HYDRODYNAMIC CHARACTERISTICS OF BASE-VENTED AND SUPERCAVITATING STRUTS FOR HYDROFOIL SHIPS. VOLUME I. TEXT AND APPENDIXES.

Abstract : The experimental program consisted of two phases: a basic strut investigation, and a study of the effect of rudders on a selected strut. The basic strut investigation consisted of (1) exploratory tests in which the experimental techniques and equipment were checked out, and a comparison made of results obtained with a straight model and with a model curved to the towing radius; (2) a study of drag optimization of basic sections; (3) cross force and yaw moment studies; (4) an evaluation of the effect of strut geometry (thickness ratio and rake); and (5) a study of the e ehhee effect of scale (size and speed) as represented by Froude number. The rudder study was concerned with the effect of rudder geometry (i.e., chord ratio, span ratio, and spanwise location of the rudder) on a selected strut section.