... of the effects of different towing methods on planing boat model accelerations. A four foot long planing hull was tested in calm water and in waves using three different towing methods: - Traditional heave post with model towed at constant velocity - Self-propelled model mounted on a lightweight free-in-surge...

... the hydrodynamic studies have being done in support of this novel AUV design and development. vehicle shaft speed hull reynolds number effect propeller performance coefficient simulation vector underwater vehicle propeller correction body-fixed frame equation rudder rudder angle appendage...

... Open water tests of a surface piercing propeller with a pitch to diameter ratio of 1.9 have been performed in a non pressurized towing tank. Flow visualizations of the ventilated cavities formed behind the propeller and Shaft line force/torque measurements were taken at tip immersion ratios...

... of this unique experiment. hull requirement experiment deckhouse section ddg 1000 deckhouse code 5500 autopilot water management surface warfare center carderock division maneuver internal structure nswccd propeller test site basin scale ddg 1000 patuxent river DDG 1000 Large Scale...

... of all researchers involved in ship performance assessment. ship wave buoy experiment iot lauzier correlation dimension freight & logistics services tolerance propeller marine transportation instrumentation shaft negative impact torque shaft speed propulsion trial strain gage...

... Positioning (DP) thruster wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster far wake velocity components...

... Testing in the Robinson Model Basin (RMB) has long been a supplement to Webb Institute’s academic program, providing students with a comprehensive education in naval architecture. Since the theory and design of propellers is an integral part of an education in naval architecture, utilization...

... This paper describes the experimental model designed and built at Institute for Ocean Technology (IOT) to measure the ice performance of the podded propulsors in the ice tank. The model is capable of measuring forces and moments on the overall system, propeller shaft bearing loads and the loads...

... Helicopters achieve three-dimensional flight using a rotor capable of both collective and cyclic pitch. It was proposed that this type of propulsion system could propel and maneuver an underwater vehicle. A collective pitch and cyclic pitch propeller (CPCPP) was designed and developed as a full...

... Propeller tunnels fitted to high-speed yachts are becoming more prevalent. The advantages of reduced operating draft or the possibility of using larger propellers are attractive to the boat builder. This paper examines the effects of propeller tunnel applications on propeller cavitation...

... The propulsion factor called thrust-deduction fraction, t, trets the interaction of the propeller with the hull when the ship is underway and is an important element in determining the propulsive performance of a vessel. The reduced pressure field created by the propeller at the stern of a ship...

... An iterative technique for the prediction of the performance of two-component propulsors, includ­ing the effects of sheet cavitation, is presented. A vortex-lattice method, originally developed for the prediction of the performance of cavitating single propellers in non-axisymmetric inflow...

... circulation vorticity plane cavitation variation core radius perpendicular vortex piv image propeller inception ldv measurement tangential velocity quantity rotor core size leakage vortex 1 PIV MEASUREMENTS OF A TIP LEAKAGE VORTEX Carolyn Q. Judge, Ghanem F. Oweis, Steven L. Ceccio...

... Until recently, model propellers tested at the US Navy's David Taylor Model Basin (DTMB) incorporated relatively sharp trailing edges without fall scale features such as anti-singing trailing edges. These propellers have shown good agreement between design calculations and model measurements...

... inch tunnel propeller diffuser tunnel test facility diameter pressure range instrumentation reservoir characterization contraction ratio lcc evolution model basin STATE OF THE ART- CAVITATION TEST FACILITIES AND EXPERIMENTAL METHODS By ROBERT J. ETTER David Taylor Model Basin Carderock...

... in terms of drag coefficient and pod residuary resistance. The model powering tests form a data base for estimating thrust deduction and wake fraction. Podded propulsion frees the designer from the constraints imposed by the traditional propeller support arrangements to offer advantages with regard...

... horsepower contribution risk and uncertainty assessment full-scale prediction prediction-uncertainty uspeed utorque correlation allowance thrust propeller uthrust GLOBAL UNCERTAINTY ANALYSIS OF FULL-SCALE SUBMARINE PROPULSION PREDICTIONS USING TOW-TANK MODEL TESTS M.R. Pfeifer, J.R. Lee, F...

... An Euler solver, based on a finite volume approach, is developed and applied to the prediction of the effec­tive wake for propellers subject to non-axisymmetric inflows. The method is coupled with an existing lifting-surface vortex-lattice method for the analy­sis of unsteady cavitating...

... improvement variation separation foil vortex cavitation coefficient elastically coupled composite material marine transportation cavitation coupling inception deflection upstream oil & gas propeller loading cavity geometry reduction HYDROFOIL CAVITATION IMPROVEMENTS WITH ELASTICALLY...

... In order to develop a rational model for ship maneuvering, a series of model tests was conducted to isolate forces on the hull, propeller and rudder, and to study the interactions between them. Rotating arm and linear towing tests were conducted on a large Mariner model, and a systematic series...