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.