Pressure on the upper surface is _________(a) lower than lower surface(b) higher than lower surface(c) always 30.25 times lower surface(d) always sameThe question was asked in an internship interview.This is a very interesting question from Airfoil Selection-3 in division Airfoil and Geometry Selection of Aircraft Design

Pressure on the upper surface is _________(a) lower than lower surface

1.	Pressure on the upper surface is _________(a) lower than lower surface(b) higher than lower surface(c) always 30.25 times lower surface(d) always sameThe question was asked in an internship interview.This is a very interesting question from Airfoil Selection-3 in division Airfoil and Geometry Selection of Aircraft Design
Answer» The correct CHOICE is (a) lower than lower surface The EXPLANATION: Pressure on the UPPER surface of an airfoil is lower than that of the lower surface. This will provide pressure difference which will generate lift force. Pressure will be the same if AOA is 0° in case of SYMMETRIC airfoil.

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