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Effects of Mid-chord Flaps on the Ventilation and Force Characteristics of a Surface-piercing Hydrofoil Strut

John J. Nelka

出版	Naval Ship Research and Development Center, 1974
URL	http://books.google.com.hk/books?id=Lt9kNwAACAAJ&hl=&source=gbs_api

註釋

Ventilation and side force characteristics of a NACA 16-012 strut with span-wise mid-chord flaps attached from 0.5 to 0.7 chord were determined. This strut configuration represented a strut system with retractable mid-chord flaps in the extended mode. Experimental results showed that such a strut system exhibits the advantage of a streamline strut at preventilation speeds (low drag) and the advantage of a blunt-based strut at ventilation/post-ventilation speeds (no side force reversal).