Looks like this fan is some kind of "cooling" fan - not designed and made to be used as DF in aviation. Also it's made of some material not designed for hi rpm and aerodynamic loads - it look like this fan came from some automotive field(radiator cooling fan?)You guys said this was bad - that having more distance between tip & duct leads to more turbulence losses.
Their fans look thicker and heavier, different than PJ-2 fan-blade pictures shown by Malish.
Blades look wider. Even hub of fan looks much larger.
Is there some advantage to this?