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 TM 55-1915-200-SDC
(2)
The height of center of gravity (KG) is kept at or below the limiting value, and
(3)
A proper degree of watertight integrity is maintained. Specifically, the watertight doors to the Bow
Thruster Compartment at Frame 16 and the door to the Emergency Generator Room at Frame 120 must be closed and
dogged.
5-25. STABILITY AVAILABLE. The LSV actually has excessive intact stability in all reasonable conditions of loading.
This is indicated by the high metacentric height, or GM, shown in one of the typical conditions of loading. Because of this
stability, the LSV can withstand an unusual amount of damage without assuming a dangerously large angle of heel.
The short natural period of roll observed in the LSV is a function of its high initial stability. The motion in a
seaway is apt to be quick and uncomfortable. The effect of loading cargo high in the ship in an effort to relieve this
condition will be negligible for any practical arrangement of loading. Particular care must be taken to secure all cargo
adequately to prevent shifting. A change in course or speed, if tactically possible, may reduce the amplitude of rolling.
information available to evaluate the LSV's stability is provided in the following documents:
a.
The Curves of statical stability (intact). The curve of statical stability, and its properties, are an index of
the ship's transverse stability of a given condition of loading. These properties include metacentric height (GM),
maximum righting arm (GZ) and the angle of inclination e at which it occurs, range of stability and dynamic stability. For
the LSV, the beaching condition and the full-load departure condition represent the upper and lower limits of the
operating range. Curves of intact statical stability for these conditions are shown in the Trim and Stability Booklet. On
rare occasions such as entering drydock or when lightened for retraction from a beach, the ship may approach light
condition; a curve for this case is also shown. It is evident that the range of positive stability is adequate for all normal
considerations.
b.
Damage stability calculations. At or below the drafts of 11.55 feet above the bottom of keel amidships and
13.0 feet above the bottom of keel at the after perpendicular before damage, calculations indicate that these LSVs
should be able to survive the flooding of any one compartment without loss by foundering or capsizing. As an indication
of the effects of a typical single compartment damage, the calculations after damage are furnished in the Damage
Stability Booklet. Calculations are shown for the beaching, full-load departure, and full-load arrival conditions.
5-12
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