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Fig. 12. The drag/wave drag [Cd/(d/l)2] of a streamlined object moving at a depth (h) relative to its length (l) as a function of the Froude number (Fr). The arrows (black, synchronous kicks; gray, asynchronous kicks) indicate the average Froude number at which the frog swims during asynchronous and synchronous kicking, calculated from the velocity (U) and length of the outstretched frog at the end of the kick. Graph modified from Hoerner (1965). g, gravitational acceleration.





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