Very in-teres-ting.
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The tunnel features a 3 feet square by 10 feet long test section with thick glass surrounding the front, back and bottom to allow for laser measurements and easy viewing. The section is large enough to observe a person swimming.
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So the top is opaque and the models are suspended upside down? What swimming strokes fit into a 3ft square?
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Any electrical current (blue) moves water over the model of a race car
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Magnetohydrodynamics? The only thing blue in the picture is the probe for the hydrogen bubbles.