Yep, #27 is a little too thin in the blades. The straight line kills the fluid feel of the icon. Maybe I'm shooting for a semi-symmetrical airfoil (
http://www.rcaeronautics4dodos.filipinovegetarianrecipe.com/images/airfoil_03.jpg, http://www2.tech.purdue.edu/at/courses/aeml/airframeimages/airfoil.jpg), where it's only straight at the back half of the wing, if at all. I hope this doesn't seem like splitting hairs.
#28 has really already addressed this, and is a great entry. I would like to see a 100% saturated dark navy blue to maybe 20% saturation of the same color in place of the black to blue gradient (more like #25, but not all the way to white/0%). Would also like to see if we can get that overlap/mobius effect back without loosing what we have.
I am ok making the center triangle almost vanishingly small, if it helps, and maybe even including a tiny gap between the panels near the center (connecting the "hub" with the "blades"), but not quite as much as #23.
Looking again, what I'm asking for is basically #25, but with a somewhat smaller hub, and larger blades, but that will probably trade off with going back to the boat propeller look again, which is why I want to look at a slight separation at the hub.
Thanks for your continued revisions, and LOL at your comment on #26 :)