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The highly flexible RATO-DS coupling has been specially designed for use in installations requiring a high level of torsional flexibility and medium level of misalignment capacity. Supplementing the "all-round" RATO-S the RATO-DS has been developed to offer an application - orientated coupling design. Specially for rigidly mounted ship´s main propulsion. The 3 available stiffnesses enable a good tuning of the system with respect to both the transient and steady-state torsional vibration response. In the tradition of VULKAN couplings, a backlash free torque transmission is achieved. When required a torque limiting device can be fitted. The normal misalignments caused by foundation deflections, heat etc. can be adequately compensated for by the radial, axial and angular flexibility of the RATO-DS. Dynamic safety was the prime consideration in the design of the RATO-DS coupling. This is reflected in the element in the element shape - mechanical and thermal capacity and by using a friction loaded bolting arrangement. The large ventilation holes located in the couplings metal parts ensure that any heat generated in the coupling is effectively removed. The advantages of the compact dimensions together with the possibility of radial removal of the element leads to a weight efficient coupling assembly in the drive system.