Abstract: Improvement in water craft of single-hull type or multi-hull type and having a drive apparatus or a hub (7) carrying a ventilated propeller (6) of so called “surface piercing” type, in which the drive or the hub (7) with the surface piercing propeller (6) is mounted close to the end of a fin like hull body (4), or a fin like part of an integral hull body, preferably having an elongated torpedo like (11) bottom body, and which fin like body (4) is so deep that the propeller (6), at all speeds of the ship, operates entirely under water, and in which the rear end of the conical fin body (4, 11) extends transversally to the longitudinal direction of the ship and has an average width in this direction which is substantially less than the diameter of the propeller (6). The torpedo like body (11) may have a front cone which can be expelled some distance in front of the torpedo body (11).