Rise = 451.96/29.6 ⨯ 100
= 0.153m
Ta = 0.477m, Tf = 0.509m
| Fwd | Aft | |
| Draft | 8.00m | 9.38m |
| -0.153m | -0.153m | |
| +0.509m | -0.477 | |
| 8.356m | 8.750m |
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A vessel of w = 6500T, l = 120m, CF = 2mfwd of midship, MCTC = 110mt, TPC =- 15T, KM = 6.7m, KG = 6.1m at a draft of F = 4.00m A = 6.2m is floating in a drydock where the W/L is 6.5 mtrs above the top of the blocks. Calculate the residual GM of the vessel when (a) W/T is lowered by 1m. (b) it is lowered a further 1m.
Solution –
- When level lowered by 1m
Present level = 5.5m
Correction to aft draft = 2.2 ⨯ 62/120
= 1.137m
Hd ( hydrostatic draft ) = 5.063m
Since present level is 5.5m it means stern has taken to block and forward end is still afloat.
Reduction in aft draft = 0.7m
Or, 70 = P/15 + P ⨯ 62/110 ⨯ 62/12
Or, P = 195.6 tonnes
GG1 = P ⨯ KM/W
= 0.202m
GM = 0.398m
