Class 4 (4th Engineer) SC&S 📅 Jan 2024

Exam Question

(a) Describe the function of the stern frame. (6)

(b) The water plane area of a ship at 8.4 m draught is 1670 m2. The area of successive water planes at 1.40 m intervals below this are 1600, 1540, 1420, 1270, 1080 and 690 m2 respectively. Calculate the displacement in fresh water at 8.4 m draught and the draught at which the ship would lie in sea water with the same displacement. (10)

Reference Answer

### Part (a): Function of the Stern Frame (6 Marks)
The stern frame is a critical structural member at the aft end of a ship. It is a large, robust casting or fabrication that forms the termination of the ship's hull structure. Its primary functions are multifaceted, encompassing structural integrity, propulsion, and steering.
1. **Structural Backbone**: The stern frame forms the main structural foundation for the ship's stern. It connects to the keel, shell plating, floors, and transom, providing immense strength and rigidity to the entire aft section. It is designed to withstand severe stresses, including:
* Hogging and sagging bending moments.

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