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[WxTech]

I asked about this in another member's thread, and have got no answer. In case it requires a fresh topic to capture more eyeballs... 

As the title asks, do we have ground effect for airfoils near ground/water modeled? I have some vague sorta-kinda memory of this being mentioned way back in the day (early 2000s), perhaps in a readme or some such. I've not delved at all into matters regarding the FM, hence my ignorance.

[Epervier]

I don't know.
However, when I tested helicopters in my 409/UP2.01 I found a ground effect on vertical take-offs.
Is this something in the fmd? Was it just an illusion? 
I don't know...

[TXZCJSP]

If no one is ever going to be able to answer then might as well put up a rough simulation first?
Let's say an updraft of 3 meters per second.
Until someone can answer that question with certainty

[SAS~Storebror]

There's a little bit of gound effect modelled in IL-2 1946 below 10m AGL.
It mostly affects turbulence though.

If no one is ever going to be able to answer then might as well put up a rough simulation first?
an updraft of 3 meters per second

That doesn't even remotely cut it.
Ground effect cuts in at an AGL equal to roughly half a plane's wingspan.
1st problem here: You'd need to take into account whether you have a low- or high-winged aircraft. Seriously. The outcome is distinctively different.
Furthermore it's not just lift (ram effect), but also reduced induced drag that forms the ground effect.
Last but not least, for rotorcraft (heli, Lerche) the ground effect is very different as they mostly benefit from the ram effect during static hover, whereas with increasing velocity they rather behave like fixed wing aircraft.
The topic is very complex, hence many CFS simply skip this.
IL-2 Great Battles for instance has a similarly non-existent ground effect implementation like 1946.
DCS has ground effect simulated, but it feels... weird, to say the least.
MS FS 2020 has ground effect simulated and this is the only time I would say it feels remotely reasonable.


Mike

[WxTech]

I suppose FM.Length (is this longitudinal length, wingspan, or something else?) would provide something of a value to use for the starting height for commencement of an additional lift component. But one would ideally like to have the height of the airfoil with respect to the plane's 'datum',  if such exists.

I have no strong feelings on the matter, for plane landings are reasonably well enough handled for a shootin' game.

[SAS~Storebror]

I suppose FM.Length would provide something of a value to use for the starting height for commencement of an additional lift component.

Not at all. It's completely unrelated.

is this longitudinal length, wingspan, or something else?

It's simply the plane's length in meters and that has nothing to do with ground effect.

one would ideally like to have the height of the airfoil with respect to the plane's 'datum',  if such exists.

It doesn't, that's part of the problem.

I have no strong feelings on the matter, for plane landings are reasonably well enough handled for a shootin' game.

Exactly my feeling.
Don't fix something that ain't broken.


Mike

[Draken]

So ,I guess that it is useless to request aircrafts mainly designed around the ground effect , like hovercrafts or ekranoplanes ?