P = 2526 tonnes
GG1 = P ⨯ KM/W
= P ⨯ KM/(W – P)
= 1.301m
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A ship length 200m LCF 5m forward of amidships is being docked at draughts F 7.35m A 9.15m. W 38700 tonnes, TPC 48, MCTC 360, KG 7.46m.
Find : (i) The GM when flat on the blocks if KM then is 8.20m.
(ii) The draught when flat on the blocks.
(iii) The GM when the draught is 7.8m if KM is then 8.30m.
(iv) The draught at which the ship becomes unstable.
Solution –
- When flat on blocks change in trim = 1.800m
P = 1.8 ⨯ 360/105
= 6.171m ⨯ 100
= 617.1 tonnes
GG1 = P ⨯ KM/W
= 617.1 ⨯ 8.20/38700
= 0.131m
New GM = 0.609m
- Correction to aft draft = 1.800 ⨯ 105/200
= 0.945m
Hd = 8.205m
Rise = P/TPC ⨯ 100
= 0.128m
