Just got my wonderful wind tunnel in from Pitsco, the X-stream wind tunnel. It has a probe that measures how much drag force is experienced by objects in the tunnel. The wind speed measurement uses the fact that there is a Venturi tube shape in the tunnel itself. As a result, you can get the volumetric flow rate in the wind tunnel from the difference in pressure between the wide mouth and the narrow test area. It uses a manometer that is marked off in thousands of inches/minute. I am now gleefully gathering labs and lectures for the Aerodynamics course from MIT's lecture series. More later.