Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4900831.

Printing this as replacement prop for Harbor Freight RC Neptune boat.

I really have no idea about RC boats, or propellers, I just eyeballed the plastic ones that came with the boat and modeled it in blender

Main reason is that this PLA prop is much stiffer than the plastic ones that the boat came with. (apparently it is better if your propellers are not flexible)

It doesn't seem to be better than the ones the boat came with doesn't work as well for some reason, not sure why?