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 TM 55-1905-223-SDC
Initial Metacenter with Line of Action Buoyancy Angled
Away From 0.
RIGHTING ARM. When the ship is upright, the water line is WL and the forces will act as shown in
FIGURE 5-1. When the ship is inclined, however, the water line becomes W1 L1, which changes the shape of
the underwater body. As a result, the center of buoyancy moves from B to a new position B1, and the weight
and buoyancy no longer act in the same vertical line. Examination of the figure will show that a righting arm or
restoring moment is now present, which tends to rotate the ship toward its original position. The distance GZ
is the righting arm.
a.
The ship in FIGURE 5-2 develops positive righting arms from -Θ to C, that is, from 0 degrees to 71
degrees. This series of angles through which the ship has positive righting arm is called the range of stability.
It indicates the extreme angle to which the ship can roll
Stability Curve Indicating Maximum GZ
5-2
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