A hydrophobic coating/skin was tested to quantify its effectiveness as a hydrodynamic drag reduction device. PIV performed on a flat plate, with and without the coating, showed a 20% drag reduction induced by the coating. Drag measurement tests, conducted on a 3-ft-long ellipsoid model in the water tunnel, showed 14 and 10% drag reductions at 0- and 8-deg model angle of attack, respectively. Drag reduction levels drop with time, apparently approaching a limiting value after 15 min.
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