Question

Define drag curve.

(a) Drag will increase rapidly at particular degree of angle of attack and overcomes the lift curve at particular degree of angle of attack

(b) Drag curve will decrease at particular degree of angle of attack and lift curve increasing at particular degree of angle of attack

(c) Drag curve remains constant and lift curve will be increasing

(d) Lift curve remains constant and drag curve will be increasing

I have been asked this question by my college director while I was bunking the class.

The doubt is from Airfoil Characteristics in section Incompressible Flow over Airfoils of Aerodynamics

Answer 1

The correct answer is (a) Drag will increase rapidly at particular degree of angle of attack and overcomes the lift curve at particular degree of angle of attack

Best explanation: The drag curve increases very rapidly at a certain degree of angle of attack and completely overcomes the lift curve at some degree of angle of attack, at this point maximum drag will be caused.so, at this point lift will drastically decrease and hence producing the drag over the body.