Not one of my crazy projects – looks like this aircraft needed some extra cooling so the owner has taken to creating an air pump at the root of the propeller. Normally there isn’t much going on there so seems reasonable.
What could possibly go wrong?
The print layering is weakest between layers so you could find it separates. At a maximum of 3000rpm thats probably unlikely but I would be checking it carefully for cracks and would have liked to have seen a lamination with the layering going 90 degrees.
If the blade does become detached, it could find its way directly into the intake entirely blocking it. That would be enough to overheat that engine and bring down that aircraft.
