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Designing a stanchion/stopper for sea-fastening of deck cargo

Introduction Stanchions – a familiar term for mariners and ship designers. What are Stanchions? A stanchion is generally a vertical pipe or beam which is used to support some structural item or provide support rails on the deck. In ships, the most common type of...

Hydrogen as an alternative fuel for ships to reduce emissions

,This article first appeared in the Feb 2019 edition of Marine Engineers Review. It is being reproduced with minor edits here for the readers of TheNavalArch's blog. Introduction The world is on facing a grave environmental challenge with an increase in carbon...

Global wave statistical analysis and its use in deepwater operations

Why do we need wave analysis? For the design of offshore operations such as installation and transport of offshore structures, as well as lifecycle design of floating and fixed structures, knowledge of extreme waves as well as the probability of different sea-states...

Designing bolts for a joint connection

Introduction   Bolts are very commonly used fastening items and used in a variety of configurations. In this article, we will explore in-depth the design of a bolt used in connecting two members at a joint (bolted joint). We'll see what properties of the bolt are...

The why and how of designing a lifting beam

Lifting beams are universally applied gear used widely in various types of lifting operations, onshore and offshore. In this article, we will explore the design of a basic lifting beam and see what design checks are needed to establish the suitability of the beam for...

Draft Surveys: Methodology, Calculations, and common errors

Introduction   Marine transport is the backbone of the global trade and reasonably can be considered to be the artery of the global manufacturing supply chain, as more than four fifths of the world merchandise trade by volume is carried by sea. Undoubtfully, the...

Designing a clip/dog plate for seafastening

Introduction In an earlier article, we saw how to design stoppers for seafastening. Stoppers are items that are used to contain the translation movements (longitudinal and transverse directions) of a cargo on the deck/hold of a vessel. That brings us to the question –...

The Bulbous Bow – types, characteristics, and effects

This is Part 2 of the two-part series on Bulbous Bows. For Part 1, click here  By Tamal Mukherjee,    *This article originally appeared in May 2019 edition of Marine Engineers Review (India), the Journal of Institute of Marine Engineers India. It is being...

Using Class Rules to assess the Longitudinal Strength requirement of Barges

Introduction The longitudinal strength of a vessel is integral to its evaluation for a given purpose. To get an introduction to the topic, please refer to our other article https://thenavalarch.com/longitudinal-strength-ships-introduction/ In this article, we’ll see...

The four important factors for a ship’s windage area calculations

Introduction The windage area of a vessel or offshore structure is the area that is exposed directly to the wind. As is obvious, this is the area of all items above the waterline. This will include Part of the hull/offshore structure above the waterline...


Excellent and Reliable

Costas Carabelas

Dear TheNavalArch,

CCTO is an almost 40 years Naval Architects company operating in the world wide Shipping industry as technical consultants with a significant variety of projects in our portfolio.

Six years ago we ascertain existence of your first products and we immediately decided to make use of them. The experience gained over the years is,

  • The software  you are developing are of an extended application  in our activities and every day questions we have to deal with. Let’s call this as ”LARGE SCALE “ application products”.
  • The Rules & Theory your products are based on are most reliable and of vast acceptance by the entities our projects are reviewed. Let’s call it as “RELIABLE & SAFE”.
  • The support we had from your side in each and every case we had a question was “EXCELLENT”.
  • Last but not least Your pricing policy is more than “FRIENDLY”

Please use our comments as an incentive for more products development in same spirit as above, assisting our activities.

Costas Carabelas
C.C.T.O. (Costas Carabelas Technical Office), Greece

Fine job..

robert p bob hill president 88029

You do a fine job of explaining the methodology and inputs to your spreadsheets which allows our people to make effective use of them immediately. We will certainly continue in the future, to purchase your products

Robert P. Hill, President
Ocean Tug and Barge

Time savers…

Jim A m

Just a note on the TheNavalArch’s programs, I have several and find them very well done, especially helpful is the very detailed analysis presented with each program (and the very reasonable price). The programs are real time savers and pay for themselves after a single use. The detailed outputs are well organized and ready to be included directly into engineering reports as is, with no modifications or editing required. I also find the articles on various topics sent out from time to time to be very informative and useful also. 

