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| GHS
is the most comprehensive (in absolute) and powerful (in the microcomputer
world) stability calculator. GHS does not stop at calculating static
stability parameters, but checks for positive stability in every
condition and configuration. GHS supports variable density cargo, staggered heel/flotation plane conditions (hopper dredges, barges, etc.) as well as any compartment damage combination. Longitudinal strength, floodable lengths, probabilistic damage, automatic class criteria checking, fully customizable output formatting (any language), etc., are only a few of the features found in GHS. |
In
addition, GHS offers a full depth programming language for the writing
of macro routines, and linking to user-developed programs, thereby
fully automating work to unrivaled heights. GHS includes several
industry standard interfaces, and supports a large number of printers
for the outputting of graphs and tables. |
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| GHS
is an extraordinary computer software system which causes ordinary
PCs to become powerful hydrostatics/ stability computing machines. Developed by Creative Systems specifically for the PC and refined over a period of several years, GHS has become widely recognized as the most productive tool of its kind. It surpasses traditional mainframe-based systems such as SHCP both in capability and efficiency. In constant use by major design firms and shipyards, GHS is well proven, reliable, and well accepted by regulatory agencies. GHS is truly general-purpose. Not only does it handle ship hulls, but also anything that floats or contains liquid - or both. It has been used to analyze and/or design submarines, SWATHs, dry docks, drilling platforms, 10-foot sailboats, 300-meter freighters, floating bridges, and even a floating golf course. When the going gets tough, GHS keeps going: churning out intermediate stages of flooding, simulating the spilling of cargo, and optimizing against complex stability criteria - automatically. Since marine technology is not static, neither is GHS. In response to feedback from users and the increasing sophistication of stability standards, we're constantly extending and improving GHS to ensure its continued leadership and excellence. GHS is simply the most efficient way to do common stability jobs, and the only way to do the hard ones. GHS is General HydroStatics. |
Here is the fleet of software modules which compose the GHS system:
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| What
Makes GHS Special? There are a number of PC-based stability programs from which to choose. They all claim to do most of the same calculations GHS does; some cost more and a few cost a lot less. So what makes GHS so special - and more than worth its price? Part of the answer lies in the special features. Automatic handling of the IMO "Severe Wind and Rolling" and "Probabilistic Damage" criteria, for example - a tremendous time saver. True CG shifts of tank contents both transversely and longitudinally for better realism and accuracy. Heeling about any axis (essential for some shapes - drilling units for example - and where longitudinal stability is a problem). And the unsurpassed ease of modeling complex structures and detailed interiors saves more man hours on a regular basis than perhaps anything else. Part of the answer is certainly about efficiency - especially on the big jobs. Efficiency means doing a job accurately, correctly and on schedule. Computers naturally do things accurately, but whether a job is done correctly still depends on the person who prepares the inputs for the computer - and people are by nature prone to making mistakes. When mistakes have to be corrected, the schedule (and the profits) sometimes go out the window. But GHS helps a lot. First, with its macro commands it reduces the chances of human error by reducing input repetition. And secondly, when things have to be redone you can make a correction and rerun a complex report with very little extra effort. |
A large part of why GHS is special has to do with its basic approach to the stability problem. Most programs follow a more-or-less traditional approach based on techniques developed before computers existed. But GHS is a wind from a new quarter. You won't notice the difference in a list of features - and you can even use it without noticing the difference (if you are thinking in the traditional way). But once you discover the direct, simulation-oriented approach which GHS encourages, you will never want to see another cross curve. (Of course, if someone insists on cross curves, you can get them from GHS.) But there is something else in the "specialness" of GHS which we have trouble describing. Perhaps it's something intangible. People either grow fond of a computer program or grow to hate it. One shipyard architect said, "GHS is my right hand". An executive in a prominent design firm told us, "GHS is our life's blood". A man who helped design the original SHCP is reported to have said, "I can't face SHCP anymore - I've got to get GHS". After using GHS for about three years, a well known naval architect wrote, "GHS is absolutely stupendous in its completeness, versatility, and its accuracy". After using GHS in a research project, the project director wrote us a note saying, "I figure GHS saved us about two years of work". That's what makes GHS special. |
