538

NIOHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE

Original draught ... 8ft. Oins.
Half-trim...... IJins.

New draught

A

8ft. Oins.
l^ins.

7ft. 10£in 8ft.

Given the following ship dimensions, find her coefficient of
fineness.

Ir, 450ft., B 56ft., d 24ft., displacement, 12,900 tons.
LxBxdxcoeff.

Displacement in tons

35

_Displ. x 35 _
.•.ooett. -

12900 x 35
450x56x24 ;

•74

A rectangular tank, 60 feet long, 15 feet wide, and 10 feet deep,
floats at a draught of 5 feet. The tank is divided into three equal
compartments, each 20 feet long. If the middle compartment gets
bilged what will be the new draught of the tafik ?

When a compartment gets flooded and laid open to the
sea, the mean sinkage of the vessel is equal to the volume of the
lost buoyancy divided by the area of the waterplane remaining
intact. That is to say :—
.- . , . , , Volume of portion ABOD in cubic feet.
Mean smkage in feet —^ rf ^_ar(—f CF i^quare--feet.
20x15x5 01 . ,
- 20xl5X2==;2*feet-
The new draught is 5 feet + 2£ feet = 7£ feet.
There is no change of trim, as the centre of gravity has not
changed in a fore and aft direction.