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IRIS Bombardier Global Express for FS2004 2026-10-14
- Thread starter anels9
- Start date
ScottishMike1
Members +
Thanks Sbob, I played around with those values to try to get the nose wheel to sit just right, but getting all the other flight factors as correct as I could took precedence. It was the .air file that was causing the overstress so I borrowed the air file from the converted to fly AI Global express model.
Together we can get this bird flying right. It was difficult to get it to handle sweetly on the ground and take off but also able to happily fly at Mach 0.9 at 40,000 ft.
Together we can get this bird flying right. It was difficult to get it to handle sweetly on the ground and take off but also able to happily fly at Mach 0.9 at 40,000 ft.
scotty
Members +
I am experiencing the following issues:
The GEX sways significantly from side to side when cornering on the ground (even when lightly loaded), and it also pitches forward abruptly when braking.
Does it make sense to start by adjusting the following values in the aircraft.cfg?
"Static compression", max/Static compression ratio", "damping ratio" and "empty_weight_roll_moi".
The GEX sways significantly from side to side when cornering on the ground (even when lightly loaded), and it also pitches forward abruptly when braking.
Does it make sense to start by adjusting the following values in the aircraft.cfg?
"Static compression", max/Static compression ratio", "damping ratio" and "empty_weight_roll_moi".
ScottishMike1
Members +
The major point that needs work is the Centre of gravity moving dependent on the fuel load. I did play around with the fuel tank positions trying to get them all at the 0,0 CG position, this may seem like cheating, but I am sure the real aircraft will have computerised fuel management so this is our FS9 management equivalent.
The problem:
CG with low fuel 6.5% :
And with almost full tanks 96.5% :
The range is almost correct with current settings (around 6500 nmi). I did two or three test runs from Genoa (Italy) to Edinburgh (Scotland) a distance of approx 1000 nm.
Stability is not bad, on autopilot (straight and level) at normal speeds is good. At 4X normal speed some flutter and vibration can occur, strangely at 16X speed it is stable again.
The wings dip a bit when taxing round corners but this will be easily corrected with the contact point adjustment.
So some work still to be done.
The problem:
CG with low fuel 6.5% :
And with almost full tanks 96.5% :
The range is almost correct with current settings (around 6500 nmi). I did two or three test runs from Genoa (Italy) to Edinburgh (Scotland) a distance of approx 1000 nm.
Stability is not bad, on autopilot (straight and level) at normal speeds is good. At 4X normal speed some flutter and vibration can occur, strangely at 16X speed it is stable again.
The wings dip a bit when taxing round corners but this will be easily corrected with the contact point adjustment.
So some work still to be done.
Motormouse
SOH-CM-2025
Urgh thats worse; its a Vision flight deck ( which has Collins Avionics btw) populated
with the older Honeywell Primus 2000 Avionics that microsoft made for the Learjet 45
The vision system incorporates such things as synthetic vision system, obstacle awareness
Infra red camera display
Ttfn
Pete
Motormouse
SOH-CM-2025
[QUOTE="ScottishMike1]
The wings dip a bit when taxing round corners but this will be easily corrected with the contact point adjustment.
So some work still to be done.
[/QUOTE]
The real one does that too; try and turn quick taxi-ing and you can scrape a wngtip, Oh and you can also scrape wintips on take off or landing by having too much pitch attitude
Ttfn
Pete
The wings dip a bit when taxing round corners but this will be easily corrected with the contact point adjustment.
So some work still to be done.
[/QUOTE]
The real one does that too; try and turn quick taxi-ing and you can scrape a wngtip, Oh and you can also scrape wintips on take off or landing by having too much pitch attitude
Ttfn
Pete
Sbob
SOH-CM-2026
The (manual) pitch settings are a little skittish. This is for SMike's dynamics upgrade, BTW.
On the one hand, like I said, the trim changes make big differences for a large biz jet.
On the other hand, you're going to fly this thing using the auto pilot 90% of the time, and the A/P is just fine.
I have the eyepoint really close to where it should be. No more parking near a terminal and having it disappear because your POV is now inside the building. That means the current position of the nose gear is off by many feet (X direction) which will throw off the turn radius when you're on the ground. Since I have [contact points] "kind of" dialed in based on the "long" nose gear location, changing the X axis nose gear position will screw up the nose gear elevation again, but this fine. This is how I nail the actual contact points, anyway.
As far as this thing handling like a BMW or a Porsche when its on the ground- that ain't going to happen.
