This propeller is part of a bigger boat motor project that I'm working on, but I decided to publish this propeller in advance as it will take some time before the rest is finished, and maybe some one can find this useful.

Note! These blades are the first prototypes, I will make more blade designs to fit to this hub, so even if you only need the propeller and don't care about the rest of the project, check back here for more blades.

Specification

• Outer diameter: roughly 80mm (a little bit more)
• Blades: 3
• Inclination: No idea. :)
• Hub diameter: 32mm
• Length: 27mm
• Shaft bore: 6mm
• Locking mechanism: 2mm hole for cotter pin
• Screws: 3pcs M3x 8(min) - 16(max) (or skip screws and use glue).

What is special?
This prop is specially designed for 3D-printing. This means it's designed to be printed using minimum support (none), which makes the result much better and reduce processing time.
The prototype in the pictures has had no post-processing work.

In my experience, propeller blades are troublesome as they are so thin so when they are printed on support, they tend to bend, come loos, catch the print head causing layer shift and all sorts of problems. Not to mention the rough surface caused by the support... But you'll have none of those problems with this one! :)

It is also modular which means that you can replace one blade if it's damaged.
It's quite a big prop, and can it be down-scaled? yes, it all depends on your nozzle size and printer. Best way to find out is to try in the slicer and look at the layer previews, you'll see that when you downscale too much parts of the blades will get too thin to print, then you know the limit.

what is it designed for?
You'll see.... :)