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

Exam Question

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

(b) A vessel uses 300 t of fuel on a voyage of 3000 nautical miles at a speed of 12 knots when her displacement is 10000 t. Estimate the fuel required for an estimated voyage of 1500 nautical miles at a speed of 15 knots and displacement of 14000 t. (10)

Reference Answer

### (a) Various Resistances Acting Against the Motion of the Ship (6 Marks)
The total resistance (R_T) experienced by a ship moving through water is the sum of several components. Understanding these is crucial for efficient hull design and power plant selection. The primary components are:
**1. Frictional Resistance (R_F):**
This is the most significant component of resistance for most merchant vessels, especially at lower speeds (e.g., tankers, bulk carriers). It arises from the friction between the wetted surface of the hull and the water flowing past it.

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