Principles of Flightmedium#591
Wave drag appears at transonic speeds due to:
A
Surface roughness
B
Wingtip vortices
C
Energy lost in the formation of shock waves on the aircraft surface
CorrectD
Propeller effects
Explanation
Wave drag is the energy dissipated by shock wave formation as local airflow exceeds Mach 1.0 on parts of the aircraft.
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