FreeCAD: Your Toroidal Propeller Is Invalid

Will the real Toroidal propeller please stand up?
00:00 Introduction
01:08 Lofted design in Part Workbench
05:44 Make it two blades
05:58 Geometry trouble
06:45 FreeCAD workaround
07:57 Part Design Workbench
10:47 Make it 2 blades again
10:57 Geometry troubles again
11:42 Conclusion

[@KravchenkoAudioPerth]

Learning! Thanks for making this video!
Mark

[@terrylembke8100]

Hi , Thanks for sharing your videos . how would a flow program work with this ? like open foam or something else ? could you do a video or two with this and changing parameters and showing the difference in efficiency Please ?
Terry