Αποτελέσματα Αναζήτησης
29 Ιουν 2010 · There are two major dimensions of a boat hull: The length of the hull L H and length of waterline L WL . The following consist of arbitrary values to illustrate a calculated example. L H = 12.20 L WL = 12.00. Figure 1. After deciding how big a boat we want we next enter the length/beam ratio of each hull, L BR.
define boat dimensions and calculate boat parameters. explain factors interacting stability. evaluate stability of a sail boat using Dellenbaugh method. explain and estimate elements of sail boat performance. estimate boat speed and power requirements. explain structure and content of lines drawing. prepare a proposal concept design.
Hull dimensioning. Length, Draft and Beam. Length, draft, beam and mass are in fully loaded condition at this stage of dimensioning. There can be found two major lengths in a boat: length of hull L. H and length of waterline LWL. Let's put in some values to get a calculated example. LH := 12.20. LWL := 12.00. LH. Figure 1. LWL.
HULL FORM AND GEOMETRY. Be familiar with ship classifications. Explain the difference between aerostatic, hydrostatic, and hydrodynamic support. Be familiar with the following types of marine vehicles: displacement ships, catamarans, planing vessels, hydrofoil, hovercraft, SWATH, and submarines.
The prismatic coefficient is the ratio of actual underbody volume to the volume of a prism having a length equal to the DWL, and a section equal to the boat's maximum sectional area. The prismatic coefficient provides an indication of the distribution of displacement.
The formulae for these four calcs are well worth learning. They are available from any good book on boat design, such as those by Skene or Larsson and Eliasson, or you can download our PDF that explains the various Coefficients of Form .
Boat’s characteristics affecting her performance are measured. The International Measurement System (IMS) is a set of rules that defines what and how is measured on the boat. By using IMS, the complete boat can be measured, including the hull shape, appendages, propeller, stability, rig and sails.
