Hi Danny, thanks!

So when you create a Toroidal Helix, it asks for these 2 radius parameters:



The "Radius1" value sets the distance from the center of the torus to its centerline, like this:



The "Radius2" value sets the thickness of the torus - how large the torus is around that centerline, like this:



So that means that the outer diameter of the entire thing will be the Radius1 and Radius2 values added together, and then multiplied by 2.

These are values that you enter when creating the toroidal helix.

The unit system used will be the current unit system that is active in MoI at that time, which can be set under Options > General > Unit system.

- Michael