James Andel
P.E., Civil Engineer

Practical, straightforward…

Theo Haak TheNavalArch

I have been using the TheNavalArch’s spreadsheets already for many years in the maritime salvage industry with great pleasure.

They are practical, straight forward, understandable, written in a plain language and in line with the actual regulations of classification bodies.

Theo Haak, Owner
Haak Consultancy Salvage

Professional work…

tony laubreaux

Just wanted to thank you for your assistance with the two technical analyses we conducted recently.

I was pleased with the work provided, which was very professional. In addition, your response to enquiries and requests for further analyses was always prompt, which was very much appreciated.

I look forward to working with you in the future.

Tony Laubreaux
Laubreaux Marine SARL

Better than the software I am used to…

jose zorrilla

Your spreadsheet is great, even better that the software I am used to.

I am using it in order to design fenders for a new Harbour in Montevideo.

Jose Zorrilla
Civil Engineer,ACI,NACE

Great to have a double check…

Kris Decke

So far I have downloaded Lug and Cargo forces spreadsheets and use them daily and find them very useful.

I get similar results with my own spreadsheets so it’s great to have a double check as its very easy to make a mistake in a spread sheet

Kris Decke, Design Engineer

Reliable engineering apps…

IMG 20181026 WA0020

TheNavalArch’s products have been handy for us in getting reliable Engineering Calculations for critical Marine Operations like Mooring, Loadout and Towing which we carry out on a regular basis.

The Technical Support is prompt and helpful in clarifying doubts and queries. Technical Consultancy provided for Critical Loadout operations involving Ballasting and Stability Calculations have helped us deliver our projects timely.

Capt Kulwant Singh, Managing Director
EkOne Safety and Marine Management Pte Ltd, Singapore

Helpful in operations…

Thank you for the outstanding help we received during our project.

Your products have also been helpful to us in our operations.

Highnet Marine Technology(HMT, Korea)

Useful for quick checks

Bil Stewart TheNavalArch

I am generally pleased with each of the calculators.  I primarily use them for quick checks on intermediate stages of generally more complicated calculations

Bil Stewart, Founder & CEO
Stewart Technology Associates

Reliable engineering calculations


Over the years working as a Naval Architect I have reached out to TheNavalArch on many occasions on various projects for reliable engineering calculations.  TheNavalArch calculators are very reasonable priced and do a great job of explaining the inputs and methodology used.  As most companies and engineers have their own database of calculators, I have relied on the TheNavalArch for both new design of calculations as well as QA of existing engineering calculations.  The technical support from TheNavalArch is very prompt and helpful with any technical issues that have occurred.  The calculators are certainly a time saver with the peace of mind of correct outputs.  Keep up the good work and will continue to look to TheNavalArch in the future as a supportive resource to my engineering designs and projects.

Sean Cole, Naval Architect
Marine Services International Ltd

Well done and easy to use


I have and will continue to use your articles as I teach my younger designer crew.  My main work deals with some commercial vessels and yachts up to around 40m.  In addition I have a nice collection of your software that I have found to be well done and easy to use.  Keep up the good work.

Stephen Seaton
Seattle Boat Designer

Hi There!

Welcome To


We endeavor to become the richest hub for quality online resources for the Marine and Oil & Gas industries. We currently house an array of marine calculators which are handy and easy to use in design and operations. You may also wish to checkout our technical Articles which are in-depth and written by some recognized industry experts. Do try our 'Engineering On-demand (EOD)' service which helps you get the best engineering analyses and design done by our panel of experts: quality work - on time, on demand.

We're based out of Singapore, and on the constant lookout for collaborators who are willing to share knowledge and content with the industry. To share your ideas and feedback, feel free to write to us.