The drag characteristics of a blimp 4 m in diameter and 50 m in length are to be examined in a wind tunnel with a 1/10 scale model. If the speed of the blimp through still air is 8 m/s, what airspeed...

The drag characteristics of a blimp 4 m in diameter and 50 m in length are to be examined in a wind tunnel with a 1/10 scale model. If the speed of the blimp through still air is 8 m/s, what airspeed in the wind tunnel is needed to satisfy the conditions of similarity? Consider the air pressure and temperature to be the same in both the model and prototype.