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ceiling height
At the article website there are a number of photos of the tunnel.
One shows Nina crouching at the tunnel nozzle jet with smoke wand and model.You can see that the nozzle is probably only as tall as Nina.
The test section is 'open' and enormous,but the model is only occupying no more than 5% of the jet cross-sectional area.(outlined in blue)
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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