Page 425 - statbility for masters and mates

SHIP STABILITY
Attempt ALL questions
Marks for each question are shown in brackets
1. Ship `A' has a displacement of 14 000 tonne and a KG of 8.20 m.
Using Datasheets Q.1 Tabulated KN Values and Hydrostatic Particulars, determine whether the vessel complies with the stability requirements of the current Load Line Rules. (35)
2. A box shaped vessel ¯oating at an even keel in salt water has the following particulars:
Length 75.00 m Breadth 18.00 m Depth 11.0 m Draft 6.00 m KG 6.80 m
An empty midship watertight compartment 15.00 m long is bilged. Calculate EACH of the following:
(a) (b) (c)
3. (a) (b)
4. (a) (b)
the new draft; (8) the GM in the ¯ooded condition; (12) the righting moment at an angle of 16 degrees. (15)
Describe, with the aid of a sketch, the forces that cause a vessel to heel when turning. (12) A vessel turns in a circle of diameter 200 m at a speed of 16 knots. GM 0.78 m. BG 0.88 m. g 9.81 m/sec2 (Assume 1 knot
1.8532 km/hr).
Calculate the angle of heel due to turning. (18)
Describe the hydrostatic, stability and stress data required to be supplied to ships. (30) A maximum draft forward is sometimes stated in the above data
when supplied to the ship under the Load Line Rules.
State the reason for this limitation. (5)
5. A vessel with a high deck cargo will experience adverse effects on its stability due to strong beam winds on lateral windage areas.
With the aid of a sketch, show the minimum stability requirements, with respect to wind heeling, under current regulations. (35)
6. With regard to the inclining experiment:
(a) (b)
(c)
state its purpose; (5) describe the precautions to be taken before and during the experiment; (16)
list the circumstances when the experiment is required to take place. (9)
Specimen examination papers 413