This project is related to vandwelling and cannabis. I would like a way to remove smoke from my motorhome without using that precious 'lectricity! I will have solar with batteries but I would like to cut my use at every point. I'm thinking about a 1-3lb weight on a rod that I could spin up and would drive a fan in a tube. I would drive it with either a metal cord attached to some gears that drive the shift, or a lever, but that would be more obtrusive in the space.