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I wonder how the limited cross-sectional area of the tunnel impacts the testing? Probably no worse or no better than wind tunnel testing.
The tunnel tunnel testing looks like a good idea to me if one wants to eliminate winds from any direction from the tests, use the actual vehicle instead of a model, and doesn't have a fortune for wind tunnel time.
Aircraft don't have to worry about yaw forces/effects unless they're interfacing or about to interface with the ground.
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