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Powering the maritime industry with Hydrogen – Part 2

Powering the shipping industry with hydrogen - Part 2: Hydrogen propulsion on a ship - opportunities and challenges   Introduction In the Part 1 of this article, we explored the basic properties of Hydrogen as a fuel, and also the opportunities and challenges...

A simplified method of performing fatigue analysis of offshore structures

A simplified method of performing fatigue analysis of offshore structures   Introduction An offshore structure is subject to environmental loads of waves, wind and current. By their nature, the resulting wave loads on the structure are cyclical. These cyclical...

Powering the shipping industry with hydrogen: opportunities and challenges (Part 1)

Part 1: About Hydrogen – Basics, Opportunities, and Challenges Of late, hydrogen has been generating quite a buzz in the energy sector with its possibility as a clean source of energy. The shipping sector is not untouched, and this article explores the possibilities...

How to use a ship’s hydrostatics to calculate its draft and trim

Introduction A ship’s hydrostatics, or hydrostats, is an oft used term in maritime parlance, and it refers to the characteristics when it is floating. What characteristics are these? How are these determined, and how can we read and understand them? Understanding...

Numerical integration methods for hull volume estimation

Introduction The hull of a ship is a complex 3D geometry, and finding out its simple properties like volume, centroid, etc. is not possible through simple formulae unlike standard shapes like cuboid or a cylinder.   How do we find a property, say the volume of a...

Selecting the right Capstan for berthing a vessel

Introduction Capstans are frequently deployed mooring equipment used on all types of vessels. Capstans are berthing/mooring equipment used to multiply the pulling force on mooring ropes. Traditionally, Capstans were operated manually but in modern ships, they are...

How to do rule-based fitting calculations of a keyless propeller

Introduction A keyless propeller, as the name implies, requires no key for fastening the propeller on the cone of the propeller shaft. How is the torque then transferred to the propeller? The torque is transferred by the friction between the propeller and the...

Designing Fillet Welds for Symmetrical Joint Sections

Introduction Fillet welds are the most commonly used weld types in marine structures. A fillet weld is used when there are two pieces of metal that are joined perpendicular to each other or at an angle. In this article, we will explore how to select the right size...

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...


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… Read more “Excellent and Reliable”

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… Read more “Time savers…”

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… Read more “Professional work…”

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… Read more “Reliable engineering apps…”

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… Read more “Reliable engineering calculations”

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… Read more “Well done and easy to use”

Stephen Seaton
Seattle Boat Designer

Like having another person in the team

“Your software is great , support is first class. It is like having another person in the team” Managing Director, Iain Macleod & Associates Ltd

Iain K Macleod
I K Macleod & Associates Ltd

Indispensable tool


Review of ‘Planing Vessel Resistance Calculator” “Indispensable tool if you want to calculate the resitance of plannig boats when you do not have the numbers from the yard. During the development of the Hyrdoimpulse (Hydro Impulse Systems) I have calculated many propulsion use cases for several planning boats. This tool gave me an estimation about… Read more “Indispensable tool”

Gernot Neuböck

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.