Page 436 - statbility for masters and mates

424 Ship Stability for Masters and Mates
SHIP CONSTRUCTION AND STABILITY
Attempt ALL questions
Marks for each question are shown in brackets
1. All parts of question 1 carry equal marks.
(a) De®ne Transverse Metacentre.
(b) De®ne Statutory Freeboard.
(c) StatethemeaningofwatertightasgivenintheLoadLineRules1968. (d) A ship of displacement 15 000 t is heeled 3 . Given KG 8.46 m and
KM 9.36 m determine the Righting Moment. (e) Use Datasheet Q.1(e).
The ship, length 145 m, is ¯oating in fresh water at drafts 4.30 m Forward and 6.30 m Aft. Determine the ship's displacement. (35)
2. Use Datasheet Q.1(e).
The ship, at displacement 6950 t, KG 7.80 m loads the following:
2800tatKg 3.79m 3400 t at Kg 6.86 m 900t at Kg 8.89m 500 t at Kg 10.30 m
On passage it is anticipated that 950 t of fuel and fresh water will be used from Kg 2.85 m producing a free surface moment of 414 t m.
Calculate the GM on arrival. (30)
3. Use Datasheets Q.1(e) and Q.3.
The ship is at displacement 11 750 t, KG 8.00 m.
(a) Draw the GZ curve for the ship in this condition. (20)
(b) Using the curve drawn in Q.3(a), estimate EACH of the following:
(i) the angle of vanishing stability. (ii) the angle of deck edge immersion.
(iii) the maximum GZ and the angle at which it occurs. (10)
4. Use Hydrostatic Datasheet Q.1(e).
The ship, length b.p. 140 m, is at drafts 6.10 m Forward and 6.50 m Aft. 100 t of ballast, already on board, is to be moved 85 m forward.
(a) Calculatetheposition,withreferencetoamidship,atwhich227tof cargo should be loaded so that the ship ®nishes on an even keel.(20)
(b) Determine the ®nal draught. (10)
5. A ship of displacement 9500t ¯oats upright in still water with KG 8.84 m and KM 9.96 m.
On passage containers of weight 65 tonne are lost overside from a position Kg 12.0 m, 10.5 m to port of the centreline.
Calculate the list to be expected giving the direction. (25)