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| GHS
(The Main Program) You can do the ordinary things so easily with GHS that first-time users believe it's a simple program. But when they're still discovering features after a year or longer, they tend to have a different opinion. Hydrostatics can be easy, but it can become involved and complex at times. GHS does not ignore the complexities of reality. It helps you think them through and solve the problems while recognizing the subtleties. When you approach a hydrostatics analysis you have to make some decisions about how much detail there should be. You build a geometrical model of the vessel with the appropriate degree of detail. Then you run GHS with the model to simulate the vessel's resistance to heeling moments in various conditions - to an appropriate degree of detail. Preliminary designs can be modeled with less detail so that they can be quickly cycled through modification phases. Final designs will have more detail. The amount of detail which GHS handles is large, but not unlimited. With reasonable point densities, a hull including a dozen or so appendages, twohundred tanks and compartments, plus up to two hundred distinct non-liquid weight items is the limit. How fast is GHS? It depends on how detailed your model is and what you want it to do. If you build a fancy model with a couple of hundred tanks and set it up to find maximum VCG in a dozen loading conditions, each multiplied by a number of damage scenarios with intermediate stages of flooding, you will need to be prepared to do something else while GHS is crunching numbers. |
But if you just want a righting arm curve from an average model, it will take less than a minute (much less on a fast computer). Damage stability is straightforward with GHS; and what happens with loaded or empty tanks with and without damage is all taken care of automatically. True CG shifts in tanks are the norm (the traditional but less-accurate free surface "correction" is optional). Heeling moments from the wind plane and other sources are available, as are several kinds of waves. GHS does almost everything with few restrictions - heel and trim are unlimited, for example (great for salvage work). You can even change the heeling axis - heel on a diagonal or even do a fore-and-aft righting arm curve. Stability criteria are built in but not cast in concrete. You can choose your own limits and roll your own combinations. Tell GHS your criteria and it will find the maximum VCG - even with damage, wind or wave, or all three together. No description of this program would be complete without a mention of the macro facility. Being command-oriented (vs. menu-oriented, although menus can be used), GHS is actually a language in which you express the design of the report you want to create - using the terms of your own building blocks, which are called "macro commands". It's the lever with which you can easily move a mountain of data. |
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| GHS
Plots Pictures in a printed report are helpful. The GHS report generator takes the entire output stream, inserts the graphics, and puts the entire report out on the printer - all automatically. This operation is almost invisible because the program makes all of its decisions automatically. The only decision you have to make is whether you want graphs in your report. If you do, then the report generator does the job with no questions asked. The report generating facility in GHS is actually a complex piece of software, in spite of its apparent simplicity; and a close examination of the output it produces proves the point. GHS produces all of its output by means of ordinary pin, inkjet, and laser printers on standard 8.5" wide paper. We have made no attempt to support pen plotters because doing so seems to be contrary to some of the philosophy behind GHS. This may take a bit of explanation: We believe that the proper goal in designing software is to direct the resources of the computer toward accomplishing the whole task, not just to mechanize a step in the process. In the case at hand, we looked at the traditional production and use of plotted hydrostatic data and decided not to support the production of large-format plots. |
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| GHS
