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

Exam Question

(a) What do you understand by 'coffin' plate? (6)

(b) A ship displacing 10000 tonne and travelling at 16 knots has a fuel consumption of 41 tonne per day. Calculate the consumption per day if the displacement is increased to 13750 tonne and the speed is increased to 17 knots. Within this speed range, fuel consumption per day varies as (speed)^3.8 (10)

Reference Answer

### Part (a): 'Coffin' Plate
#### 1. Definition and Location
A 'coffin' plate is a specific steel plate forming part of the inner bottom plating (tank top) of a ship. It is located at the extreme aft end of the machinery space, just forward of the aft peak bulkhead and immediately forward of the entrance to the propeller shaft tunnel. It forms the top plate of the aft drain well or cofferdam.
#### 2. Shape and Etymology

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