Eliptical helical sweep to swept blend? Help please

[ptc-5314720]

Firstly, is there a way to strech a helical sweep so that it is eliptical rather than round?

Also, is there a way to make a smooth transition between the end of a helical swep and a the start of a swept blend?

Thanks.

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[TomD.inPDX]

You might try wrapping a sketch around an elliptical surface.

Otherwise, not perfectly helical is a method by which you intersect a helical surface with the elliptical surface and use the intersection as an origin guide.

And there was a sheetmetal solution posted by PTC at one time to map a curve onto a flattened sheetmetal part and bending it back. However, that might not be easy with a elliptical shaped sheetmetal part.