Extensibility By extensible we mean that GHS provides facilities for its own extension and expansion. It gives you the ability to create new features and procedures. This extensibility is of four major kinds: 1) Macro Commands. A macro command is a new command which you design yourself. The concept is that you can encapsulate your own procedures so that they become part of your "customized GHS". This is an extremely powerful and easily-used feature. 2) Menu Systems. You can design and create various menu-driven "applications" within GHS. A MENU command is provided which, together with macro commands, allows you to create programs for specific applications which can then be used by someone with little or no knowledge of GHS. |
3) Programming Interface. Virtually any conceivable feature or calculation can be added to GHS with this facility. It allows you to integrate your own programs into the GHS environment while giving you access to the underlying data and "hydrostatics engine". 4) File Interfaces. Several kinds of "industry-standard" data files are recognized by GHS. This facilitates communication between GHS and other programs so that you can assemble a system of software extending into areas not covered by GHS. Extensibility means that you are not locked into one way of doing things. It also increases your options for enhancing and developing GHS to meet specific requirements. |
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Maker In order to understand Part Maker, you need to understand that in GHS we literally build a model of the vessel, and base all calculations on the model - not on intermediate abstractions such as Bonjean Curves. This is true not just of the hull(s) but also of the tanks, compartments, appendages - everything which contributes to the buoyancy or windage. Of course, we are speaking of a mathematical model comprised of numbers; but the effect is very much like that of a physical model. You can view the model from various angles and manipulate its individual Parts. What is a Part? Just those things which you want to handle when doing stability work. Each tank, for example, would be a Part; and obviously the hull would be a Part. Normally, the hulls of a multi-hull vessel would all be put into one Part, since there is usually no need to see their separate hydrostatic properties. But a ship in a dry dock would typically be a separate Part from the dry dock hull. Still, Parts can be quite complex - such as a hull with several appendages. So GHS allows you to build your Parts from pieces called Components. Take the case of a thruster tunnel. It not only modifies the hull, being a "negative appendage", but it probably modifies one or more tanks also. If you have ever manually constructed stations in the way of a thruster tunnel because the tunnel indentation had to be integral with the hull shape, you will love Part Maker. |
It not only constructs the cylindrical tunnel with one simple command but it fits the tunnel to the hull and will even fit tanks around the tunnel! In short, Components allow you to build complex Parts accurately and quickly without causing unnecessary detail to clutter the reports. Part Maker is a solid modeling tool designed specifically for hydrostatics models. It makes tanks, compartments, appendages, sponsons, camber, shell, insulation and fits them all together. It can scale, shift, stretch, combine, and display models. Part Maker essentially extends the GHS command language so that the construction of a model can be described. Just as important as the final model itself is your expression of how you build the model; and this you can preserve for future reference. We call it the Run File. If you want to change the model in any way, simply edit your Run File and run Part Maker again. Because it gives you so much power, we consider Part Maker to be an essential part of GHS. Rowing is fine if you have the time. But if you want to get there fast, you need a motor and you need Part Maker. |
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| GHSCOM
provides access to the GHS (General HydroStatics) main calculating
engine through Microsoft COM technologies. This allows GHS to be
tightly integrated into other programs. Any application written
in a language that supports the COM calling convention can link
to GHS through the GHSCOM module. Such languages are, • C/C++ • C# • Delphi • Java (COM Bridge) • Visual Basic • Visual Basic for Applications (VBA) • VB Script VBA is of particular interest since common application programs support VBA including Microsoft Office and AutoCAD. This means that a GHS user can write VBA functions in Excel, for example, and with very little effort have a spreadsheet with cells that call GHS functions. |
GHSCOM
is an optional module of GHS and cannot be used independently
of a GHS license.
