Page 428 - statbility for masters and mates

416 Ship Stability for Masters and Mates
Calculate how much of the cargo should be loaded in the:
(i) tween deck;
(ii) hold (35)
2. The GZ values of a vessel at a certain displacement are as shown:
Heel (y ) 0 15 30 45 60 GZ (m) 0 0.27 0.73 0.95 0.61
KM: 9.00 m KG 8.20 m
75 0.06
(a) Plot the GZ curve on the graph paper provided.
(b) Calculate the area under the curve between 0 and 30 using
Simpson's Rules. (15)
(c) Show that the curve satis®es the stability criteria required by the Load Line Rules 1968. (10)
3. MV Mexna (2) is ¯oating at draughts 6.40 m forward and 7.60 m aft. Using the hydrostatic data provided (Worksheet Q.3) calculate:
(a) the amount of ballast to load into the forepeak tank (c.g. 60m forward of amid-ships) so that the draught aft is 7.30 m; (25)
(b) the ®nal draught forward. (10)
4. Explain with reference to a well labelled sketch, how the effect of free surface can be considered as a reduction in a vessel's metacentric height. (35)
5. (a) List the requirements of the Load Line Rules 1968, relating to weathertight doors. (10) (b) Describe the maintenance and testing of a superstructure door in order to ensure weathertightness. (20)
6. Illustrate by means of labelled half mid-section sketches each of the following framing systems:
(i) Transverse; (10) (ii) Longitudinal; (10) (iii) Combination. (10)
(10)