AEDC von Karman Facility Posted bysaemiller May 30, 2022May 29, 2022 A hypersonic wind tunnel nozzle at AEDC (von Karman Facility) made from two opposed flexible plates. The large area ratios required for hypersonic velocities lead to very small nozzle throats and widely flaring nozzle walls downstream. (Photo, USAF Arnold Engineering Development Center)