Class 4 (4th Engineer) SC&S 📅 Nov 2025

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 and robust structural member located at the aft end of the ship. It is a large casting or fabrication that forms the termination of the hull structure. Its primary functions are multifaceted, encompassing structural support, propulsion, and steering.
#### 1. Structural Integrity and Support
* **Termination of Hull Girder**: The stern frame forms the backbone of the ship's aft end, connecting the keel, shell plating, and transom floors into a rigid structure.

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