Abstract: A sailing craft including a hull assembly (1,2), keel (3) and turret assembly (5) connected to the hull assembly (1, 2), for rotation about an axis. Turret assembly (5) is adapted to carry the craft's crew. The craft further includes mast (7) connected to and projecting from turret assembly (5) and sail assembly (8, 9, 10) connected to mast (7) in spaced relation to turret assembly (5). Sail assembly (8, 9, 10) includes sail member (8) which is movable relative to mast (7) for propelling the craft. Sail assembly (8, 9, 10) further includes wind vane (10) operable to position sail member (8) with respect to the wind direction. Sail member (8) may comprise an aerofoil shaped body. The combined center of mass of turret assembly (5), sail assembly (8, 9, 10) and the crew is designed to lie close to the rotational axis of turret bearing (6) while sailing.

Abstract: A sailing craft including a hull assembly (1,2), keel (3) and turret assembly (5) connected to the hull assembly (1, 2), for rotation about an axis. Turret assembly (5) is adapted to carry the craft's crew. The craft further includes mast (7) connected to and projecting from turret assembly (5) and sail assembly (8, 9, 10) connected to mast (7) in spaced relation to turret assembly (5). Sail assembly (8, 9, 10) includes sail member (8) which is movable relative to mast (7) for propelling the craft. Sail assembly (8, 9, 10) further includes wind vane (10) operable to position sail member (8) with respect to the wind direction. Sail member (8) may comprise an aerofoil shaped body. The combined centre of mass of turret assembly (5), sail assembly (8, 9, 10) and the crew is designed to lie close to the rotational axis of turret bearing (6) whilst sailing.

Abstract: In a nutating machine such as a high intensity comminution machine having a nutating drum (1), a support bearing is provided by pairs of rolling bearing surfaces (6 and 8, and 7 and 9). In order to reduce power requirements and wear, each pair of complementary contact paths traced out by the bearing surface pairs has an equal ratio of (a) the path length of the stationary bearing surface (8, 9) to (b) the path length of the nutating bearing surface (6, 7). In one embodiment, irrotational movement of the nutating element is achieved by having equal path lengths as between the stationary bearing surface and the nutating bearing surface in both pairs.