Hi Targor
1. Here are two screens with the scales of my game.. everything works as expected -
.
Here is my Hud3 texture (some colors were changed), you can try it if you want -
http://rghost.ru/45374538
2. Here are few screens with independent engines control -
Right shaft -
.
Left shaft -
.
As you can see the speed is about 0.5 knot and works only one engine at a time..
Try to do it in the next way - all stop → disable one engine → set the speed for the enabled engine..