Those blades are basically junk of course, seen alot of them that have slung apart in higher winds, no furling, no loads, just free spinning into the winds on bearings at all times. And at head level also, gee and we worry about our real ones.
Anyway I also wondered if the bearing was knocked out of the hub then the blades mounted to a small DC motor if it would make any power that way. I think it would. It may not be the best thing but geuss what I am flying now and it makes a little power
I have a treadmill type DC motor on a small conduit about 4' above a trailer house roof. The blades are nothing more than the fan from probably an old air airconditionare or similar.
Though it's nothing I would plan to use to power my house, this little thing has made some power as crappy as it is. 4 big fat flat blades at the wrong angle. Just something I did in about an hour total. I have seen about 30 or so open volts, and with a 12V car fan (6" cigarette lighter plug type) for a load it's spun up the fan pretty fast. I charged a 7amp hr badly discharged SLA up with it though it took some time to do.
One of the problems is it does not seek the wind very well, when the wind hits it good the blades grab it and spin it up, but then it backs off when the wind changes a little. Takes a harder gust to turn it into the wind. Also it is turbulent winds, not high enough over the trailer and trees to near it.
If a set of those harbor freight type wind mill blades would spin this motor half as fast as I have seen them free spin then it would make some power, along with seeking the wind better and clean flowing air.
I had thought about putting a bearing up there and bending the blades to a better angle but I have larger project going. I just stuck that up there because it was an empty space at the time that needed something turning in it. I actually did not expect any power from it at all.