The GHSCOM interface is simple. It provides for sending commands to GHS and for retrieving variable values. Standard GHS file output resulting from the execution of commands can also be produced. No screen window for input or output is provided since those functions are to be supplied in the user's host program. This precludes the use of Load Editor and any other GHS commands that require screen output or take keyboard input. Other commands not available through GHSCOM are those having to do with general file handling and execution control -- things that are easily done in the language of the host program. |
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Advanced
Features |
- Damage Stability |
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Graphic
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Floodable
Lengths |
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Hull
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Editor |
Longitudinal
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| Model
Converter MC converts geometry data to the GHS Geometry File format from various other formats and vice versa. Currently it does the following conversions: SHCP and HEC hull and tank definitions to GHS Geometry CAD drawings (DXF) to and from GHS Geometry Offset (OFE) files to and from GHS Geometry IMSA Data Files (IDF) to and from GHS Geometry PIAS (EAG) offsets to and from GHS Geometry SHCP Conversions Since there is a significant difference in the way in which SHCP and GHS interpret offsets, MC reads and processes the SHCP data in the same manner in which SHCP does. However, MC does a much more thorough job of checking the SHCP offsets for errors than SHCP does itself. Many of these errors, if undetected, can lead to serious errors in SHCP calculations. So we would say that even if you are using SHCP you need MC to check for errors! Compared to the SHCP method of representing hull geometry, GHS uses a simpler representation which is more reliable and more suitable for automatic computation. (SHCP bases its representation on the requirements of Simpson's first rule for area integration.) However, the GHS representation (based on the requirements of trapezoidal integration) requires roughly twice as many points and stations to achieve a comparable level of precision. MC adds these points and stations automatically. |
One interesting feature of the SHCP-to-GHS
conversion is that longitudinal and transverse aberrations (due
to incorrect station spacing in the SHCP model) become visible
after the conversion. Even when the SHCP model is considered "clean"
because no transverse "blips" are present, there may
be "longitudinal blips" which would appear in the area
curve only at certain waterplane orientations and would therefore
be difficult to detect. The GHS form of representation avoids
this problem, since all area curves are closely related to the
model as it appears by inspection. |
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| Multi-Body The Multi-body module allows General HydroStatics (GHS) and GHS LM (GHS Load Monitor) software to handle multiple floating bodies with points of contact between them. Ground contact can be included simultaneously. > Applications include: -onboard load monitor for tug-barge units; -detailed simulation of loading and unloading floating objects by partially submerging the carrier: - complex salvage procedure modeling; - ice breaker simulation; - dry docking; - articulated floating structures. Equilibrium of the entire multi-body system is found automatically and the forces at the points of contact are reported. |
This new capability is available
through an optional software module being called simply "Multi-Body"
or MB. It is tightly integrated with GHS so that the usual features
of the program can be used in conjunction with it. |
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Surface
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| Tank
Soundings Tank sounding tables are interesting because of the variety of formats and requirements which are encountered. Since some of those requirements are quite specific, we made a special module to handle them. GHS also produces tank sounding tables with a considerable amount of flexibility in the makeup of the table. While the tank tables from the GHS main program are intended primarily for design work, the TS module produces sounding tables for use in the field. TS offers five table formats: 1) Gallons vs. Sounding in inches, arranged in vertical columns; 2) Gallons vs. Sounding in feet and inches, arranged in a 12-column table; 3) Gallons, Cubic Feet, Center of Buoyancy, Moments of Inertia vs. Sounding in feet; 4) Same as 3 except a Trim Correction column replaces the Longitudinal Moment of Inertia; |
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Because it is fundamentally simulation-oriented, GHS is an excellent
tool for answering the "what if" questions involved in
salvage operations. And since it does not limit trim and heel angles,
you can simulate any orientation in which you might find a distressed
