Image: Don Kiddick
Pyestock Cell 4
Four main buildings made up the testing facility. Cell 4, the largest testing chamber, was constructed in 1965 at a cost of £6.5 million ($10.4 million) and was the only testing facility of its kind anywhere in the world. It was built to test Concorde and other supersonic engines and could generate wind speeds of up to 2,000 mph and match flying conditions experienced at 61,000 feet. Due to the enormous amount of energy required to power these tests, Cell 4 could only be run at night so that it didn’t overtax the local electricity grid.