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 TM 55-1915-200-SDC
CHAPTER 5
STABILITY AND BUOYANCY
SDC FIXES SHALL BE USED ONLY IN COMBAT OR OTHER
EMERGENCY CONDITIONS AT THE DISCRETION OF THE VESSEL
MASTER.
DAMAGES SHALL BE REPAIRED BY STANDARD
MAINTENANCE PROCEDURES AS SOON AS PRACTICABLE.
Section I. INTRODUCTION
5-1.
PURPOSE. The purpose of this chapter is to explain the stability characteristics of the Logistics Support Vessel
(LSV).
Section II. STABILITY CHARACTERISTICS
5-2.
CHARACTERISTICS.
a.
Initial stability, measured by metacentric height (GM).
See explanation of metacentric height below,
b.
Range of stability.
c.
Maximum righting arm. See below, paragraph 5-6.
d.
Angle of list at which the maximum righting arm occurs.
e. Dynamic stability.
Section III. DEFINITIONS
5-3.
METACENTER. In this discussion, the term "initial stability" refers to the tendency of the ship to right itself when
inclined to small angles of heel, say under 7 degrees.
To facilitate the determination of initial stability, the concept of metacenter is introduced. With the ship at a
given draft, the metacenter is the point of intersection of two successive lines of action of the force of buoyancy as the
ship is inclined through a very small angle. In FIGURE 5-1, point M designates the initial metacenter, that is, the
intersection of the buoyant force at 0 degrees with the line of action of buoyancy at a small angle (8) away from 0
degrees. The distance GM between the center of gravity (G) and the metacenter (M) is called the metacentric height.
5-1
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