A cooling system for a water-borne vessel (1, fig 1) is disclosed comprising a strut 5 for supporting a propeller shaft (4, fig 1) of the vessel, the strut comprising a fluid inlet 8, a fluid outlet 9, and a channel 10 inside the strut for transporting fluid between the fluid inlet and fluid outlet, one or more fluid conduits (14, fig 4) coupling the fluid inlet and outlet to a component to be cooled (15, fig 4), and a pump (13, fig 4) for circulating a fluid through the conduits and said channel. The strut is configured to attach to the vessels hull. The strut may comprise a bearing for supporting the propeller shaft and facilitating its rotation. The vessel may be driven by an electric motor and the cooling system may be used to cool the motor or batteries. There is also disclosed a strut for supporting a propeller shaft comprising the above elements. Further disclosed are a vessel incorporating the above cooling system and a method of cooling an inboard component of a water craft which comprises pumping a fluid into and out of a strut which supports the crafts propeller shaft.
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