NASA wind tunnel actuators shaping a de Laval nozzle.
https://diqn32j8nouaz.cloudfront.net..._actuators.jpg
Previously:
https://www.homemadetools.net/forum/...304#post131095
https://www.homemadetools.net/forum/...298#post135015
https://www.homemadetools.net/forum/...874#post152596
https://www.homemadetools.net/forum/...493#post110756
