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 TM 55-1905-223-SDC
Section XI.
CURVE OF RIGHTING LEVERS
5-37. INTRODUCTION. FIGURE 5-5 shows the variation of righting arms (GZ), with an angle of heel, for
an assumed height of center of gravity (KG) of 11.7 feet above bottom of keel amidships. For any condition of
loading in which displacement and KG are known, a curve of intact statical stability can be developed. This
curve is for the beaching condition. FIGURES 5-6, 5-7, and 5-8 are for the full-load departure, full-load arrival,
and light ship condition respectively.
As an example, the curve of intact statical stability for the beaching condition was developed.
Given:
Displacement
876.22 Tons
KG (Uncorrected)
11.68 Feet
Free Surface Correction
0.36 Feet
KG (Corrected)
12.04 Feet
Angle
Righting Arm
10 Deg
3.20 Feet
20 Deg
5.50 Feet
30 Deg
5.74 Feet
40 Deg
5.05 Feet
50 Deg
3.42 Feet
Maximum Righting lever GZ = 5.80 Feet at 27.5 degrees.
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