Question

Define stalling angle in the graph.

(a) The curve increases maximum at a particular section and decreases rapidly in the same section

(b) The curve increases at different section and decreases rapidly at different section

(c) The curve remains constant at all section

(d) Lift curve will increases and drag curve will remain constant

I got this question at a job interview.

Query is from Airfoil Characteristics in portion Incompressible Flow over Airfoils of Aerodynamics

Answer 1

The correct choice is (a) The curve increases maximum at a particular section and decreases rapidly in the same section

Easy explanation: The lift curve reaches its maximum for any wing section at certain degree of angle of attack and then rapidly decreases at some degree of angle of attack is therefore the stalling angle. Stalling will occurs at particular degree were the maximum lift will be achieved by the aircraft at that point stalling will takes place.