Noises due to the vibrations of the components or structure of boats are inevitably conducted by the vibrations of the engines fitted on them.

In order to soften the transmition of vibrations from engines to hulls as much as possible, engines are usually mounted on engine bearers that are in turn fixed to the hull, with special engine mounts - flexible bushes - in between the engine and the bearer so that vibration is absorbed before reaching the hull. Today some special and very effective units, based on anisotropic characteristics of some materials looking like a solid gel, have been developed.

Even if the engine vibrations are well insulated from the hull, unfortunately, in all fixed-shaft installations there is another path along which the vibration can be transmitted to the hull. The shaft itself fits snugly in a tube which is fixed to the hull. If the engine and shaft are not perfectly aligned, or indeed if they are and the engine is prone to significant vibration, the vibration will travel along the shaft, into the tube and then into the structure of the hull.

In these cases, the only solution is to fit a coupling between the engine and the shaft which performs an equivalent function to the engine mounts, absorbing the vibration before it gets to the hull. There are some well performed products on the market and will be glad to provide its Customers some helpful advices about them.

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