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The induced angle of attack for an elliptical lift distribution increase when ______

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The induced angle of attack for an elliptical lift distribution increase when ______

(a) Lift decreased

(b) Aspect ratio decreased

(c) Decrease in planform area

(d) Increase in span length

The question was asked during an online exam.

Origin of the question is Prandtl’s Classical Lifting-Line Theory topic in section Flow over Airfoils over Finite Wing of Aerodynamics

1 Answer

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Best answer
The correct choice is (b) Aspect ratio decreased

The best explanation: If we decrease the planform area or increase the span length, the aspect ratio increases. Since the induced angle of attack is indirectly proportional to the aspect ratio, these options are wrong. We need to decrease the aspect ratio to increase the induced angle of attack. Increasing the lift can also increase the induced angle of attack.

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