I think it's called a fan and not a prop, because it's a fan and not a prop. Props employ lift like a wing. Fans are screws. It's really a spectrum where most

I think it's called a fan and not a prop, because it's a fan and not a prop. Props employ lift like a wing. Fans are screws. It's really a spectrum where most props & fans actually posess at least a little of both properties, and there are some in the middle that had to simply be called propfans.