Abstract
This chapter discusses the stability regulations of the German Federal Navy. The longitudinal and quartering waves affect stability by changing the instantaneous moment of inertia that enters into the calculation of the metacentric radius. This effect is taken into account in the stability regulations of the German Federal Navy and it has been proposed to consider it also for merchant ships. German researchers were the first to investigate parametric resonance in ship stability. They also took into consideration this effect when they elaborated stability regulations for the German Federal Navy. These regulations require that the righting arm be calculated both in still water and in waves. Traditionally ship forms have been chosen as a compromise between contradictory requirements of reduced hydrodynamic resistance, good seakeeping qualities, convenient space arrangements and stability in still water. The study of the Mathieu effect has added another criterion: small variation of righting arms in waves.
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