Page 274 - statbility for masters and mates

262 Ship Stability for Masters and Mates
84 18 25:8 6
9:77 m
0:77 m aft of amidships
IAB AX 2
5983 51:6 9:772
5983 4925
Ans. IOZ 1058 metres4
There is a quicker and more ef®cient method of obtaining the solution to the above problem. Instead of using the foremost ordinate at the datum, use the midship ordinate. Proceed as follows:
13 CI 3 S3 2 1 18 3
IAB
3 6 332:4 2 5983 m4
IOZ
12 ord. 0
1.2 1.5 1.8 1.8 1.5 1.2
SM Area func. Levere 1 0 3
4 4.8 2 2 3.0 1 4 7.2 0 2 3.6 1 4 6.0 2 1 1.2 3
Moment func.
0 9:6 3:0
Levere 3
2
Inertia func.
0 19:2
3:0 0 3:6
24:0 10:8
1 0 0
3:6 12:0 3:6
1 2 3
25:8 S1
Area of waterplane 1 S1 h 2
60:6 S3 h 18 3 m
6:6 S2 36
13 25:8 3 2 51:6 m2 (as before)
S2 6:6
The ve sign shows Centre of Flotation is in aft body
Centre of Flotation from e S2 h S1
6:6 3 25:8