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Ground effect (aerodynamics)

What is the primary reason for the reduced aerodynamic drag experienced by fixed-wing aircraft in ground effect?

Parasitic drag

What is the type of aerodynamic drag that arises from the friction of the fluid against the 'skin' of the object moving through it?

Zero-lift drag coefficient

What does the zero-lift drag coefficient reflect in an aircraft's aerodynamics?


How do wingsails adjust camber to optimize efficiency?

Lift-to-drag ratio

What is the lift-to-drag ratio (L/D ratio) used to describe in aerodynamics?

Lift (force)

Which force is defined to act perpendicular to the flow and can act in any direction?


What was the main goal of the Prandtl-D design?