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.

peterpan2014-03-18T09:25:21Z

Favorite Answer

Bernoulli equation
the pressure difference between upper and lower side is
Δp=1/2ρ(vu^2-vd^2)
Δp=0.5*1.29(50^2-40^2)=580.5 Pa
the lift force is
F=Δp*S
F=508.5*30=17,415 N

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