Page 296 - statbility for masters and mates
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284 Ship Stability for Masters and Mates
Ship type
ULCC Supertanker Oil tanker Bulk carrier
Typical CB, fully loaded
0.850 0.825 0.800 0.750
Ship type
General cargo Passenger liner Container ship Coastal tug
Typical CB, fully loaded
0.700 0.625 0.575 0.500
Fig. 31.4. Maximum ship squats in con®ned channels and in open water con- ditions.
Worked example ± ship squat for a supertanker
Question:
A supertanker operating in open water conditions is proceeding at a speed of11knots.HerCB 0:830,staticeven-keeldraft 13:5mwithastatic underkeel clearance of 2.5m. Her breadth moulded is 55m with LBP of 320 m.
Calculate the maximum squat for this vessel at the given speed via two methods, and her remaining ukc (underkeel clearance) at Vk of 11 kts.
Answer:
; `B' 455m;
i.e. arti®cial boundaries in open water or wide rivers
Width of influence f7:7 20 1 CB 2g b `B' ; `B' f7:7 20 1 0:830 2g 55
