In Case You Missed It
Wind Tunnel
When the airflow separates from a surface, the result can be unsteady forces or turbulent wake shedding, neither of which is desirable.
Wind Tunnel
Contrary to popular belief, the frontal area of an airplane is not the most important determinant of drag.
Engine Beat
Exhaust systems do more than just get air into and out of aircraft engines. Exhaust system design, in terms of exhaust pipe length, diameter and tuning, affect the efficiency and performance of the engine, for better or worse.