Dimensional analysis and hydraulic similitude

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Using Eq. (4), the drag force on the prototype is estimated as,

Example-2: A sonar transducer is a prototype sphere 0.3m-diameter towing at 9km/hr in seawater at 5⁰C. The drag on this transducer is to be predicted from wind tunnel data on a model of 15cm diameter. Determine the required test speed in the wind tunnel. If the drag of the model at test condition is 25N, estimate the drag on the prototype.

Solution:

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