Hello Rod,
Please check your small object with attached smoke at different airport heights.
In the flight simulators since the FSX (or even earlier) there is a bug.
Which attached effects are no longer placed at the intended location on the object.
The higher the object with the effect is placed, the greater the deviation of the effect.
In most cases the deviation is visible from a height of 2500ft above sea level (MSL).
For better illustration, I placed a test object ("gen_tv01", a standard MS object) at different heights.
The tower has an attached effect at the top (a red flashing light).
The test object placed in Petersburg (PAPG) ...
The ground here has a height of 96ft (MSL).
Side view ...
Top view…
As you can see, everything fits very well.
Test object placed in Porcupine Camp (SIRP) ...
The ground here has a height of 5960ft (MSL).
Side view ...
Top view…
Here's the whole thing now looks different.
This bug is probably due to the fact that the developers of MS at that time tried to represent the flight simulator world as a globe.
In P3Dv4 this bug is still available.
My thoughts are here with Doug.
He is doing a lot of work.
If required, I will gladly provide my modified smoke effects (Yes Bay Lodge, Taku Lodge, Gilbert Bay, Misty's Place).
And I can also help with the further modifications of the smoke effects.
With me there is an extra Bgl file for the smoke effects, because I use the XML file as a basis.