Purpose is to minimize prop disk diameter, presumably to improve ground clearance, maybe engine spacing, too. But complexity, control, and weight increase. But for presumed operating profile objectives, maybe rougher fields, perhaps it suits a special slot, or the engineers just wanted to see if they could do it!
Can you imagine feathering? Little clearance, and deice appears to be three level electic boots. 12 scimitars per engine. Look out birds, here we come, giant bird slicers, ehhh?
Having said that, they do some nice work, in the Ukraine, and seem to think up some interesting designs.
