A large wind turbine blade is 50 m long and has a maximum chord length of 4 m at a point one-third of the way out from the wind turbine hub. When rotating at its design rate, the blade sees an air stream moving at 100 m/s at the blade tip. What is the Reynold’s number of the air flow at the point of maximum chord length? Suppose the aerodynamic properties of the blade are to be studied in a wind tunnel that can accommodate at most a blade scaled down to a length of 7.5 m. The wind tunnel operates at atmospheric pressure. To study the properties of the blade near its point of maximum chord length, what wind speed should be used in the wind tunnel?