I got a comment from realrouge encouraging me to redesign this electric motor boat prop to enable us to print in one piece and try it. So I redesigned the prop, made it a bit smaller to fit on a 200 by 200 printing plate, so printable on most of the printers.
I also redesigned the prop blades and increased the number of blades to 4 to compensate the size reduction.
I am trying to print this over the weekend, but will not be able to try since only my father in law has the motor in Transylvania...
So if anyone is able to try and give a test to it, please send me feedback.
I suggest to print with finer layer height and high infill density.