Input/Output, Hydrostatics for One Waterline (U. S. A. Units)

Description: This spreadsheet automatically computes hydrostatics characteristics for one waterline.  If the waterline is level this data may be used as an input source for the vessel's "Curves of Form."
     Though optional, this spreadsheet is best utilized in conjunction with a Displacement Sheet (Product Disp-e) and a Waterplane Sheet (Product WP-e).  A further enhancement is combining this sheet with a Displacement sheet and a Waterplane sheet.  In fact a product is available that combines all these sheets together, it is called Waterline Hydrostatics Data Sheet (Product WL-hydro-e).  This combination facilitates faster and easier computation for a given waterline.  In the combined case calculations are more automated, significantly minimizing entry input time.

Electronic Document Type:  Microsoft Excel spreadsheet           Cost: Free

Number of Pages: single sheet                        

Inputs:  

• The following dimensional and property input data are required:

  • Define the WL condition to be evaluated by entering the forward draft (T_FWD), midships draft (T_MID), aft draft (T_AFT) and maximum draft (T).

  • Then enter in the waterline length (LWL), waterline beam (BWL), station spacing (s) and maximum hull cross sectional area (SA) below the waterline.

  • Then enter in the specific gravity (S) of the water that the vessel is in. If this is in regard to a stability test enter the average specific gravity taken at the time of stability test.

• Items related to sectional area inputs:

  • Enter in the displaced volume (V), displacement (D), Longitudinal Center of Buoyancy (LCB) and vertical center of buoyancy (VCB).  This data is normally obtained from a displacement sheet which involves sectional area characteristics. Hawaii Marine's displacement sheet, product Disp-e, would work here. Alternatively calculative results obtained by hand calculations, CAD output or another source may inserted here.

• Items related to half breadth inputs:

  • Enter in the waterplane area (AWP), longitudinal center of floatation (LCF), longitudinal moment of inertia (ILCF) and transverse moments of inertia (IT).  This data is normally obtained from a waterplane sheet which involves half beam characteristics. Hawaii Marine's waterplane sheet, product WP-e, would work here. Alternatively calculative results obtained by hand calculations, CAD output, planimeter or some another source may inserted here.

• Optional Input Items:

  • Vessel name, project description, client and calculation date.

Outputs:  

• The automatic output generated are the tons per Inch (TPI), longitudinal metacentric radius (BML), transverse metacentric radius (BMT), distance from keel to longitudinal metacenter (KML), distance from keel to transverse metacenter (KMT), bock coefficient (CB), prismatic coefficient (CP), and miship's coefficient (CM).

Suggested Reading (see References page for more detail on these items):

• Microsoft Excel user manuals

• Principles of Naval Architecture, Edward V. Lewis, SNAME

• Basic Ship Theory, Rawson & Tupper

• Applied Naval Architecture, Robert B. Zubaly

• Introduction to Naval Architecture, E. C. Tupper

• Introduction to Naval Architecture, Thomas Gillmer and Bruce Johnson

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Minimum System Requirements: Windows 95/98/NT/2000/XP/Vista/Windows7/later Windows OSs including Windows 11

Sample: A sample document is shown below.