The exhaust / cooling end of the most powerful wind tunnel the world has ever known. The grid of pipes at the end were filled with chilled water to help cool the exhaust fumes and the rods sticking into the tunnel were kind of like bunsen burners, designed to ignite any remaining fuel particles that did not get burned up in the engine capsule behind me.
Concorde's Olympus engines were tested at mach 2 and at the correct atmopheric pressure for 60000 feet in this cell. Along with many other military fighters.

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