Parts that rotates

Utility

Before proceeding, be sure to read the Introduction.

You can use from car engines to drone propellers; In the ventilation of the engine and in ventilator of a truck cockpit.
You can adjust the speed with a multiplier, just add mu=FLOAT on node name, for example mu=0.5 for half speed.
It is also possible to set the rotation axis with _x or _z (default is y).

gear

Description: A part that rotates with the engine on. Increases the rotation speed with gas pedal.
Examples: f_gear, f_gear_mu=1.5. Use f_spin for planes and helicopters.

fan

Description: A part that rotates with the engine on, in constant speed.
Examples: f_fan, f_fan_mu=1.5.