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MSFS20 MSFS Flight Model when landing

E

eric_marciano

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france
Hello,

Am I the only one being disturbed by the way the MSFS flight model reacts when landing?
Since the release of MSFS 2020, I noticed this problem and it kept going update after update. The problem is about the behavior of the aircraft when touching down when landing. It always tends to turn left or right, forcing you to apply a strong rudder correction that is not realistic at all. I used to be a private pilot, I flew the Cessna 152, 172, Piper PA-28, Socata TB-9. I also flew professional airline simulators, A320 and CRJ. I never saw such behavior in real life.
You can have crosswind when landing, which will cause this tendency to turn into the wind. I know this, but when this happens you feel the wind deviation before touching down and the behavior on ground is the continuation of the behavior in flight. What I see in MSFS is different: the aircraft flies normally during approach and when you have little or no crosswind, the aircraft still turns left or right as soon as the wheels touch the ground.
I also know about the torque effect when you have a propeller, this is noticed on take off and it is normal, but when landing the engine is idle so the torque effect should be close to 0. In addition, when landing a jet powered aircraft, the torque effect cannot explain this behavior when landing.

Did you also notice this?
Do you think it is realistic or is this effect too strong?

I recently saw an interview of a real airline captain, saying the flight was realistic except "the very last moment of the flight", I know what he was talking about.
I would be happy to have your opinion about this.
 
Hi Eric,

On a discussion read on AVSim about looking back on 2 years of using MSFS, the topic drifts to page 9-10 about the FDV and the ongoing modifications on SU10 Beta.
Of course, the subject of landings and aircraft behaviour in crosswind is discussed.
a) Asobo seems to have worked on these points in particular by adding some variables (Extra 330 / Cessa 172 if I remember correctly).
b) On the other hand the subject of wheel friction is also raised.
=> The problem is that the names of these new variables are not given.

The link: answer from lwt1971 in
www.avsim.com

MSFS: My 2 Year Review

www.avsim.com www.avsim.com

PS: Sorry, i just see your post on that suject on AVSim ;) (Rocky)
 
Last edited:
Lagaffe said:
Hi Eric,

On a discussion read on AVSim about looking back on 2 years of using MSFS, the topic drifts to page 9-10 about the FDV and the ongoing modifications on SU10 Beta.
Of course, the subject of landings and aircraft behaviour in crosswind is discussed.
a) Asobo seems to have worked on these points in particular by adding some variables (Extra 330 / Cessa 172 if I remember correctly).
b) On the other hand the subject of wheel friction is also raised.
=> The problem is that the names of these new variables are not given.

The link: answer from lwt1971 in
www.avsim.com

MSFS: My 2 Year Review

www.avsim.com www.avsim.com

PS: Sorry, i just see your post on that suject on AVSim ;) (Rocky)
Click to expand...
Indeed, I created also a discussion on Avsim and it keeps going, it is already 5 pages long. Anyway, I now know Asobo is aware of the problem and will work on a fix, the sooner the better.
I also saw many other simmers noticed this problem, I am definitely not the only one...

Thanks for your feedback
 
if you're talking about a yaw with NO crosswind, if it's any help there's been no sign of that at all with gliders, which are simply powered a/c with the engine more-or-less stopped (MSFS requires you have an engine, but the 'old' prop physics is zero drag). So the landing yaw sounds engine related to me.
 
The new variables are now described in the SU10 SDK:

round_crosswind_effect_zero_speedThis parameter represents the world speed (in ft per second) at which 0% of the crosswind effect is applied to the aircraft. This parameter will work in two different ways:

  • With the ground rudder assistance enabled, at the given speed and below, the lateral (x) component of the wind is set to zero.
  • With the ground rudder assistance disabled, crosswind is completely cancelled out below ground_crosswind_effect_zero_speed ft per seconds of IAS, and it is gradually blended in up to 100% at ground_crosswind_effect_max_speed ft per seconds of IAS.

Note that this value can be set to -1000 to have a 100% realistic simulation where the crosswind is never cancelled out.

Default value is 5.		FloatNo
ground_crosswind_effect_max_speedThis parameter represents the world speed (in ft per second) at which 100% of the crosswind effect is applied to the aircraft.

Note that this value can be set to -1000 to have a 100% realistic simulation where the crosswind is never cancelled out.

Default value is 80.		FloatNo
ground_high_speed_steeringwheel_static_friction_scalarAt high speeds, tires are rolling and - depending on their shape and width and how much they are inflated - they will more or less resist rotation or sideways motion. This parameter allows you to define how much a moveable wheel resists static friction which goes sideways or resists rotation around the vertical axis. Essentially, it allows you to control how much the aircraft will move into the crosswind when rolling at higher speeds, and reducing the scalar will reduce the friction, so the aircraft is more likely to slide. Note that only the lateral forces are impacted by this value, so rolling friction and braking when your aircraft is rolling straight will not be influenced.

Default value is 1.		FloatNo
ground_high_speed_otherwheel_static_friction_scalarAt high speeds, tires are rolling and - depending on their shape and width and how much they are inflated - they will more or less resist rotation or sideways motion. This parameter allows you to define how much a non-moveable wheel resists static friction which goes sideways or resists rotation around the vertical axis. Essentially, it allows you to control how much the aircraft will move into the crosswind when rolling at higher speeds, and reducing the scalar will reduce the friction, so the aircraft is more likely to slide. Note that only the lateral forces are impacted by this value, so rolling friction and braking when your aircraft is rolling straight will not be influenced.

Default value is 1.

https://docs.flightsimulator.com/fl...SimObjects/Aircraft_SimO/flight_model_cfg.htm
 
Thanks for the info, I heard about these parameters but never had such details.
This is probably because I didn't upgrade to SU10 yet :)
 
I have flown after the installation of SU10 and I have the feeling it is much better now. Yesterday I landed with a significant cross wind and I had to correct the trajectory during the whole approach, so that the rudder correction when landing was the continuation of the correction used during final approach, very consistent.
Did you also notice the same?
 
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