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@gbj_tester
Unless upsidedown is going faster than I think, he won't need to worry about compressibility, so he just has to adjust his speed in the pool to achieve the same Reynolds number as he has in air at cycling speed to get useful results. Unless somebody tips a few tons of cornflower into the pool and turns it into a non-Newtonian fluid
http://www.youtube.com/watch?v=D-wxnID2q4A