Waterplane Sheet (English Units)
Description:
For a given input waterline this spreadsheet
computes hydrostatic waterplane area characteristics
relating to station half beam inputs. Basically it sums the
area under a half beam (or waterline) curve to obtain the waterplane area,
it takes moments to obtain the longitudinal center of floatation and
computes moments of inertia in both the transverse and longitudinal
directions.
If the input waterline is level, the data obtained may be used as an
input source for a vessel's "Curves of Form." Inputs are
based on a Lines Drawing with ten stations starting at zero and ending at
Station Ten. This Lines Drawing has customary half stations at each
end to compensate for vessel fineness. The numerical integrations
contained in these calculations are based on Simpson's Rules.
Though optional, this spreadsheet is best utilized in
conjunction with a Displacement
Sheet (Product Disp-e)
and Waterline Input/Output Sheet (Product
WL-IO-e).
A further enhancement is dynamically combining this sheet along with a
Displacement Sheet and a Waterline Input/Output Sheet. The product that combines
all these sheets together is called a Waterline Hydrostatics Data Sheet
(Product WL-hydro-e). This
later enhanced combination facilitates faster and easier
computation for a given waterline. In the combined case, calculations
are more automated, significantly minimizing the data entry input time.
Electronic
Document Type: Microsoft® Excel®
spreadsheet Cost:
$7.50 US funds
Number of
Pages: Includes an template (or input)
sheet, along with an example sheet, an instructions
sheet and a use terms sheet.
Inputs:
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The following dimensional and property input data are required:
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Clearly document the WL condition being evaluated.
Enter the forward draft (TFWD), midships draft
(TMID), aft draft (TAFT) and
maximum draft (T). |
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Then enter
the
station spacing (s).
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Enter in half beams (y)
for each station.
Note the vessel must be divided into ten stations (this yields
eleven half beams) with a half station at each end (this adds two
more half beams). This means a total of thirteen input cross
half beams are required. |
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For vessel's with overhang; add in the aft
overhang waterplane surface area as well as the
longitudinal center of area for this surface from Station 5.
The longitudinal and transverse moments of inertia for this
overhang area are also required. This data is often needed
because many vessels that end their LBP (in the Lines Drawing) at
the center of the rudder post. This correction compensates
for the area that is aft of the rudder post, which may be
substantial. |
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Optional Input Items:
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Vessel name, project description, client and
calculation date and time. |
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Outputs:
| The
automatic output generated by this spreadsheet are the
waterplane area (A),
Longitudinal center of floatation (LCF),
longitudinal moment of inertia about the LCF
(ILCF),
and Transverse Moment of Inertia about Centerline (IT).
Note the LCF obtained is the distance from Station 5. |
Suggested
Reading (see
References page for
more detail on these items):
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Microsoft Excel user manuals |
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Principles of Naval Architecture, Edward V. Lewis, SNAME |
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Basic Ship Theory, Rawson & Tupper |
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Applied Naval Architecture, Robert B. Zubaly |
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Introduction to Naval Architecture, E. C. Tupper |
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Introduction to Naval Architecture, Thomas Gillmer and
Bruce Johnson |
Terms:
Prior to purchase, read our
End
User License Terms.
Download
Now:
Click one of the following buttons to pay.
After payment you will be taken directly to the download page.
Minimum
System Requirements: Windows 95/98/NT/2000/XP
Sample:
A sample document is shown below.
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