Downwash for an elliptic wing circulation distribution is constant.

A. True

B. False

I got this question in semester exam.

Query is from Prandtl’s Classical Lifting-Line Theory topic in division Flow over Airfoils over Finite Wing of Aerodynamics

Correct option is A. True

The best explanation: For an elliptic distribution of lift over the span of a wing, downwash is a constant. This can be calculated from Biot-Savart law and using substitution to reveal that downwash is a constant along the span.