If you try to set the nose wheel steering to 40 degrees while you're taxing at 30 kts, it gonna roll.
Let me make some more adjustments and I'll post them in this thread once I'm finished. SMike has what I consider to be some solid flight dynamics (in the air). We just need to tame some of the ground handling.
I just wish this thing had a VC.
On the one hand, like I said, the trim changes make big differences for a large biz jet.
On the other hand, you're going to fly this thing using the auto pilot 90% of the time, and the A/P is just fine.
I have the eyepoint really close to where it should be. No more parking near a terminal and having it disappear because your POV is now inside the building. That means the current position of the nose gear is off by many feet (X direction) which will throw off the turn radius when you're on the ground. Since I have [contact points] "kind of" dialed in based on the "long" nose gear location, changing the X axis nose gear position will screw up the nose gear elevation again, but this fine. This is how I nail the actual contact points, anyway.
As far as this thing handling like a BMW or a Porsche when its on the ground- that ain't going to happen.
If you try to set the nose wheel steering to 40 degrees while you're taxing at 30 kts, it gonna roll.
Let me make some more adjustments and I'll post them in this thread once I'm finished. SMike has what I consider to be some solid flight dynamics (in the air). We just need to tame some of the ground handling.
I just wish this thing had a VC.
scotty
Members +
After some experimentation, the following values yield the best result. (I tested with a 30% tank level each time.)
Swaying and pitching (during rolling and braking) have been completely eliminated, and the contact points fit perfectly.
roll_MOI: Increased from just under 188,000 to 1,150,000.
Pitch_MOI: Increased from 363,000 to 1,650,000.
Suspension Damping (point.0 bis .2): The ratio (Max/Static Ratio) has been reduced from 2.5 to 2.3 (preventing the suspension from bottoming out as easily), and the damping ratio has been increased to 0.75 and 0.80, respectively, so that the nose settles smoothly after braking rather than collapsing abruptly.
[contact_points]
point.0=1, -23.63, 0.00, -7.3, 1600, 0, 0.5625, 69.8, 0.35, 2.3, 0.75, 10.0, 10.0, 0, 260.0, 260.0
point.1=1, -63.43, -6.76, -7.9, 1600, 1, 1.0, 0.0, 0.55, 2.3, 0.80, 9.0, 9.0, 2, 260.0, 260.0
point.2=1, -63.43, 6.76, -7.9, 1600, 2, 1.0, 0.0, 0.55, 2.3, 0.80, 9.0
static_pitch = -1.8
static_cg_height = 7.3
gear_system_type=1 //Hydraulic
emergency_extension_type=2 //None=0,Pump=1,Gravity=2
[WEIGHT_AND_BALANCE]
max_gross_weight = 99500 // (pounds)
empty_weight = 52230 // (pounds)
reference_datum_position = 55.35, 0, 0 // (feet) distance from FlightSim Reference position, which is: (1/4 chord, centerline, waterline)
empty_weight_CG_position = -56.0, 0, 7 // (feet) longitudinal, lateral,
max_number_of_stations = 50
station_load.0 = 170, -8.67, -1.4, 0.0 // Weight(lbs), longitudinal, lateral, vertical positions from datum (feet)
station_load.1 = 170, -8.67, 1.4, 0.0 // Weight(lbs), longitudinal, lateral, vertical positions from datum (feet)
station_load.2 = 2500, -62.0, 0.0, 0.0 // Weight(lbs), longitudinal, late
station_name.0 = "Pilot"
station_name.1 = "Co-Pilot"
station_name.2 = "Passengers"
;Moments of Inertia
empty_weight_pitch_MOI = 1650000
empty_weight_roll_MOI = 1150000
empty_weight_yaw_MOI = 1850000
empty_weight_coupled_MOI = 0.0
The moments of inertia (MOI) values entered are appropriate for a light Learjet, but far too low for a heavy Global Express.
It is as if the aircraft, while on the ground, has the physical weight of a truck but the inertia of a feather—which causes it to sway excessively when cornering.
Swaying and pitching (during rolling and braking) have been completely eliminated, and the contact points fit perfectly.
roll_MOI: Increased from just under 188,000 to 1,150,000.
Pitch_MOI: Increased from 363,000 to 1,650,000.
Suspension Damping (point.0 bis .2): The ratio (Max/Static Ratio) has been reduced from 2.5 to 2.3 (preventing the suspension from bottoming out as easily), and the damping ratio has been increased to 0.75 and 0.80, respectively, so that the nose settles smoothly after braking rather than collapsing abruptly.
