Strange behavior of FMS Models - Sinking into ground

[Jürgen N.]

As I am completely new here please excuse if this topic has been discussed before.
There is a strange behavior of nearby all models I have tested until now. From small Multiplex hot liner SpaceScooter to good old lady Minimoa, a wonderful sailplane:
they all seem to sink into the ground like Titanic (God bless her soul) into the sea if ones waits with liftoff a few moments.
This looks very strange and is not very encouraging or advantageous for FMS.
Despite it seems not to have an effect on flight behavior.
Is this a known point?
Kind regards from Switzerland
Jürgen

[ggunners]

Jurgen,

Version 2.7.x FMS models had a single collision point (CG) and no landing gear and very easily sink into the ground.

On Version 2.8.x FMS models with the larger .par file, the landing gear position will keep the model from sinking into the ground. You will still see the wings sink into the ground during low turns near the ground if the simulated collision forces are lower than the collision parameters set up within the .par file.

So, version 2.7 models will sink, 2.8 should not if the .par files are created correctly.

-- ggunners

[ptrdeng]

I still use FMS 2.7 as 2.85 does not work too well in my computer.
I can tolerate with the sink of models, but feel strange about the self level-off of fuslage, and floating of tail, of Bf109, Su-26 or Pitts, when they are on the run way statically.
I can press down the tail with elevator control after applying a little throttle, so the geometry of model seems OK. The tail will jump back to level-off postion or even the nose and propellor will kiss the ground if I release the elevator control and throttle back. Looks the problem is in the center of gravity and the static attitude of craft.