Fast ship

A ship comprising a hull with a waterline length and a mechanical propulsion device for generating a maximum speed, whereby the hull and the propulsion device are designed such that the Froude number (v/√{g*L}) is larger than 0.5, the hull has a foreship with a bow and an aft ship with a stern, in the aft ship the hull has a bottom with V-shaped bottom surfaces that in the immersed part of the hull extend symmetrically upwards with a deadrise angle that is less than 40 degrees and above the water level the hull has substantially vertical sides, in the hull are a passenger compartment and a trim tank with a trim tank volume characterized in that the trim tank volume is such that the weight of a filled trim tank is more than 30% of the weight of displacement of the hull with an empty trim tank, that the hull is designed such that filling the trim tank with water increases the amidships immersed width or beam of the hull when stationary in the water with at least 10%, and that in the aft ship the bottom surfaces have bilge keels located such that the bilge keels are fully immersed when the trim tank is filled with water and the bilge keels are at least in part above the water level when the trim tank is empty.