When do the camber and chord lines of a wing section completely coincide? This i

Question

When do the camber and chord lines of a wing section completely coincide? This is not possible Only when the wing is infinitely thin This condition requires the section to have top-bottom symmetry such as the NACA 0012 section This condition requires the section to have fore-aft symmetry such as this section. Which of the following are true (may be more than one) The direction of the lift vector is perpendicular to the direction of the relative flow the direction of the drag vector is parallel to the direction of the relative flow and pointed downstream Lift and drag are, by definition, orthogonal to each other A conventional place to compute the aerodynamic moment of a wing section is the "quarter chord", or location on the section 25% of the way aft of the leading edge. Moments about the quarter chord will tend to vary with the angle of attack of the foil the location along the section where moments are insensitive to the angle of attack is known as the aerodynamic center, whales are fish

Explanation / Answer

1) This condition requires the section to have top-bottom symmetry such as the NACA 0012 section.
  When the camber line coincides with the chord line, the wing camber is reduced to zero and the aerofoil is symmetrical.

2)

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