DC cyclones are built with either right or left inlets. The vortex effect you are describing has to do with the rotation of the earth. This rotation is mechanically induced. Thought question: If a ship has a northern hemisphere toilet, will it work in southern hemisphere? What happens to a cyclone if it crosses the equator? Once on New Years Day of all days, one of the morning TV shows did a thing on toilets. They did a live from a toilet in Aussie land. Yep it flowed down backwards from here.Either the picture is reversed, or the air flow is backward, it should spin the other way. every thing in the northern hemisphere spins the same direction, hurricanes, toilets, bath drains, tornadoes, cyclones. vacuum cleaners, etc.
Don, that's some good info - thanks for sharing. What were the results of your tests with the oak?
Scott