The drag on a 2-m. diameter satellite dish in an 80 km/hr wind is to be determined by a wind tunnel test using a geometrically similar dish with diameter 0.3 m. Use standard air for both the prototype and model.
a. What air speed should be used for the model test to ensure dynamic similarity?
b. If the design load on the prototype is 500 N, what will be the measured drag (N) on the model? What model design problem does this illustrate?