1. The problem statement, all variables and given/known data Determine the speed of air at 1,2,3,4 mm from the middle of a wind turbine blade at a section 4 meters from the hub, given that the free stream velocity is 7 m/s and the turbine is moving at a speed of 18 RPM. The air temp is 27 degrees c. The length of the aerofoil is 8 meters long at a section 4 meters from the hub. Use the parabolic equation from the boundary layer theory. 2. Relevant equations Parabolic equation 3. The attempt at a solution 0.3 m/s @ 1mm 0.58 m/s @ 2mm 0.88 m/s @ 3mm 1.16 m/s @ 4mm I would highly appreciate your expert advice if my answer's are correct please. Thank you in advance.