vessel - from upright to upside down to standing on end. Several other features are also of special interest to the salvage engineer: Quick model generation GHS provides a means of very rapidly constructing a hull model from a small amount of information. Even rough dimensions together with a general knowledge of the hull form are sufficient to produce a useful model. Weight estimates can then be obtained from the operating drafts. The ability to import hull models expressed in various data formats is also provided. Damage simulation Damage limited by compartmentalization and damage in the form of hull deformations are readily simulated. Both types of damage can be present together and both can be nonsymmetrical. three modes of tank damage are provided, including pressure balancing for accurate oil outfolw calculations. Partial flooding Since GHS computes the weights and centers of all contained fluids at any given vessel orientation, partially flooded spaces are accurately represented. Ground reaction calculation The locations and magnitudes of the forces exerted by the ground when a vessel is stranded is easily determined. GHS provides a very flexible and realistic ground reaction mechanism. |
Stability
and stress when damaged and grounded Damaged, flooded and groundedstability, and longitudinal strength calculations are easily and quickly obtained. Downflooding and spilling Downflooding points can be modeled and their heights above or below the water are readily obtained. Spilling of water on deck from a tank can also be calculated. Sealed and vented tanks Tanks may be pressure-balanced at the point of damage, with vented or sealed tops. This allows accurate calculations of cargo loss when damaged. Complex models Situations where a ship is combined with a dry dock or is being loaded onto a barge are easily modeled. Other complex structures such as floating drilling units and various pontoon structures are also readily handled. Menu systems In order to simplify the use of GHS in the field, menu systems can be built which directly address the various requirements of salvage work. A standard salvage-oriented menu system is provided. Extensibility Because GHS is general and extensible, other salvage-specific features can be added by building onto its basic facilities. The ability to make such additions is available to the user. |
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| BHS
is similar in many ways to GHS, being a derivative or "subset"
of the larger program. BHS includes hydrostatic properties, curves
of form, cross curves of stability, load condition status, heeling
and trimming moments, wind heeling derivation, righting arm curves
and areas (with constant trim or constant trim moment), tank characteristics
and soundings, damage stability, stability on waves, intermediate
stages of flooding, tank CG shifts, and much more. BHS produces
high-quality reports with graphs and has the same wide recognition
and acceptance as GHS. On the model-building side of the system,
BHS comes with Section Editor - the graphical hull modeling tool
- and a version of Part Maker which makes it easy to build all sorts
of tanks and compartments into the model. Most of the GHS optional
modules are also available with BHS. |
These
are Model Converter, Longitudinal Strength, Load Editor, Floodable
Lengths, Tank Soundings, Grain Shift, and Hull Maker. What BHS lacks
relative to GHS are, most noticeably, some of the features from
Part Maker which help with the creation of appendages (but appendages
can also be created using Section Editor); it also omits the automatic
stability criterion evaluation facilities of GHS; the maximum-VCG
solving; BHS cannot change the axis of heel; it lacks the tonnage
calculation; and it does not have access to the Advanced Features
or the Programming Interface modules. Since BHS includes most of
the features of GHS, its price makes it a great value. It also retains
its value because it can be traded in with credit for its full purchase
price for an upgrade to GHS. |
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"GHS"
has been the personal computer stability standard since its introduction
about 25 years ago, by virtue of its rich feature set and unrivalled
power. Although most GHS components are in fact 32 bit native Windows®
programs, the user interface does not include a pull-down menu.
WMG4 adds Windows standard features to some of GHS modules (pull-down
menus, etc.), and completely replaces others with user-friendly
Windows® programs. |
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Beginning with the 32 bit version of GHS v7.50, Creative Systems added a rudimentary set of native menus. On versions before 7.50, GHS Enhancer adds a standard menu bar to the window. After version 7.50, GHS Enhancer augments the existing menu bar with additional menus. GHS Enhancer v4.0.08 or later is required for use with 32 bit GHS v7.50 or later. |
GHS Enhancer also solves a long-standing problem with running GHS in Windows - setting the current directory. When launching GHS Enhancer, you will first be prompted to select the working folder, which defaults to the last folder accessed by any of the WMG components. The current folder name is then inserted into the new window's title bar, so you always know where you areey assignments
and macro names are placed in customizable menus. GHS Enhancer remains at version 4.0 (no version 5.0 is available). This program will be gradually phased out as Creative Systems (the developers of GHS/BHS/BHSY) completes its conversion to a full 32 bit Windows program with useful menus. Existing users of version 4.0 do not need to purchase upgrades. |
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The Part Maker program lacks the menu driven
interface which makes using Windows programs so much easier. PartMaker Enhancer extends Part Maker with the addition of menus and other dialogs, which makes it much easier to use. |
In addition to PartMaker Enhancer's other features, it also provides direct access to Part Maker's on line help library, and includes searching features not available anywhere else.
