Please scroll down to page 14 of:
http://www.deoud-hagenaar.nl/2009/04/28/de-oud-hagenaar-2009-7/
The video Streamlines by Chevrolet is a well-worth watching. In it you will learn about wind tunnel testing and also view an interesting demonstration of a device that uses a liquid and aluminum powder to show the effect different shapes have on streamlining.
https://www.retromobile.com/Visitors/Exhibitions-and-events/Events-2020/Tatra-A-small-manufacturer-and-a-great-history
Video: https://www.youtube.com/watch?v=oMc2QmU1kWE https://www.autoplus.fr/actualite/Retromobile-2020-Programme-Tatra-Exposition-Camions-1545312.html
The exhibition has been realised with the help of Tatra Museum koprivnice, Ecorra, the manoir Museum de l’Automobile of Brittany, Vladimir Cettl who will exhibit some of his photos and the Museum of Zlin with photos and viedeos of the Hanzelka / Zikmund journeys.