A ballast seal for a sealing ring includes: a substantially annular potential equalization ring made of an electrically-conductive material and which can be brought into contact in a sealing manner with a surface to be sealed of a machine element to be sealed; and at least one shielding ring made of a soft magnetic material so as to shield against electromagnetic interfering waves.

The present invention relates to a winged boat comprising a main body including a passenger space and a closed space at an edge, buoyant wing parts protruding from both sides of the main body, disposed in a front and a rear area of the main body, and each including a wing body protruded from a side of the main body; a buoyant space formed inside the wing body in a closed state; a water storage part disposed in an opposite direction to the main body with respect to the buoyant space and having an opening and closing part at a lower portion and an inlet formed at an upper portion, and a buoyancy control part provided in an opposite direction to the buoyant space with respect to the water storage part and adjusting buoyancy of the wing body by controlling an amount of water stored therein.

An autonomous sailing vessel may include a hull, a mast, a sail, and a rudder. The mast may be mechanically coupled to the hull. The sail may be mechanically coupled to the mast. The rudder may be mechanically coupled to the hull. A heading of the autonomous sailing vessel may be regulated by actively controlling the rudder without actively controlling the sail. Alternatively or additionally, the autonomous sailing vessel may include an anticapsize stabilizer tank, a lidar system, and/or marine mammal monitoring and identification.

An autonomous sailing vessel may include a hull, a mast, a sail, and a rudder. The mast may be mechanically coupled to the hull. The sail may be mechanically coupled to the mast. The rudder may be mechanically coupled to the hull. A heading of the autonomous sailing vessel may be regulated by actively controlling the rudder without actively controlling the sail. Alternatively or additionally, the autonomous sailing vessel may include an anticapsize stabilizer tank, a lidar system, and/or marine mammal monitoring and identification.

A ballast seal for a sealing ring includes: a substantially annular potential equalization ring made of an electrically-conductive material and which can be brought into contact in a sealing manner with a surface to be sealed of a machine element to be sealed; and at least one shielding ring made of a soft magnetic material so as to shield against electromagnetic interfering waves.

A sailboat is described having a boat hull (1), two flow profiles (2, 3) protruding laterally from the boat hull (1), and at least one underwater hydrofoil (16). To be able to achieve high travel velocities while maintaining the stability of the sailboat and balanced control behavior, it is proposed that the flow profiles (2, 3) protrude outward in a V shape from the boat hull and each have an aerodynamic stabilizer forming an aerodynamic aileron (4, 5), and/or the at least one underwater hydrofoil (16) is provided with a hydrodynamic stabilizer forming a hydrodynamic aileron.

A stabilizer that extends from the hull of a watercraft below the waterline when needed is disclosed. The stabilizer produces added drag on the watercraft's counteracting a tendency to change bearing. Stabilization chambers of the stabilizer hold semi contained water to produce an extended drag effect by adding lateral weight due to the water that is semi contained within the chamber during use. The restricted flow of water into and out of the stabilizer and the outer dimensions of the stabilizer provides lateral drag to mute any ambient drift.

A sailboat is described having a boat hull (1), two flow profiles (2, 3) protruding laterally from the boat hull (1), and at least one underwater hydrofoil (16). To be able to achieve high travel velocities while maintaining the stability of the sailboat and balanced control behavior, it is proposed that the flow profiles (2, 3) protrude outward in a V shape from the boat hull and each have an aerodynamic stabilizer forming an aerodynamic aileron (4, 5), and/or the at least one underwater hydrofoil (16) is provided with a hydrodynamic stabilizer forming a hydrodynamic aileron.

A stabilizer that extends from the hull of a watercraft below the waterline when needed is disclosed. The stabilizer produces added drag on the watercraft's counteracting a tendency to change bearing. Stabilization chambers of the stabilizer hold semi contained water to produce an extended drag effect by adding lateral weight due to the water that is semi contained within the chamber during use. The restricted flow of water into and out of the stabilizer and the outer dimensions of the stabilizer provides lateral drag to mute any ambient drift.