Definition
A form of aerodynamic drag that appears at transonic and supersonic speeds, caused by the formation of shock waves on the aircraft. Energy from the airflow is lost in compressing the air across the shock wave, producing a sharp rise in total drag that is not present at lower speeds.
Plain English
Extra drag that shows up when the aircraft gets near or past the speed of sound, because shock waves form on the airframe and steal energy from the airflow.
Context Anchor
Seen in high-speed flight discussions, especially when learning about shock waves, transonic flight, and why drag rises sharply near the speed of sound.
Derivation
Named after the shock waves that cause it. The drag is the direct result of those waves forming on the aircraft, so the airflow penalty is literally drag from the wave.
Why Pilots Care
It sharply increases total drag near the speed of sound, limiting performance and requiring design features like swept wings or area ruling.
Grounding Statement
Picture the air no longer flowing smoothly out of the airplane’s way; sharp pressure waves form, and making those waves costs energy.
Intuition Check
Do not think of wave drag as drag from turbulence or from air moving up and down like ocean waves. Here, “wave” means a pressure wave in the air, usually connected with very high-speed flight.
Example Sentence 1
As the aircraft accelerated through the transonic range, the crew saw a clear rise in fuel flow caused by wave drag.
Example Sentence 2
Designers shape the fuselage to lower wave drag in the range near the speed of sound.