Author: P. Ward BrownPublisher:
ISBN:
Category : Planing hulls
Languages : en
Pages : 153
Book Description
Directional Stability Tests of a 30 Degree Deadrise Prismatic Planing Hull
Author: P. Ward BrownPublisher:
ISBN:
Category : Planing hulls
Languages : en
Pages : 153
Book Description
Directional Stability Tests of a 30 Degree Deadrise Prismatic Planing Hull
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 216
Book Description
This is the second of four reports on research designed to obtain basic hydrodynamic information about planing hulls through the use of captive model tests. The information is to be used for the general study of dynamic stability while underway, course keeping, turning and maneuvering, etc. The models tested were of idealized patrol boats having an LBP of 100 ft., a beam of 20 ft., and a displacement of 100 long tons. The models had prismatic hull forms with 10, 20, and 30 degrees of deadrise. The report presents the results of tests on the 30 degree of deadrise hull. Most of the data is for the unappended hull. Straight course and rotating arm tests were conducted at three speeds Cv = 1.5, 3.0, and 4.01, three angular velocities LIR = 0, 0.117, and 0.234 and a single beam loading Cv = 0.4375. The tests covered the following angular parameter ranges. Trim: -2 to 6 degrees, roll: -10 to 20 degrees, and yaw: -15 to 15 degrees. Twin rudders were fined during the straight course tests at zero degrees of roll and yaw, and three degrees of trim. The effect of rudder deflection from -20 to 20 degrees was investigated. Measurements were made of the drag and side forces, and the roll, pitch, and yaw moments. Draft was recorded. Underwater photographs were taken, and the wetted lengths and areas determined from these photographs. Video recordings were made of all runs. The data are presented in extensive tables, in wind axes and body axes, and in both dimentional and non-dimensional form.
Directional Stability Tests of Two Prismatic Planing Hulls
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 392
Book Description
The first of four reports on research designed to obtain basic hydrodynamic information about planing hulls through the use of captive model tests. The information is to be used for the general study of dynamic stability while underway, course keeping, turning and maneuvering, etc. The models tested were of idealized patrol boats having an LBP of 100 ft., a beam of 20 ft., and a displacement of 100 long tons. The models had prismatic hull forms with 10, 20 and 30 degrees of deadrise. The report presents the results of tests on the 10 and 20 degree of deadrise hulls. Most of the data is for unappended hulls. Straight course and rotating arm tests were conducted at three speeds C V = 1.5, 3.0, and 4.0 three angular velocities L/R = 0, 0.117, and 0.234 and a single beam loading C delta = 0.4375. The tests covered the following angular parameter ranges. Trim: -2 to 6 degrees, roll: -10 to 20 degrees, and yaw: -15 to 15 degrees. Twin rudders were fitted during the straight course tests at zero roll and yaw angles, and the effect of rudder deflection from -20 to 20 degrees investigated. Measurements were made of the drag and side forces, and the roll, pitch, and yaw moments. Draft was recorded. Underwater photographs were taken, and the wetted lengths and areas determined from these photographs. Video recordings were made of all runs. The data are presented in extensive tables, in wind axes and body axes, and in both dimensional and non-dimensional form.
The Dynamics of Marine Craft
Author: Edward M. LewandowskiPublisher: World Scientific
ISBN: 9789810247560
Category : Technology & Engineering
Languages : en
Pages : 428
Book Description
This book presents a theoretical treatment, as well as a summary of practical methods of computation, of the forces and moments that act on marine craft. Its aim is to provide the tools necessary for the prediction or simulation of craft motions in calm water and in waves. In addition to developing the required equations, the author gives relations that permit at least approximate evaluation of the coefficients so that useful results can be obtained. The approach begins with the equations of motion for rigid bodies, relative to fixed- and moving-coordinate systems; then, the hydrodynamic forces are examined, starting with hydrostatics and progressing to the forces on a moving vehicle in calm water and (after a review of water-wave theory) in waves. Several detailed examples are presented, including calculations of hydrostatics, horizontal- and vertical-plane directional stability, and wave-induced motions. Also included are unique discussions on various effects, such as fin-hull interactions, numerical stability of integrators, heavy torpedoes, and the dynamics of high-speed craft. The book is intended to be an introductory-level graduate text and a reference for the practicing professional.
Dynamics Of Marine Craft, The: Maneuvering And Seakeeping
Author: Edward M LewandowskiPublisher: World Scientific
ISBN: 9814490067
Category : Technology & Engineering
Languages : en
Pages : 424
Book Description
This book presents a theoretical treatment, as well as a summary of practical methods of computation, of the forces and moments that act on marine craft. Its aim is to provide the tools necessary for the prediction or simulation of craft motions in calm water and in waves. In addition to developing the required equations, the author gives relations that permit at least approximate evaluation of the coefficients so that useful results can be obtained. The approach begins with the equations of motion for rigid bodies, relative to fixed- and moving-coordinate systems; then, the hydrodynamic forces are examined, starting with hydrostatics and progressing to the forces on a moving vehicle in calm water and (after a review of water-wave theory) in waves. Several detailed examples are presented, including calculations of hydrostatics, horizontal- and vertical-plane directional stability, and wave-induced motions. Also included are unique discussions on various effects, such as fin-hull interactions, numerical stability of integrators, heavy torpedoes, and the dynamics of high-speed craft. The book is intended to be an introductory-level graduate text and a reference for the practicing professional.
Proceedings of the Twenty-Third American Towing Tank Conference
Author: Robert G. LatorrePublisher: National Academies
ISBN:
Category : Hulls (Naval architecture)
Languages : en
Pages : 446
Book Description
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