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Aerodynamic Testing 209
Fig. 8.11. Test section of the NASA Ames 80 120 open-circuit wind tunnel.
(Photo courtesy of NASA.)
particularly in supersonic wind tunnels. Keeping the test The Wright brothers were not
section at ambient pressure allows the use of windows for the first to use a wind tunnel.
view and photographing the model. Exceptions to this are However, they were the first to
highly specialized tunnels that have pressurized test sections use it for the purpose of
to increase air density. understanding flight.
