Human efforts to conquer flight, land on the moon, go beyond the earth and discover new universes would have been difficult without the development of wind tunnels. The early 18th and 19th century aerodynamists used whirling arm to study various shapes which suf‐ fered from a major fault that the body under investigation was forced to fly in its own un‐ disturbed wake. This has lead to the development of wind tunnels to overcome the problem.