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

Exam Question

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

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

Reference Answer

### (a) Various Resistances Acting Against the Motion of the Ship (6 Marks)
The total resistance experienced by a ship moving through water is a complex combination of several components. For a full understanding, these are categorized as follows:
1. **Frictional Resistance:** This is a component of viscous drag caused by the friction between the wetted surface of the ship's hull and the layer of water immediately in contact with it (the boundary layer).
* **Mechanism:** It arises from the shear forces due to the viscosity of the water.

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