What do you mean by double cambered airfoil?(a) Airfoil with flat lower surface(b) Airfoil with flat upper and lower surface(c) Airfoil with curved upper and lower surface(d) Only upper surface is curvedThe question was posed to me during an online exam.I need to ask this question from Airfoil Selection-3 in chapter Airfoil and Geometry Selection of Aircraft Design

What do you mean by double cambered airfoil?(a) Airfoil with flat lowe

1.	What do you mean by double cambered airfoil?(a) Airfoil with flat lower surface(b) Airfoil with flat upper and lower surface(c) Airfoil with curved upper and lower surface(d) Only upper surface is curvedThe question was posed to me during an online exam.I need to ask this question from Airfoil Selection-3 in chapter Airfoil and Geometry Selection of Aircraft Design
Answer» The correct option is (C) Airfoil with curved upper and lower surface For explanation: Traditionally, airfoils with only curved upper surface and flat bottom was termed as camber airfoil. However, if both surfaces are curved then, it is CALLED a double cambered airfoil. In now days not most PEOPLE use this terms but at some PLACES it is STILL in use.

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