Hi ,i must admit that i didnt touch this more than once in MSFS2020 (Set to Legacy).

Is there a list with addons and default aircraft with  benefits of using Modern flight model?

Michael Moe

Like.. all of them.

 Even if you set it to legacy there’s a multitude of addons that force it to modern. 

24 minutes ago, Michael Moe said:

Hi ,i must admit that i didnt touch this more than once in MSFS2020 (Set to Legacy).

Are you sure it’s set to legacy?

1 hour ago, DD_Arthur said:

Are you sure it’s set to legacy?

Well now i have to check again for sure

I saw the FSL is using Legacy model. 

Michael Moe

8 minutes ago, Michael Moe said:

Well now i have to check again for sure

I saw the FSL is using Legacy model. 

Michael Moe

I’m not sure if FSLABS is using legacy mode for it’s flight model.

The legacy mode flight model check box should really be removed from the UI, it causes much confusion and seems to have been included so older FSX ports could run in the sim. That never happened.

Running the flight model in Legacy mode is going to lead to some really funky behaviour for 99.9% of add ons….

Forgive me, but what's the difference? Surely a flight model is a flight model? 

Doh! DD more or less answered it. (Read more carefully)

I understood legacy was the old FSX flight model, a lot less parameters, that would allow old aircraft from the FSX days to use the sim. FS Labs is the first aircraft I have heard uses the legacy model, is that actually the case? That may explain why numerous people have said it flies like it is on rails.

Edited December 22, 20241 yr by Cognita

Brilliant! That clears that up nicely.

1 hour ago, Cognita said:

I understood legacy was the old FSX flight model, a lot less parameters, that would allow old aircraft from the FSX days to use the sim. FS Labs is the first aircraft I have heard uses the legacy model, is that actually the case? That may explain why numerous people have said it flies like it is on rails.

Actually that’s not exact. Legacy gives more parameters to designers. For ex you can adjust mach impact on lift which is not possible in Modern. It seems for main forces , resulting CL, Cd and Cm are about to be same computation than in P3D. Inertia, flight controls and frictions are different than in former fs. Problem is end result is excessively stable aircraft (rail behavior) and poor rotation inertia modelisation with payload (an old big still there inherited from the past).

In modern, you have much less parameters. A lot of computations are semi hidden and deduced by Asobo internal models from geometric specs as per described in cfg (not graphical model). Ex camber, wing sweep, dihedral etc. Problem is the internal Asobo models are often wrong, especially when applied to an aircraft operating in high subsonic like an airliner : mach effect on lift is not modeled, drag polar are not matching real numbers, moment is tunable with only 2 points (whereas Cm vs aoa have 16 points in P3D…)

FM designers have no choice but to play with parameters to find best fit + fake stuff by playing with spoilers or flight controls. 

Another radical solution is to go for full external FM like A2A did. 

2 minutes ago, Irisha said:

Legacy gives more parameters to designers.

One of the "parameters" that it adds to the Orbx Blackwing, for example, is that it will not move at all.
Perhaps I have also misunderstood that it was there purely for FSX aircraft and otherwise
has no purpose at all.
 

13 minutes ago, Irisha said:

Actually that’s not exact.

Thank you for the clarification. Did the legacy mode carry into 2024?

18 hours ago, Cognita said:

I understood legacy was the old FSX flight model, a lot less parameters, that would allow old aircraft from the FSX days to use the sim. FS Labs is the first aircraft I have heard uses the legacy model, is that actually the case? That may explain why numerous people have said it flies like it is on rails.

I'm afraid your post highlights a continuing myth that is simply untrue.

Fact No.1 : Whether or not a flight model feels like it is "on rails" is nothing connected with the method or system used, only the individual design of each individual flight model, or the movement or lack of movement of air through turbulence or zero turbulence.

No.2 Actually, the FSX/P3d core flight model file is equally if not more detailed than the FS2020/2024 method. The latter looks more complicated because the parameters from FSX were directly translated in to text files from the original look up tables.

No.3 Many of the parameters that were quite useful in the "legacy" flight model were deprecated and some were not replaced with anything better. A few additions were made but more key params were taken away than added.

No.4 The feeling of "flying on rails" is mostly a function of still air or lack of turbulence, or up and down draughts, and is very little to do with a particular flight model. Also contributing is the amount of inertia within a simulated aircraft.

No.5 In still air all well designed aircraft fly in very good harmony. That is to say they are very stable in pitch, fairly stable in roll and reasonably stable in yaw unless (1) the pilot is uncoordinated or (2) over-controls.

No.6 The larger the aircraft the more stable it is generally. When you see videos of Boeing or Airbus pilots sawing away at the controls, they are usually doing so when flying a manual approach and trying to keep dead on the localiser and glideslope. Some use excessive movement, others use a lot less according to their own technique.

No.7 When you hit turbulence, particularly when shooting an approach, there will be a lot of correction needed, but in benign conditions the opposite is the case.

I personally tweaked a few FS2020 aircraft privately using both current and "legacy" methods and neither was better or worse than the other most of the time, although a few parameters that were very useful were taken away and not replaced.

There is nothing wrong whatever with designing a flight model using the "legacy" method. In practice it is at least equally powerful and in turn equally flawed as the "new" method.

Edited December 23, 20241 yr by robert young

My head, my head. 🤣 So is there a preferred method in ~24?  Legacy or Modern, Modern or Legacy or is it irrelevant?                   

Always use modern and forget that legacy exists.