Xtreme Prototypes Gates Lear 25 Released

Tom Clayton

Tom Clayton

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XTPRO GLJ Model 25 CSE (MSFS 2020) | Xtreme Prototypes

NEW! The GLJ Model 25 Classic SE is our new study-level Gates Learjet 20 Series business jet addon for Microsoft Flight Simulator 2020 (compatible with MSFS 2024)! This complex aircraft simulator features the classic retrofitted GNS 530 virtual cockpit, 14 liveries, full PBR materials and...
www.xtremeprototypes.com www.xtremeprototypes.com

328 page(!) manual

This is advertised as "study level," and the price reflect that!
 
I picked up the model late last night when it was released. It has some issues with the flight model, namely it tends to wheelbarrow (nose down attitude) at full flaps during approach which is absolutely not correct. The proper speeds should be be in the 140kias region with full flaps and nose level which will maintain the proper AoA. I am going to do some of my own modification and testing to see if I can get this issue fixed. I have the Flysimware Lear 35 as a good reference which seems to have proper flight dynamics. Other than that, this mode is VERY nice and easy to run the flows on. Will re-post later on my findings.
 
I did a copy and paste swap of the core Flight_Model entries between the Flysimware Lear 35 and this model and it seemed to help correct things a bit however, I am going to send in my findings & questions to XP customer support and see if we can get this sorted in a future update. Too nice of a model to not fix.
 
Update: Reported my findings on the Approach Pitch/AoA issues to their team. In the meantime I made a fix.

In the Flaps entry at the bottom of the Flight_Model.cfg file, I changed the following numbers:

lift_scalar = 0.5 ; Scalar coefficient to ponderate global flap lift coef (non dimensioned) //1.6
drag_scalar = 1.4 ; Scalar coefficient to ponderate global flap drag coef (non dimensioned) //1.6
pitch_scalar = 2.0 ; Scalar coefficient to ponderate global flap pitch coef (non dimensioned) //1.0
max_on_ground_position = 3 ; Dynamically set in-tool to last flap-position index by defaut when -1 is found.

This fixed the Pitch/AoA and general Speed/Drag behavior on Approach at Full Flaps with the Gear Down (Approach Final Config).

As a consequence, the stock vertical Eyepoint sits too low and so I made the very incremental adjustment to fix that issue as well:

[VIEWS]
eyepoint = 11.5,0,3.0 ; (feet) longitudinal, lateral, vertical distance from reference datum //eyepoint = 11.5,0,2.9 ;

As far as I am concerned, it's good to go now excepting issues others may have reported to the developers in XP. I am super happy they have kept this model alive all these years. let me know what you think on the adjustments.
 
StormILM said:
Update: Reported my findings on the Approach Pitch/AoA issues to their team. In the meantime I made a fix.

In the Flaps entry at the bottom of the Flight_Model.cfg file, I changed the following numbers:

lift_scalar = 0.5 ; Scalar coefficient to ponderate global flap lift coef (non dimensioned) //1.6
drag_scalar = 1.4 ; Scalar coefficient to ponderate global flap drag coef (non dimensioned) //1.6
pitch_scalar = 2.0 ; Scalar coefficient to ponderate global flap pitch coef (non dimensioned) //1.0
max_on_ground_position = 3 ; Dynamically set in-tool to last flap-position index by defaut when -1 is found.

This fixed the Pitch/AoA and general Speed/Drag behavior on Approach at Full Flaps with the Gear Down (Approach Final Config).

As a consequence, the stock vertical Eyepoint sits too low and so I made the very incremental adjustment to fix that issue as well:

[VIEWS]
eyepoint = 11.5,0,3.0 ; (feet) longitudinal, lateral, vertical distance from reference datum //eyepoint = 11.5,0,2.9 ;

As far as I am concerned, it's good to go now excepting issues others may have reported to the developers in XP. I am super happy they have kept this model alive all these years. let me know what you think on the adjustments.
Click to expand...
Is there a forum or Discord for this aircraft/developer ?
 
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