From Burmann method :)
Draw an Arc-cicle for the future Flow

Draw a vertical line, Draw an Helix,
Loft them

Draw another vertical Line
Call Flow
Select Surface
Select Second vertical Line , Select Arc Line
Flow

@ Michael : why we can't retake the first vertical line as Base Line for the Flow Function ?



PS

I have forgotten to make a Tube but that is trivial :)
and a Shell but that will be exactly the same except a thickness to the Helicoïd surface! :)