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Refer to figure.
Choose the correct statement:
  • A
    Aerofoil 4 corresponds to line 3.
  • B
    Aerofoil 2 corresponds to line 4.
  • C
    Aerofoil 1 corresponds to line 1.
  • D
    Aerofoil 3 corresponds to line 2.

Refer to figure.

A completely symmetrical airfoil will intersect the vertical axis of the graph at the origin (0).
A positively cambered airfoil will generate more lift at the same speed (and therefore has a higher CL) than a symmetrical airfoil and therefore intersects the vertical axis above the origin (and generates 0 lift at a negative angle of attack).
A negatively cambered airfoil will generate less lift at the same speed (which translates into a lower CL at a certain speed) and therefore intersects the vertical axis below the origin.

An increased camber generates a higher value of CL at the same Angle of Attack.

Therefore, we have the following combinations:

  • Aerofoil 1 corresponds to line 3.
  • Aerofoil 2 corresponds to line 4.
  • Aerofoil 3 corresponds to line 1.
  • Aerofoil 4 corresponds to line 2.

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