Check the listing for details. 56 Page 1933 Characteristics 78 Related Airfoil Sections Wind Tunnel Study on CD. Condition: New. Listed at 12.99 USD. An investigation of a large group of related airfoils was made in the NACA variable-density wind tunnel at a large value of the Reynolds number. The tests were made to provide data that may be directly employed for a rational choice of the most suitable airfoil section for a given application.