The speciality of the aerofoil is always the upper camber is longer than the bottom camber.For air molecules to flow from A-B along the upper camber and bottom camber time is equal.As upper camber is longer than the bottom camber the velocity of airflow over the upper camber is higher than the velocity of airflow along the lower camber.According to the Bernoulli's principal outcome pressure of the upper camber is lower than the pressure of the lower camber.Therefore when air is flowing across an aerofoil plane will be lifted.Therefore all aircraft wings are made out of aerofoil shape.
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