Principles of Flightmedium#515
Interference drag is caused by:
A
Wing dihedral
B
Propeller slipstream
C
The junction of two aerodynamic surfaces (e.g., wing-fuselage) creating disturbed airflow
CorrectD
Aileron deflection
Explanation
Interference drag arises at the intersection of components (wing-fuselage, engine-pylon) where airflows interact unfavorably.
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