The practice of low-speed experimental aerodynamics has continued to evolve andcontinues to be a cornerstone in the development for a wide range of vehiclesand other devices that must perform their functions in the face of forces imposedby strong flows of air or water. In the 1970s and continuing into the early 1980s asizable group of experts predicted that the need for aerodynamic experiments,particularly in the subsonic regime, would rapidly disappear as computational fluiddynamics would in a rather short time become sufficiently capable so that allneeded information would be available from computational simulations at a costeffectivenesssuperior to that of experiments. It is true that computational capabilityhas continued to improve at a substantial pace, but it has not come close to reachinga level sufficient to replace the need for experimental data in development projects.There are now no credible predictions that computational simulation will replacethe need for all data from physical experiments in any significant developmentprojects. Turbulence continues to confound us in many respects.