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Free Calculators


Longitudinal Strength of Ships – an Introduction

LONGITUDINAL STRENGTH OF SHIPS – A GUIDE Source: Talking about strength of a ship, the picture that comes to mind is that of a ship being subject to rough weather of the sea, and trying her best not to crack or capsize. A ship with sufficient...

Mooring System Design and Analysis

Mooring System Design and Analysis by Rahul Kanotra, Consultant Naval Architect As the offshore industry moves towards greater technological advancements, one thing that has plagued the engineers is the “plug and play” computer programs or software. I am...


STEEL  COILS LOADING –  ITS CHALLENGES AND WAYS TO OVERCOME by Mr. Spiros Malliaroudakis (Founder & Managing Director, S.A. Malliaroudakis Maritime (UK) Ltd) The loads derived from steel coils loading are very concentrated, leading to higher stresses...

Bollard Pull Calculations – an Introduction (Part I)

Bollard Pull calculation is one of the most frequent calculations performed in marine towing operations. Towing operations involve the pulling of a vessel (it can be a barge, ship or an offshore structure) using another vessel (usually a tug).

Cargo Stoppers – why they are critical and how to design them

Stoppers and their critical role in seafastening of cargo Introduction A cargo transported on the deck of a ship is subject to many forces. These forces comprise of the inertial forces due to the ship motions – the three translations and three rotations – and the...

Introduction to Pipe Transportation – Part 3 (Engineering)

Introduction to Pipe Transportation - EngineeringIn Part 1 we learnt about pipes, while in Part 2 we learnt about Planning and Scheduling of pipe transport operations. In this part, we will learn about Engineering.Phase 3 – Engineering.Engineering for pipe...

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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.

Congratulations & Regards

Costas Carabelas

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

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


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

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. M.S.Kulwant Singh

EkOne Safety and Marine Management Pte Ltd, Singapore

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

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

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 Co.,Ltd. (HMT Korea)

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