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Myth-Busters
Vekke,did you happen to catch the Myth-Busters episode in which they tested pickups for tailgate up/down fuel economy?
In that episode they constructed a simple 'atmospheric' open-top water tunnel which looked akin to a horse race track.
A 24-VDC electric trolling motor was used to move the water.
A clear Plex window allowed viewing of the model pickup as the water flowed by.
And they simply put something like breakfast cereal in the water to reveal what the flow was doing in proximity to the model.
With the grain in the water you could clearly discern the open pickup truck bed 3-D vorticity as is depicted in CFD images.
Dirt simple technology!
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