[contact_points]
point.0=1, -23.63, 0.00, -7.3, 1600, 0, 0.5625, 69.8, 0.35, 2.3, 0.75, 10.0, 10.0, 0, 260.0, 260.0
point.1=1, -63.43, -6.76, -7.9, 1600, 1, 1.0, 0.0, 0.55, 2.3, 0.80, 9.0, 9.0, 2, 260.0, 260.0
point.2=1, -63.43, 6.76, -7.9, 1600, 2, 1.0, 0.0, 0.55, 2.3, 0.80, 9.0
static_pitch = -1.8
static_cg_height = 7.3
gear_system_type=1 //Hydraulic
emergency_extension_type=2 //None=0,Pump=1,Gravity=2
[WEIGHT_AND_BALANCE]
max_gross_weight = 99500 // (pounds)
empty_weight = 52230 // (pounds)
reference_datum_position = 55.35, 0, 0 // (feet) distance from FlightSim Reference position, which is: (1/4 chord, centerline, waterline)
empty_weight_CG_position = -56.0, 0, 7 // (feet) longitudinal, lateral,
max_number_of_stations = 50
station_load.0 = 170, -8.67, -1.4, 0.0 // Weight(lbs), longitudinal, lateral, vertical positions from datum (feet)
station_load.1 = 170, -8.67, 1.4, 0.0 // Weight(lbs), longitudinal, lateral, vertical positions from datum (feet)
station_load.2 = 2500, -62.0, 0.0, 0.0 // Weight(lbs), longitudinal, late
station_name.0 = "Pilot"
station_name.1 = "Co-Pilot"
station_name.2 = "Passengers"
;Moments of Inertia
empty_weight_pitch_MOI = 1650000
empty_weight_roll_MOI = 1150000
empty_weight_yaw_MOI = 1850000
empty_weight_coupled_MOI = 0.0
The moments of inertia (MOI) values entered are appropriate for a light Learjet, but far too low for a heavy Global Express.
It is as if the aircraft, while on the ground, has the physical weight of a truck but the inertia of a feather—which causes it to sway excessively when cornering.
Last edited:
scotty
Members +
For the moment i have this one at the parking position. Touchdowns will follow today.Scotty, I haven't tried it yet but have you done some touch downs from the external view?
That's how I can tell if the gear positions in [contact points] are close.
Sbob
SOH-CM-2026
Your numbers look good.
While we're on the subject-
[Views]
eyepoint= -25.63, -1.85, 3.7 //(feet) longitudinal, lateral, vertical distance from reference datum
This is about as close as I can figure it, unless we get a VC.
This is also based on SMike's FD update.
Update- I made a change to [views]. I have a dandy CL-604 installed in FS2002 that uses -1.85 as the Y value. The -604 has about the same cabin diameter and also has a VC.
While we're on the subject-
[Views]
eyepoint= -25.63, -1.85, 3.7 //(feet) longitudinal, lateral, vertical distance from reference datum
This is about as close as I can figure it, unless we get a VC.
This is also based on SMike's FD update.
Update- I made a change to [views]. I have a dandy CL-604 installed in FS2002 that uses -1.85 as the Y value. The -604 has about the same cabin diameter and also has a VC.
Last edited:
scotty
Members +
I also think it’s best if you work with my values yourself.Your numbers look good.
It wouldn’t be of any use for you if i send you a screenshot of my touchdown. It’s better for you if you test things using my data on your own PC and your own FS9 setup.
ScottishMike1
Members +
Sbob and Scotty I have adopted all your changes: Contact Points, Weight and balance and Viewpoints.
Additionally I have made the changes below:
Changes in BOLD:
-----------------------------------------------------------------------------------------------------------------
[weight_and_balance]
// ACM V2.5
max_gross_weight = 99500 // (pounds)
empty_weight = 52230 // (pounds)
reference_datum_position = 0, 0, 0 // (feet) distance from FlightSim Reference position, which is: (1/4 chord, centerline, waterline)
empty_weight_CG_position = 0.0, 0, 0 // (feet) longitudinal, lateral, vertical distance from specified datum
-------------------------------------------------------------------------------------------------------------------
[fuel]
Center1=-20.0, 0.0, -2.5, 800.0, 0.0
Center2=-20.0, 0.0, -2.5, 800.0, 0.0
LeftMain=-20.0, -20.0, -2.5, 1200.5, 0.0
RightMain=-20.0, 20.0, -2.5, 1200.5, 0.0
fuel_type=2
number_of_tank_selectors=1
electric_pump=1
---------------------------------------------------------------------------------------------------------------------
Now the Centre of Gravity for full or empty tanks is within acceptable parameters:
Almost full:
Almost empty (maybe some adjustment could still be made):
A delight to land, arriving at Sestri airport Genoa (LIMJ) once on the ILS glideslope put on full flaps and 125Kts. (and wheels down of course) Some 3 nmi. from touch down switch off auto speed and autopilot and she stays rock steady on the glide slope. Some pics:
As you mentioned Sbob it could do with scrape points for the wing tips and tail. Also in view of what Motormouse said should we re-introduce wing sway on taxi ?
