The first three factors determine static stability. This is usually shown as a plot of "Righting Arm" VS "Heel Angle", as is shown in Figure 1. The length of the righting arm is the horizontal distance between the buoyant force and the center of gravity. The "Restoring Moment", which represents stability, is simply the product of the righting arm and the displacement. The righting arm begins at zero, increases to a maximum at around 40 degrees of heel, and then decreases until it reaches zero again around 130 degrees. The heel angle where the righting arm goes back to zero is referred to as the "Angle of Positive Stability". When that angle is exceeded, the boat capsizes.