Sweep1 Orientation of section curve relative to rail: what is the command logic?

Hi,

I am trying to understand the logic of how the profile curve is oriented on the rail as it is swept along the curve.
Unless, the “maintain the parallel to Cplane” option is selected it is not oriented relative to the Cplane.
Furthermore, it does not appear to follow the curve’s osculating plane (as viewed thru the curvature comb).

So how does it get oriented then ?
Sorry for what may seem like a theoretical question…
Thanks

Even if you understand why (and yeah, it’s “academic”), you’ll still have to deal with it. Aligning the Perp Frames with Unit Z using Align Plane can sometimes be useful:

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