Additionally I have made the changes below:
Changes in BOLD:
-----------------------------------------------------------------------------------------------------------------
[weight_and_balance]
// ACM V2.5
max_gross_weight = 99500 // (pounds)
empty_weight = 52230 // (pounds)
reference_datum_position = 0, 0, 0 // (feet) distance from FlightSim Reference position, which is: (1/4 chord, centerline, waterline)
empty_weight_CG_position = 0.0, 0, 0 // (feet) longitudinal, lateral, vertical distance from specified datum
-------------------------------------------------------------------------------------------------------------------
[fuel]
Center1=-20.0, 0.0, -2.5, 800.0, 0.0
Center2=-20.0, 0.0, -2.5, 800.0, 0.0
LeftMain=-20.0, -20.0, -2.5, 1200.5, 0.0
RightMain=-20.0, 20.0, -2.5, 1200.5, 0.0
fuel_type=2
number_of_tank_selectors=1
electric_pump=1
---------------------------------------------------------------------------------------------------------------------
Now the Centre of Gravity for full or empty tanks is within acceptable parameters:
Almost full:
Almost empty (maybe some adjustment could still be made):
A delight to land, arriving at Sestri airport Genoa (LIMJ) once on the ILS glideslope put on full flaps and 125Kts. (and wheels down of course) Some 3 nmi. from touch down switch off auto speed and autopilot and she stays rock steady on the glide slope. Some pics:
As you mentioned Sbob it could do with scrape points for the wing tips and tail. Also in view of what Motormouse said should we re-introduce wing sway on taxi
?Motormouse
SOH-CM-2025
Haha 9H-FED, there's a good RW story to that one involving colombian drugs.
Meanwhile, Global can actually approach and touch down as low as 90Kts...
Ttfn
Pete
Meanwhile, Global can actually approach and touch down as low as 90Kts...
Ttfn
Pete
Airbasil
Members +
Anyone up for some repaints on it?
As i could need some of them:
Flexjet 9H-99FX:
https://www.jetphotos.com/photo/11682542
Flexjet N96FX:
https://www.jetphotos.com/photo/10726642
Flexjet 9H-GVBJ:
https://www.jetphotos.com/photo/12195658
Execair C-FROJ
https://www.jetphotos.com/photo/11952257
Execujet Aviation HB-JRJ:
https://www.jetphotos.com/photo/10154830
Comlux Aviation HB-JEY:
https://www.jetphotos.com/photo/6034419
TAG Aviation G-SHEF:
https://www.jetphotos.com/photo/7123521
TAG Aviation 9H-KDR:
https://www.jetphotos.com/photo/11668511
Jet Aviation Business Jets VP-CGO:
https://www.jetphotos.com/photo/7112023
As i could need some of them:
Flexjet 9H-99FX:
https://www.jetphotos.com/photo/11682542
Flexjet N96FX:
https://www.jetphotos.com/photo/10726642
Flexjet 9H-GVBJ:
https://www.jetphotos.com/photo/12195658
Execair C-FROJ
https://www.jetphotos.com/photo/11952257
Execujet Aviation HB-JRJ:
https://www.jetphotos.com/photo/10154830
Comlux Aviation HB-JEY:
https://www.jetphotos.com/photo/6034419
TAG Aviation G-SHEF:
https://www.jetphotos.com/photo/7123521
TAG Aviation 9H-KDR:
https://www.jetphotos.com/photo/11668511
Jet Aviation Business Jets VP-CGO:
https://www.jetphotos.com/photo/7112023
Last edited:
ScottishMike1
Members +
Well scotty has a nice Canadian government texture. Is it shareable?
Airbasil
Members +
That one is downloadable on Avsim:
“Royal_Canadian_Air_Force_Bombardier_Global_Express.zip"