... emm... I deleted it...
first define the design of the propeller, the shovel and the rotation angle of the profile of the shovel
from a generic metric family, in a prospective view, define the reference plans, so many are the subdivision segments of the propeller's shovel (from the center floor to the outside).
in the view of the plant, starting from the central floor, use the command : solid> union, and on two successive floors draw the profile of the blade (+ or - an ellipse). on each floor, the section of the blade (the ellipse) is rotated (it increases the angle of rotation up to 90° regarding the departure, at the extreme point of the shovel), and continue with the same command with the successive planes (increasing/reducing the profile of the shovel).
the profile on the same floor, which connects two consecutive segments, must have the same form.
central support is designed by a revolution extrusion
alternatively: having a propeller in dwg 3d format, you can import it and use it as a block