Heeling Moments in Ships - Part II — Lesson 10

This lesson covers the principles of ship stability, focusing on the heeling moments associated with grain and wind. It explains the set of rules that govern the stability conditions of a ship carrying grain, including the maximum allowable angle of heel, the required area under the GZ curve, and the minimum metacentric height. The lesson also discusses the impact of wind on a ship's stability, detailing how wind force acts on the ship's windage area and causes a heeling moment. Using illustrative examples, the lesson demonstrates how to calculate these factors and assess whether a ship meets the stability criteria.

Video Highlights

0:20 – Introduction to heeling moments and their association with grain in container ships
1:05 – Discussion on the rules regarding the maximum angle of heel due to grain shift
3:28 – Explanation of the third rule related to the metacentric height (GM)
9:00 – Explanation of the process to solve a problem related to heeling moments
37:25 – Explanation of the concept of windage area and its role in heeling due to wind
42:47 –Discussion on the assumptions made during the design stages of a ship to calculate the heeling moment due to wind

Key Takeaways

- Calculations for the maximum angle of heel due to grain shift.
- Calculations for the area between the righting arm curve and the heeling arm curve.
- The metacentric height (GM) calculations
- Wind force acts on the ship's windage area, causing a heeling moment.
- The heeling moment due to wind is calculated by multiplying the wind force by the distance between the forces.