160,
             "simVar": "A32NX_CARGO_FWD_BAGGAGE_CONTAINER"
         },
@@ -1350,7 +1350,7 @@
             "weight": 2426,
             "index": 1,
             "stationIndex": 6,
-            "position": -15.96,
+            "position": -25.1,
             "progressBarWidth": 100,
             "simVar": "A32NX_CARGO_AFT_CONTAINER"
         },
@@ -1359,7 +1359,7 @@
             "weight": 2110,
             "index": 2,
             "stationIndex": 7,
-            "position": -27.1,
+            "position": -35.1,
             "progressBarWidth": 100,
             "simVar": "A32NX_CARGO_AFT_BAGGAGE"
         },
@@ -1368,7 +1368,7 @@
             "weight": 1497,
             "index": 3,
             "stationIndex": 8,
-            "position": -37.35,
+            "position": -44.4,
             "progressBarWidth": 100,
             "simVar": "A32NX_CARGO_AFT_BULK_LOOSE"
         }

diff --git a/src/instruments/src/EFB/Ground/Pages/Payload/Payload.tsx b/src/instruments/src/EFB/Ground/Pages/Payload/Payload.tsx
@@ -519,9 +519,9 @@ export const Payload = () => {
     }, [boardingStarted]);
 
     useEffect(() => {
-        const centerTankMoment = -6;
+        const centerTankMoment = -4.5;
         const innerTankMoment = -8;
-        const outerTankMoment = -13;
+        const outerTankMoment = -17.6;
         // Adjust ZFW CG Values based on payload
         const newZfw = emptyWeight + totalPax * paxWeight + totalCargo;
         const newZfwDesired = emptyWeight + totalPaxDesired * paxWeight + totalCargoDesired;