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wrote:
I asked him if filling up the water and fuel tanks
would increase the AVS by a few degrees and if the
GZ curve provided by Tayana is correct.

1) The AVS has not been calculated for these lines,
however comparison of the areas above and below
the LPS, (Limiting angle of Positive Stability) do not
include the volume of deck erections, only the main
deck extended into centerline, because it is assumed
that they would not be watertright. Yes, if the tanks
were full, the area of negative stability would be
smaller, since their weight being low down, would
lower the center of gravity, and if the deck erections
were included it would reduce the area of negative
stability considerably.

2) The GZ curve was prepared based on the lines,
displacement at half load, and the vertical center
of gravity, the latter arrived at by the inclining
experiment. We stand by that curve showing an
LPS of a bit over 110 degrees. Once the VCG at
that loading is known the hull lines can be inclined
to any angle to determine the righting arm, negative
or positive.

He also said (over the phone) that an AVS of 110
degrees is fine for this type of boat and described
this boat as "stiff" (as Gary mentioned earlier).

If they don't acount for the buoyancy of the coachroof (as
some stability programs do), then a calculated LPS of 110
degrees is understandable. The coachroof/pilothouse adds a
_lot_ of buoyancy when inverted.

But you don't always go around with full tanks so don't
consider that as the best way to increase stability.

I'd feel better about the boat knowing what you do now

Evan Gatehouse

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