Ludwig Prandtl, a Bavarian engineer, teacher, and aerodynamicist, developed several important aerodynamic theories. In 1904 he described his boundary layer theory in Ueber Flussigkeitsbewegung Bei Sehr Kleiner Reibung (Fluid Flow in Very Little Friction). Prandtl's paper lead to a better understanding of skin friction drag and how streamlining reduced drag on a wing. Prandtl's work in fluid mechanics also helped develop theories on flow separation, induced drag (vortex drag), subsonic airflow, and supersonic airflow.
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Aerodynamics