Spray Drag of Surface-Piercing Struts
Research and development rept.
NAVAL UNDERSEA RESEARCH AND DEVELOPMENT CENTER SAN DIEGO CA
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Spray drags were measured using a series of nine surface-piercing struts operated in fourteen configurations. Empirical equations were deduced and compared with earlier data. The strut surface-area wetted above the waterline by the spray sheet was determined from photographs of various configurations and used as evidence that the frictional drag of the spray sheet flowing over the strut was the primary source of the measured spray drag. The mass flow rate contained in the spray sheet was measured indirectly. Following these experiments horizontal spray rails were attached to three of the struts and produced significant reductions in the spray drag of each.
- Marine Engineering
- Fluid Mechanics