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Well,
Hucho states that buses can experience up to 6 times the drag in a tunnel compared to the open road and we know that proximity to the ground is a major drag problem so I would think that a wall or divider would have a similar effect.
Six times is a whole bunch of extra drag! Of course there would be a reduced effect for smaller vehicles in the same tunnel. A wall on one side would have a smaller effect as well but depending on the proximity it could be meaningful.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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