A device comprises a spring and a sleeve. The spring is configured to form a closed loop. The spring is moveable between a coiled configuration when the spring is collapsed and an uncoiled configuration when the spring is expanded. The spring defines a circumference while in the uncoiled configuration. The spring is disposed within the sleeve.

A personal propulsion device, including a platform configured to support a passenger's body; and at least one fluid discharge nozzle coupled to the platform and angled with respect to the platform, where the angle defined between the nozzle and the platform is between approximately 95° and 120°; where the personal propulsion device is configured to receive pressurized fluid from a remote pressurized fluid source, and where the personal propulsion device is configured to achieve flight.

A watercraft comprising: a chassis; a drive means; a hydrofoil; and a drive transfer arm, wherein the drive means is operatively connected to a first end of the drive transfer arm, and the hydrofoil is pivotably connected to a second end of the drive transfer arm, the watercraft configured such that operation of the drive means causes the hydrofoil to oscillate, to provide thrust.

A vehicle for conveying a rider within a tubular track comprises a support portion for supporting the rider and a retaining body adapted to retain the support portion against an interior wall of the tubular track. The retaining body has a sliding surface for slidable engagement with the wall of the tubular track. The support portion and the retaining body have a vehicle axis of movement about which the vehicle may rotate within the tubular track. An apparatus for transporting a rider comprises a tubular track having an interior wall and at least one vehicle.

A water mat assembly having selectively attachable modular panels is disclosed. The water mat comprises a buoyant solid core insert that is inserted into a sleeve made of fabric. The sleeve may be couple to other sleeves to form an assembly of floating panels. The end panels may have grommeted ports for tethering the mat assembly to a dock or water vehicle.

Wakeboat hull control systems are provided that can include a first accelerometer operatively associated with the hull of the wakeboat to measure the acceleration of the hull along a first axis; a second accelerometer operatively associated with the hull of the wakeboat to measure the acceleration of the hull along a second axis, the first axis being non-parallel to the second axis; and processing circuitry calculating the rotation of the hull of the wakeboat about a third axis based on the acquired measurements. Wakeboat hull control methods are provided that can include using the processing circuitry to calculate the rotation of the hull of the wakeboat about a third axis based on the acquired measurements.

A boat comprising a wake shaping system comprising starboard and port wake shaping devices located aft of the transom. Each wake shaping device is operable to move between a first, non-deployed position behind the transom and a second, deployed position extending outside the side of the hull or below the transom. When the starboard wake shaping device is in the deployed position, a port wakesurf wake is created. When the port of the wake shaping device is in the deployed position, a starboard wakesurf wake is created. When neither wake shaping device is deployed, a symmetrical wakeboard wake is created.

A light display system and device for use in a body of water or other liquid is described. The light display device may be controlled remotely via a control hub and/or control panel, or controlled by internally preprogrammed commands. A plurality of light display devices may be controlled in selected, choreographed sequences to provide various unique visual displays including, for example, geometrical patterns and/or naturalistic patterns giving the impression of organic phenomena such as swarming fireflies, bioluminescent creatures and the like.

A water toy comprising a foam tube having a first end, a second end and a body therebetween, an optional seat positioned on the body, a first feature attached to the first end, and a second feature attached to the second end, the first and second features being aesthetic and/or functional and/or a combination of the same.

A jet propulsion watercraft includes a vessel body, a steering nozzle, and a bucket. The steering nozzle includes a jet port from which a jet of water is ejected to propel the vessel body. The bucket is configured to move to a retracted position away from the jet of water ejected from the jet port and a jet receiving position to receive the jet of water ejected from the jet port. The bucket includes a right opening, a left opening, a first opening, and a second opening spaced apart from the first opening. The jet of water flows rightward from the right opening, leftward from the left opening, and rearward from the first opening and the second opening when the bucket is located in the jet receiving position. The first opening is located at least partially rightward of a right end of the jet port. The second opening is located at least partially leftward of a left end of the jet port.