I am calculating the stability for the crane lifting requirements in 46CFR
173.025 for a vessel on exposed waters using counterballast.
How do I include the factor "K" in my calculation. The requirement is
A2 > A1 + K. Using the residual ratio limit I can determine A2/A1, but
I haven't been able to figure out how to include "K" in my calculation.
Do you have any advice or an existing run file to do these calculations?
Since 46CFR 173.025 is really wanting the residual area from "theta(c)" to
"theta(f)" to be at least "K" (A2 - A1 > K), you can use the LIMIT AREA
LIM AREA FROM 0 TO FLD > 7.0
STATUS `<-- if you want to show the condition before dropping the load
DELETE "HOOK LOAD"
SOLVE TRIM | STATUS `<-- shows the condition immediately after dropping load
RA 0 2.5p /LIM `<-- change the "p" to "s" if heeled to port with load
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