An underwater propulsion device is disclosed comprising two sleeves for fitting around each of a user's lower legs, with each sleeve mounting a propulsion unit, and the sleeves being connectable by a bar between them during underwater operation of the device by the user.

An underwater propulsion device is disclosed comprising two sleeves for fitting around each of a user's lower legs, with each sleeve mounting a propulsion unit, and the sleeves being connectable by a bar between them during underwater operation of the device by the user.

A combined paddle and pump can be used to propel a small boat. The handle telescopes with a locking nut that may be loosened to allow extension and retraction of the handle. The handle is hollow throughout and a pair of check valves are provided. One check valve opens when the handle is extended and the other opens when the handle is retracted. When one check valve is open, the other is closed. When the distal end of the paddle is placed within a volume of water, extension and retraction of the handle results in a liquid first being sucked into the hollow interior of the handle and then propelled out of the handle.

A combined paddle and pump can be used to propel a small boat. The handle telescopes with a locking nut that may be loosened to allow extension and retraction of the handle. The handle is hollow throughout and a pair of check valves are provided. One check valve opens when the handle is extended and the other opens when the handle is retracted. When one check valve is open, the other is closed. When the distal end of the paddle is placed within a volume of water, extension and retraction of the handle results in a liquid first being sucked into the hollow interior of the handle and then propelled out of the handle.

The invention relates to a vessel (1) comprising a hull (2) for non-planing operation, during operation displaying a waterline (3) and having a forward direction in a horizontal plane (4) with a forward portion, an aft portion (5), and a central portion, the aft portion having a smaller water displacement relative to a water displacement of the central portion; and an aft, primary foil (6) affixed to the aft hull portion with a connecting member (7), configured to be below the waterline during operation, spaced from the hull, the aft foil having a span, a chord, a profile, a leading edge (8) and a trailing edge (9) relative to the forward direction, characterized by adjustment means (10) connected to the aft foil and configured for adjusting an angle of incidence (.sub.c, af) of the chord of the aft foil.

The invention relates to a vessel (1) comprising a hull (2) for non-planing operation, during operation displaying a waterline (3) and having a forward direction in a horizontal plane (4) with a forward portion, an aft portion (5), and a central portion, the aft portion having a smaller water displacement relative to a water displacement of the central portion; and an aft, primary foil (6) affixed to the aft hull portion with a connecting member (7), configured to be below the waterline during operation, spaced from the hull, the aft foil having a span, a chord, a profile, a leading edge (8) and a trailing edge (9) relative to the forward direction, characterized by adjustment means (10) connected to the aft foil and configured for adjusting an angle of incidence (.sub.c, af) of the chord of the aft foil.

In accordance with some embodiments, a method is performed at a device with one or more processors, non-transitory memory, and a display. The method includes, while the device is in communication with an alert system integrated into a vehicle that is operating with at least a respective degree of autonomous control, displaying, on the display, a user interface that is unrelated to operating the vehicle. The device is a handheld device that is separate from the vehicle. The method includes, while displaying the user interface on the display, receiving, from the alert system integrated into the vehicle, an alert indication that a driver's attention is needed for operating the vehicle. The method includes, in response to receiving the alert indication, disabling at least a portion of the displayed user interface and displaying, on the display, a visual indication that the driver's attention is needed for operating the vehicle.

An autonomous lifebuoy includes a body, an electric power supply, a propelling module and a control unit configured to control the autonomous lifebuoy so as to automatically guide the autonomous lifebuoy towards a person overboard in water, during a man overboard (MOB) situation. The control unit includes at least one communication module, a graphics processing unit (GPU) for comparing pre-recorded images of the autonomous lifebuoy itself and a person overboard, pre-recorded in non-volatile memory, with images received, by way of the at least one communication module, from at least one of a local area network (LAN), a camera and a smartphone camera, each in proximity of the autonomous lifebuoy and a microcomputer for making calculations, based on at least the image comparison of the graphics processing unit (GPU), and issue commands to at least the propelling module to propel the autonomous lifebuoy towards the person overboard in the water.

An autonomous lifebuoy includes a body, an electric power supply, a propelling module and a control unit configured to control the autonomous lifebuoy so as to automatically guide the autonomous lifebuoy towards a person overboard in water, during a man overboard (MOB) situation. The control unit includes at least one communication module, a graphics processing unit (GPU) for comparing pre-recorded images of the autonomous lifebuoy itself and a person overboard, pre-recorded in non-volatile memory, with images received, by way of the at least one communication module, from at least one of a local area network (LAN), a camera and a smartphone camera, each in proximity of the autonomous lifebuoy and a microcomputer for making calculations, based on at least the image comparison of the graphics processing unit (GPU), and issue commands to at least the propelling module to propel the autonomous lifebuoy towards the person overboard in the water.

A robotic jellyfish comprises a torque reaction engine and a jellyfish body, wherein the torque reaction engine cyclically oscillates and causes a wave to propagate across the jellyfish body, accelerating thrust fluid and propelling the robotic jellyfish.