Need help. I seriously need professional help.

You could wire it backwards then install a generator from a Model A Ford as I believe they were Positive ground. But first we need more info. If it spins backwards, the hover part wont hover? If it doesn't hover, but does cut then your grass will be way too short. Or the blade spins the wrong direction? Then it hovers but your grass will get stretched and stand up nice and tall like raking old shag carpeting. Maybe the seller of the fan also has reversed blades for sale?