Employing variable test section porosity, computer-controlled valves, chokes and flaps, target airspeeds are easy to achieve and maintain. Using compressed air Transonic Wind Tunnels offer running speeds of M=0.3 to M=1.3. Systems with test section sizes of 8-inch x 8-inch (20.32cm x 20.32cm) and 20-inch x 20-inch (51cm x 51cm) are available.
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