Marine Articles


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Stay updated on the latest blog posts from DMS.  Everything from videos to technical articles, the latest software, and so much more.

Hydrodynamics and Hull Design

Linking Hull Shape to Powering   Ship science links the heritage of maritime design, and the potential of modern scientific knowledge.  A refined hull shape epitomizes that link between tradition and science.  A modern naval architect carefully designs the hull shape based on previous examples and the science of hydrodynamics.  This article glimpses into the […]

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Video: Selecting the Right Hullform

Monohull, catamaran, trimaran . . . so many choices. Which hullform to pick? Can we draw upon any science to guide our choices, or we beg Lady Luck to guide us? This article provides a rational and design map for selecting hullforms applicable to any type of mission. This organized approach allows us to see past the limitations of historic examples and consider new alternatives.

Posted in 0100 Hull Structure, 0800 Integration / Engineering, 0810 Production Engineering, 8200 Fluids, 8210 Fluid Dynamics, 8250 Hydrostatics | Tagged , , , , , , , , , , , , , , , | Leave a comment

How Many Tons in a Pound?

How man tons in a pound? When ships weigh thousands of tons, you really need to know which type of ton. So take five minutes and get clarity on the esoteric measurements of ship design.

Posted in 0800 Integration / Engineering, 0810 Production Engineering, 0830 Design Support, 0840 Quality Assurance, 8900 Drafting | Tagged , , , , , , , , , , , , , , , , | Leave a comment

Six Tip to Improve Your FEA

An experienced engineer doesn’t have some magic button to deliver great FEA. Masters of FEA trade-craft hoard many little tricks and nuggets of wisdom to deliver better FEA. These tricks yield better ways to detect human errors and ensure model reliability. Or methods to deliver faster results. Today we share six nuggets of wisdom for better FEA.

Posted in 8100 Structural, 8190 Special Methods, 8191 FEA / Numerical Methods | Tagged , , , , , , , , , , , , , , , , , , , , , | Leave a comment

Splitting Waves and Hairs: Comparing X-Bow, Axe Bow, and More

Axe bow, X-bow; slim size, thin size.  We currently enjoy an explosion of variety in bow shapes, each suited to a different task.  These may all look the same with a cursory glance, but don’t get fooled.  Nearly the same bow shape, used on a different vessel may work for entirely different reasons.  This time […]

Posted in 8200 Fluids, 8210 Fluid Dynamics, 8220 Resistance, 8450 Fluid Loads, 8600 Arrangements | Tagged , , , , , , , , , , , , , , , , , , , , , , , , , | Leave a comment

How do I Select the Right Hull?

Monohull, catamaran, trimaran . . . so many choices.  Which hullform to pick?  Can we draw upon any science to guide our choices, or shall we beg Lady Luck to guide us?  Although hullform selection does involve some experience and artistic preference, naval architects definitely utilize a scientific framework when selecting hullforms.  This achieves the […]

Posted in 8200 Fluids, 8210 Fluid Dynamics, 8220 Resistance, 8400 Seakeeping / Fluid Structure Interaction, 8600 Arrangements | Tagged , , , , , , , , , , , , , , , , | 1 Comment

Go FAST Boat: Pros and Cons of a Planing Hull

ZOOM!!!  No better way to describe planing boats.  They pack very fast speeds into a very small package.  Many planing boats achieve speeds well beyond the limits of larger craft.  How do they do it?  And what are the penalties for this extreme speed?  Discover if a planing hull fits your next design.   1.0 […]

Posted in 8200 Fluids, 8210 Fluid Dynamics, 8220 Resistance, 8600 Arrangements | Tagged , , , , , , , , , , , , | Leave a comment

Smooth Sailing: Pros and Cons of a SWATH Vessel

Welcome to luxury cruising.  Glide above the waves without any jerky motions.  Walk about your accommodation deck, unhampered by nasty rolling motions.  If this temps you, come realize the dream of the SWATH vessel.  But it comes at a price.  Discover if this unique vessel is right for you.     1.0 What is a […]

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Why You Want a Trimaran: Pros and Cons of a Trimaran

Three hulls are better than one!  That would be the adage of the trimaran.  It consists of one central hull with two smaller side hulls, called amas.  The average person conceives of the trimaran as something even more extreme than catamarans.  Lighter weight, higher speed, more specialized.  The opposite is actually true; trimarans fill an […]

Posted in 8200 Fluids, 8450 Fluid Loads, 8600 Arrangements | Tagged , , , , , , , , , , , , , , | Leave a comment

Me and My Six Imaginary Friends: The Practicalities of Yacht Layouts

What distinguishes a yacht designer from a ship designer like myself?  Practicality.  Commercial ships only consider practicality; aesthetics never gets considered.  Personally, I pine to see a little more beauty in commercial vessels.  But this ruthless discipline of practicality provides unique insight into yacht design.  Many yacht designers are equally qualified and use the same […]

Posted in 8600 Arrangements, 8640 Human Ergonomics, 8643 Recreation | Tagged , , , , , , , , , , , , , , | Leave a comment

The TRUTH of Hull Speed: How to Break the Sailing Speed Limit

Hull speed is bogus, but not because the math is wrong.  This formula supposedly predicts the maximum speed of a yacht based solely on length.  It gets discussed frequently in sailing yacht communities.  Surprisingly, hull speed is partially correct, with a very simple and strong theoretical basis.  But don’t sell yourself short; there are ways […]

Posted in 8000 Engineering Business, 8200 Fluids, 8210 Fluid Dynamics, 8220 Resistance, 8230 Propulsion | Tagged , , , , , , , , , , , , , , | 1 Comment

Six Keys to Better Marine FEA

Tips to Improve Your FEA Model No matter how much work you do in finite element analysis (FEA), there is always room for improvement.  Masters of FEA trade-craft hoard many little tricks and nuggets of wisdom to deliver better FEA.  These tricks yield better ways to detect human errors and ensure model reliability. Or methods […]

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Trust Your Singularity

Why FEA Singularities Are Acceptable 1.0 Introduction You stare in dread at the FEA results, which show unbelievable stresses in small spots at the corners.  Don’t panic; they are only stress singularities.  Small regions where the FEA predictions are completely wrong and the math failed.  What reason is there for concern? Stress singularities are very […]

Posted in 8100 Structural, 8120 Elastic Static Loading, 8191 FEA / Numerical Methods | Tagged , , , , , , , , , , | Comments Off on Trust Your Singularity

Mesh Size Does Matter

FEA Errors from Mesh Size   1.0 Introduction When was the last time you actually tested your finite element analysis (FEA) results?  Are you sure that every FEA analysis ever ordered is accurate?  Will you trust your life to it?  In truth, FEA results can be wrong.  In most cases, the error originates with the […]

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Reviewing FEA Analysis

Get The Most From Your FEA Report 1.0 Introduction The engineer delivered a shiny new FEA report, but what does it mean to you?  What details to look for?  Are the results good or bad?  An FEA report contains much more value when all those colorful graphs reveal their meaning.  Today we unveil the secrets […]

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