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Beginner List and Trim in Ship Stability

Learn how to calculate the list and trim of a ship, as well as its permeability and bilging, in this free online course.

Publisher: ADU
List and trim are two vastly important concepts to ship stability. Other concepts that we cover include the centre of gravity on a ship, the righting moment and the righting lever. You will study metacentre concepts, along with the formula used to calculate the list and trim after loading. You will also learn concepts of permeability, bilging and cross-flooding arrangements once you complete this comprehensive course.
Beginner List and Trim in Ship Stability
  • Duration

    3-4 Hours
  • Students

  • Accreditation


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Keeping a vessel afloat on the open water is a challenging feat. What factors should you consider throughout a naval journey? Two measures that play a key role in your ship's stability are list and trim. In this course, you will begin studying these by first looking at the illustration, construction,and interpretation of the curve of statical stability. You will also learn about the range of stability at different angles of the keel. But what do you need to calculate to determine your ship's list and trim? You will learn about the derivation of the formula for the list, along with the internal and external factors that influence the ships’ stability.

This course will then teach you the concepts of trim and the three methods of changing it. The difference between ‘trim’ and ‘list’ will also be covered. You will learn about the stability of vessels with a deck cargo of timber. This course then explains the concepts and differences between ‘stiff’ and ‘tender’ vessels. Afterwards, you will cover the working principles of the free surface effect. You will learn about the formulas for a rectangular waterplane area with the second moment of the area around the centerline, free surface correction and free surface moment. You will also be introduced to the calculation of the free surface correction due to slack tanks. The course will discuss moving masses already on board forward or aft, as well as adding or removing masses at a position forward or aft of the centre of floatation.

Furthermore, this course explains the concepts of bilging and the four ways in which it can occur. You will learn about the bilging of the midship, intermediate side and end compartment. You will also learn about the list created by the bilging of the side compartment. This course will teach you about intact stability requirements and International Convention for the Safety of Life at Sea (SOLAS) general requirements. The importance of the damage control plan and damage stability booklet will also be covered. You will then learn about the effect of flooding and corrective actions to take and the concepts of dewatering. The functions and operations of hydraulically operated watertight doors will also be covered in this course. This in-depth look into a ship's stability will be of great interest to students, researchers and anyone with an interest in the list and trim of a vessel at sea. So register for this course and start your next learning journey today.

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