Page 288 - statbility for masters and mates

276 Ship Stability for Masters and Mates
IOZ 19 CI S3
19 2 1580 351 m4
ICG IOZ A(CG)2 IWL ICG A z2
IOZ A (CG)2 A z2
IOZ A(CG2 z2)
351 45:33 2:3242 4:3242
IWL 953:75 m4 y IWL
A z
953:75
45:33 4:324 y 4:87 m
Ans. The Centre of Pressure is 4.87 m below the waterline.
Summary
When using Simpson's Rules to estimate the area of a bulkhead under liquid pressure together with the VCG and centre of pressure the procedure should be as follows:
1 Make a sketch from the given information.
2 Make a table and insert the relevant ordinates and multipliers.
3 Calculate the area of bulkhead's plating.
4 Estimate the ship's VCG below the stipulated datum level.
5 Using the parallel axis theorem, calculate the requested centre of
pressure.
6 Remember: sketch, table, calculation.