Ship Stability for Masters and Mates

7th Edition

Authors: Bryan Barrass Capt D R Derrett
Paperback ISBN: 9780080970936
eBook ISBN: 9780080970943
Imprint: Butterworth-Heinemann
Published Date: 5th September 2012
Page Count: 584
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Ship Stability for Masters and Mates explores all aspects of ship stability and ship strength, squat, and interaction and trim, as well as materials stresses and forces. Organized into 56 chapters, the book looks at the relationship between ship stability and ship motion, with emphasis on group weights in a ship. It also explains how TPCs are calculated for a range of drafts extending beyond the light and loaded drafts, along with form coefficients, including the coefficient of fineness of the waterplane area. The book explains how to perform KB, BM, and KM calculations and make graphics on metacentric diagrams. It considers large-angle stability, the effect of beam and freeboard on stability, and hydrostatic curves and values for vessels that are initially on even keel. The reader is also introduced to free-surface effects of slack tanks with divisional bulkheads, how side winds affect ship stability, and the correlation between freeboard and stability curves. Other chapters focus on timber ship freeboard marks, procedures and calculations for drydocking and stability, and ship squat in open water and in confined channels. The book also includes extracts from the 1998 Merchant Shipping (Load Line) Regulations Number MSN 1752(M). This book is intended for students seeking to obtain Transport Certificates of Competency for Deck Officers and Engineering Officers and STCW equivalent International qualifications, as well as Chief Mates and Officers on Watch (Officers in Charge) on board merchant ships and other maritime personnel, port authorities, marine consultants, nautical study lecturers, and marine superintendents.

Key Features

  • Updated throughout to include new shipping industry developments and regulations, with 9 new chapters, the latest ship stability datasheets, and sample exam questions
  • Provides a comprehensive introduction to all aspects of ship stability and ship strength, squat, interaction and trim, materials stresses and forces
  • Concepts are supported with numerous worked examples, clear diagrams, graphs and equations to assist with understanding and application of this critical subject


Practising marine engineers, naval architects and ship operations personnel; Consulting marine engineers; Marine engineering students on courses in ship stability and related areas; Students on professional certification / vocational courses covering the above.

Table of Contents






PART I: Linking Ship Stability and Ship Motions

Chapter 1. Group Weights, Water Draft, Air Draft, and Density

Group Weights in a Ship

Effect of Change of Density when the Displacement is Constant

Effect of Density on Displacement when the Draft is Constant

Chapter 2. Transverse Statical Stability



The Metacenter


Correcting Unstable and Neutral Equilibrium

Stiff and Tender Ships

Negative GM and Angle of Loll

The GM Value

Chapter 3. Effect of Decreasing Free Surface on Stability

Correcting an Angle of Loll

Chapter 4. TPC and Displacement Curves


TPC Curves

Displacement Curves

Chapter 5. Form Coefficients

The Coefficient of Fineness of the Waterplane Area (Cw)

The Block Coefficient of Fineness of Displacement (Cb)

The Midships Coefficient (Cm)

The Prismatic Coefficient (Cp)

Chapter 6. Discussion on LCB Position Relative to Amidships

Observations Regarding Figure 6.1

Formulae Used for Figure 6.1

Observations and Formulae Regarding Figure 6.2

Observations and Formulae Regarding Figure 6.3

Chapter 7. Quadrature – Simpson’s Rules for Areas and Centroids

Areas and Volumes

Areas of Waterplanes and Similar Figures Using Extensions of Simpson’s Rules

Volumes of Ship Shapes and Similar Figures

Appendages and Intermediate Ordinates

Areas and Volumes Having an Awkward Number of Ordinates

Centroids and Centers of Gravity


Chapter 8. Quadrature – Simpson’s Rules for Moments of Inertia

The Theorem of Parallel Axes


Chapter 9. Quadrature – Simpson


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About the Author

Bryan Barrass

Dr Bryan Barrass worked as a Ship Draughtsman for 11 years at Swan Hunters Shipyard in Wallsend. In 1963, he then became a Lecturer in Naval Architecture in Sunderland. From 1967 to 1993, he worked at Liverpool John Moores University, lecturing to Maritime Degree students, Masters, Mates, and Marine Engineers. In 1993 he retired from full-time work. He became a visiting Lecturer and has written seven books involving Ship Stability, Ship Design & Ship Performance and Ship Squat & Interaction. His interest in Ship Squat began in April 1972, starting on research for his Ph.D. degree. He has worked with many national & international Port Authorities. They include the PLA, Milford Haven PA, Liverpool PA, Humberside PA, Tyne PA, Truro PA, Newhaven PA, Bordeaux PA, Klaipeda PA, Nantes PA and Hamburg PA. Dr Barrass has supplied Ship Squat and Interaction information to 22 countries worldwide. He has lectured at a great number of UK Universities and has advised many Ship-owners on the above listed Specialist topics.

Affiliations and Expertise

International maritime consultant and lecturer in marine technology at Liverpool John Moores University, Liverpool, UK

Capt D R Derrett

Affiliations and Expertise

Formerly Head of Navigation Department at Hull Nautical College, UK


"British specialists in marine technology (Barrass) and navigation (Derrett) provide a resource for students studying for their Transport Certificates of Competency for Deck Officers and Engineering Officers and STCW equivalent international qualification. Primarily for chief mates and officers on watch on board merchant ships, it focuses on linking ship stability with ship motions."--Reference & Research Book News, October 2013
"…the book provides a comprehensive treatment of the subject with full supporting data. It is well written with clear illustrations. It can be thoroughly recommended to those at whom it is aimed and many others associated with the operation of ships will benefit from reading it."--The Naval Architect, January 2013