Re: A mistake of delftship for yatch design
They all are correct. LCB means Longitudinal Center of Buoyancy. This can be either an absolute value (in your case 5.796) or a relative value in percentages. In this case the location of the LCB relativly to the mid ship section is calculated as a percentage of the waterline length. It’s easy to check with the following formula:
LCB [%]=100 * (LCB [m]– Midship location[m])/ L_{WL}[m]
I suspect that “Midships location” is what confusing.
Is it 0.5*LWL?
Is it coordinate with largest (underwater) cross sectional area?
Is it 0.5*LOA?
Is its coordinate from X=0
Is it from aft X coordinate of LWL?
Example:
Looking for LCB location in DS PRO (default model 12m, 3.7m, draft 0.5 m. After creating model, change draft to draft = 0.775m)
Draft = 0.775m
Coordinates from X=0
Base model LOA = 12m
1/2 LOA = 6m
LWL = 11.21m
1/2 LWL = 5.605m
Max Cross sectional Area “X” coordinate ~ @ 5.7m
WHICH ONE?
Just curious… Why in hydrostatics report DSPro does not give coordinate for largest cross sectional area? It gives the value for larges area, but not its coordinate…
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