A 1/5 scale model of a torpedo is tested in a wind tunnel to determine the drag force. The prototype operates in the water, has 533 mm diameter and 6.7 m length. The desired operating speed of the prototype is 28 m/s. To avoid the compressibility effect in the wind tunnel, the minimum speed is limited to 110 m/s. However, the pressure in the wind tunnel can be varied while holding the temperature constant at20 0C. At what minimum pressure should the wind tunnel be operated to achieve a dynamically similar test? At dynamically similar test conditions, the drag force on the model is measured as 618 N. Evaluate the drag force expected on the full-scale torpedo.
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