Class 4 (4th Engineer) SC&S 📅 Feb 2023

Exam Question

(a) What are the various resistances acting against the motion of the ship? (6)

(b) A Vessel of 10000 t Displacement burns 25t of fuel per day when her speed is 12 knots. Calculate the probable consumption of fuel oil over a voyage of 3000 nautical miles at a speed of 11 knots with a displacement of 11000t (10)

Reference Answer

### (a) Various Resistances Acting Against the Motion of the Ship
The total resistance experienced by a ship moving through water is the sum of several distinct components. Understanding these is crucial for efficient hull design and power plant selection. For a full score, each component must be detailed with its contributing factors.
1. **Frictional Resistance:**
* **Concept:** This resistance arises from the friction between the ship's hull wetted surface and the layer of water in immediate contact with it. It is a viscous drag effect within the boundary layer surrounding the hull.

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