Did you ever wonder how the aerodynamic (fluid dynamic) principles were worked out in order to produce the high performance airplanes of the 50’s and 60’s were developed before the advent of computer flow models? Some of those aircraft sill hold records even today.
How did they test/teach and learn about complex problems of flow around struts, into jet inlets and over airfoils? Learn about that process here.
Flow Visualization part:1
Flow Visualization part:2