Problem 3: An aero plane wing is designed so that when the speed of the air across the top of the wing is 450 ms-1, the speed of air below the wing is 410 ms-1. What is the pressure difference between the top and bottom of the wing?
Given data Speed of air on the top of the wing = v1 = 450 ms-1
Pressure on the top of the wing = P1 (say)
Speed of air on the bottom of the wing = v2 = 410 ms-1
Pressure at the bottom the wing = P2 (say)
Required P2 – P1=?
Formula Bernoulli’s equation (assuming there is no significant difference in the height h of the two sides of the wing) given by
We know the density of air = ρ = 1.29 kg m-3
Put all these values in the formula.