Hydrostatics for One Waterline (English
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." If
the waterline is not level (and/or includes sag or hog) this template can
also be used. It is ideal for cases where the vessel exceeds the one
percent allowable trim at a stability test (inclining experiment).
This spreadsheet combines the three Hawaii Marine
Templates into one. These are the Displacement Sheet (Product
Disp-e), the Waterplane Sheet (Product
WP-e) and the
Waterline Input/Output Sheet (Product
WL-IO-e). This combination facilitates faster and easier
computation for a given waterline. These combined case calculations
are more automated, significantly minimizing entry input time.
Electronic
Document Type: Microsoft® Excel®
spreadsheet Cost:
$15.00 US funds
Number of
Pages: single
sheet
Inputs:
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The following dimensional and property input data are required
on Sheet 1:
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The vessel name, project description,
client name and calculation date. |
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Define the
WL condition to be evaluated by entering
the forward draft (TFWD), midships draft
(TMID), aft draft (TAFT) and
maximum draft (T). |
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Then enter
in the waterline length (LWL), waterline beam (BWL),
station spacing (s) and maximum hull cross sectional
area (SA) below the waterline. |
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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. |
|
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The following sectional area dimensional input data are required
on Sheet 2:
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Enter in half the hull's
cross sectional area (SA) for each station.
Note the vessel must be divided into ten
stations (this yields eleven cross sectional areas) with a half
station at each end (this adds two more cross sectional areas).
This means a total of thirteen input cross sectional areas are
required. Bonjean Curves may be used to quickly determine
the cross sectional areas. They also may be determined by
calculation, a CAD program or some other means. |
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For each cross sectional area the vertical
distance from the Baseline to the centroid of each cross
sectional area is required. For the template this value
is called a vca and thirteen of these values are required.
These values may determined using a Lines Drawing, through a CAD
program or through some other acceptable means. |
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For vessel's with overhang; add in the aft
overhang volume as well as the longitudinal (from
Station 5) and vertical centers (from Baseline) of
buoyancy for this volume. 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 volume that is displaced aft of the rudder post, which may
be substantial. |
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The following water plane dimensional input data are required
on Sheet 3:
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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. |
|
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. |
|
Outputs:
| The
automatic output generated are: from Sheet 2 -displaced
volume (V), displacement (W), longitudinal center of
buoyancy (LCB), vertical center of buoyancy (VCB), from Sheet
3 - waterplane area (AWP), longitudinal center of floatation
(LCF), longitudinal moment of inertia about the LCF (ILCF),
transverse moment of inertia (IT), and from Sheet 1 - 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):
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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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