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We experimentally studied the effect of flexibility on the flow produced bysinusoidally pitching foil in quiescent fluid. The rigid foil produces a weak,divergent and meandering jet. On the contrary, the foil with a flexible flapproduces an orderly, narrow, coherent jet. It has been observed that suchorderly jet is produced when the flap has appropriate flexibility. The jetproduced in quiescent fluid by the flexible foil is accompanied by acorresponding thrust. In that sense, this is simple and different type ofhovering.

A Pitching Foil with a Flexible flap Creates an Orderly Jet