On the Motions of High Speed Planing Craft
The first part of the study presents a simple method, based on the known results of airfoil theory, of estimating the hydrodynamic characteristics of high speed planing craft. Comparisons between present calculations and experiments for flat and prismatic surfaces in steady triming, rolling and yawing attitudes are made. The calculations seem generally to be in good agreement with the data. The second part of the report discusses the turning and stability of planing craft. The governing equations, based on the kinematics and dynamics of rigid bodies are in many respects similar to that given for hydrofoil boats. Once the hydrodynamic characteristics are known the stability and turning performance of craft can be assessed with the aid of these equations. (Author).
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20 angle 9 cos cp 9 sin cp airfoil airfoil theory ANGLE OF DEAD-RISE angular aspect ratio wing Attn Beranek and Newman Bethlehem Steel Company body axes buoyancy Calculated and Experimental Calif California center of pressure Code Commander U. S. Naval Commanding Officer Office Comparison of Calculated Dead-Rise Figure Dept Director U. S. Navy due to cross-flow Engr Equations l6 estimating the hydrodynamic EXPERIMENTAL LIFT COEFFICIENTS fluid forces and moments high speed planing hydrodynamic characteristics hydrofoil HYDRONAUTICS inertia of craft Institute keel Laboratory mean wetted length motion NACA Naval Architecture Naval Research Branch Naval Shipyard Navy Washington normal force Office of Naval port panel prismatic surfaces Prof Research Branch Office roll and yaw SAVITSKY Security Classification speed planing craft SPONSORING MILITARY stability derivatives trailing edge turning and stability UNCLASSIFIED University velocity components wing yaw angles z-axes respectively