A PRELIMINARY STUDY OF THE EFFECT OF THE FREE SURFACE ON THE DRAG OF A TRUNCATED 2:1 ELLIPSOID,
IOWA UNIV IOWA CITY INST OF HYDRAULIC RESEARCH
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The study of the drag force on truncated, axisymmetric, supercavitating bodies near a free surface involved the design, construction, and checking of the apparatus and instrumentation necessary to conduct the experiments. A truncated 21 ellipsoid at zero angle of yaw was chosen for the initial investigation. The drag of this body at zero angle of yaw was measured and compared with existing data for a 21 ellipsoid completely submerged. In addition, some preliminary work concerning the effect of the proximity of the free surface was performed.