Poseidon has a series of flexible couplings: Poseidon and Orion series. These couplings make that the propeller shaft is mounted flexibly on gearbox/engine units while passing on thrust. It creates a smoother ride.
Alternatively, when a thrust block is used these couplings do not have to be absorbed by the thrust. This creates an even quieter and smoother propulsion system. These units are available from 10 up to 3000 kW applications