Tow tank just requires a lot of length, recirculating tanks not as much...
Thankfully we have access to a couple 3d printers so models won't cost quite so much... making them not float away and getting some data however, could be more challenging in water...
I've found tons of NASA and *IT articles on water tanks, but most gloss over the dimensions, is there a frontal area to tank cross section or similar rule?
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