PartMaker Enhancer remains at version 4.0 (no version 5.0 is available). This program will be gradually phased out as Creative Systems (the developers of PartMaker) completes its conversion to a full 32 bit Windows program with useful menus. Existing users of version 4.0 do not need to purchase upgrades. |
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One of the great benefits afforded by Chart Virtuoso is the ability to generate reports completely within your computer with its export features. In combination with word processing or page layout programs, an entire report can be assembled in a single computer file. Contrast that with the typical piles of printouts!
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A typical display is shown below, showing the standard three views (profile, plan & axonometric) in resizable panes. Each view pane may be zoomed independently. A drop list of model parts is presented in the upper left corner. Next to that is the components drop list, which contains the components of the currently displayed part. The Render menu allows visualization of 3-dimensional part surfaces, as shown in the example below. Other buttons control part, component, and shape editors, part & component selection, rotation (360 degrees both horizontally and vertically), section selection, and point selection.
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Main features include:
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In addition to the standard editing features, EditX allows you to turn off or on word wrapping, and allows you to specify which file extensions your want to associate with EditX. For example, you could associate the ".run" file extension with EditX, so that your can open all ".run" files with EditX from Windows Explorer. New in version 5.0 is a button bar of open documents, and optional printing of page headers showing the file name and page numbers. And the best part... Its free with the purchase of any other WMG module! |
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Although primarily intended as a tool for calculating properties of large composite sections, MSC can also be used to calculate simple beam & plate combinations. With the capability to rotate sections, unusual beam combinations can also be evaluated. |
Features of Midship Section Calculator include:
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Some Spreadsheet type programs can read text files, and even organize the data into cells. In many cases this is much more than you want. With Extractor, you specify which specific data you want, and ignore the rest. For example, consider the following text output from a vessel stability program:
Using Extractor, you could easily extract a spreadsheet table such as this:
Extractor's key features include:
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You define what data you want extracted by specifying key words to look for (such as "Total Weight"), the row and column offset from the key word to the extraction text, and the number of characters to extract. You may also have Extractor search for the start of the nearest word to the extraction position, for the case when the column offset is not constant. To extract entire tables, the Row Count may be set greater than 1. The Configuration Wizard allows you to preview the file you will be extracting from, and simply select a sample Search Text and sample Extraction Text.
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To start the process, you should have a hull defined in Creative Systems's geometry file format, or in Multisurf's OFE or OF4 formats. A companion program to PWE called Geometry File Modeler may also be used for this purpose. This is then imported into PWE, which converts the sectional data into triangular surface panels. You then organize the imported panels into groups, and assign panel weights. Any standard units of measure may be used, both English and Metric. Additional panels can then be added, fitted to existing panels. Once you have created your model, you can:
PWE version 5.0 has been updated with the following improvements:
A typical display is shown below, showing a rendered sample weight model. The shell panel groups have been turned off to allow viewing of the inside of the model. |
In order to quickly assign panel unit weights, PWE includes a Unit Weight Estimator as shown below:
How accurate is Panel Weight Estimator is a frequent question. The answer rests with you, as the model builder. The more accurate you are with panel unit weight assignments, the better your results will be. The technique used by PWE was used to calculate the steel weight of a passenger ferry, and the results were practically identical to the shipyard's full steel weight takeoff. If you want a very good steel weight estimate in a relatively little amount of time, PWE is the program you need. |
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Where GHS & PartMaker version numbers are noted above, Creative Systems has upgraded their programs to allow interfacing with WMG, or WMG was modified to reflect revised command syntax. Later versions are also supported. We no longer claim support the Windows 95 operating system. If you have Windows 95 and are interested in purchasing WMG, we recommend that you
download (6462 ko) the demonstration version first, and test it out on your system. International Settings : |
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