What is the lift force on the airfoil due to the moving air?

The speed of air moving over the top of a thin airfoil, such as an airplane wing, is 50 m/s. The speed of air moving under the airfoil is 40 m/s. If the area of the surface is 30 m^2, what is the lift force on the airfoil due to the moving air.

Assume air has a density of 1.29 kg/m^3.

Woodsman2014-03-21T08:09:17Z

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Lift = ½Aρ(U² - V²)
where A = area of wings
and ρ = density of medium
and U = velocity over upper surface
and V = velocity over lower surface.
Then lift = ½ * 30m² * 1.29kg/m³ * ((50m/s)² - (40m/s)²) ≈ 17 kN

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