Accession Number : AD0411649

Title :   INTERFERENCE EFFECTS OF A SUBMERGED HYDROFOIL ON A SURFACE-PIERCING STRUT,

Corporate Author : STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB

Personal Author(s) : Chey,Y. ; Kowalski,T.

Report Date : JUN 1963

Pagination or Media Count : 1

Abstract : In the design of high-speed hydrofoil craft in tended for operation in rough ocean waves, controllable submerged hydrofoils are normally attached to the hull through systems of surface piercing struts. The studies described were initiated to obtain information on the inter ference effects of the submerged finite aspect ratio hydrofoil on the surface-piercing strut. A model of a single strut to which the hydrofoils of several aspect ratios were attached perpendicu larly was used in the experiment. The presence of the submerged hydrofoil with zero attack angle increased the side force on the strut by approximately 15%. The submerged hydrofoil also increased the drag of the strut and the roll moment of the strut-foil system. As the hydro foil attack angle increased, the increments of side force, drag and roll moment decreased. Recommendations are given for further study of the forces and moment equilibrium and structural considerations of the hydrofoil strut system with controllable lift surfaces during maneuvering operation of the craft. (Author)

Descriptors :   (*HYDROILS, DESIGN), (*MODEL, ANALYSIS), AERODYNAMIC CONFIGURATIONS, FAIRINGS, DRAG, ROLL, YAW, STRUCTURES, PARTIAL, HYDRODYNAMICS, ASPECT, MOMENTS, ANGLE OF ATTACK, HYDRODYNAMIC

Distribution Statement : APPROVED FOR PUBLIC RELEASE