Very nice Goaly!
they make motors just for that type of fan,not a prop but it powers multi fans from a single location. They are generally belt driven and used for commercial or industrial applications.
The wheel chair motor should work but isnt it a DC motor? you'll need a converter or power it with a battery.
I would think any 1/2hp AC motor would do the job and you can use pulleys to get the proper rpm.
Cant wait to see it finished!
