The invention discloses an emergency life-saving device applicable to a wide area water surface. The body is provided with a bottom plate slot opening downward, and left and right sides of the bottom plate slot are symmetrically provided with a power cavity opening downward. The top side of the power cavity is provided with a bevel gear cavity, and the bevel gear cavity and the power cavity are provided with a power device for driving the body to advance and turn. Push down. Compared with traditional life buoys, this device cannot automatically assist people to move. This device can automatically move people with the water down. While moving, it can also automatically control the direction and deceleration. The performance is greatly improved. At the same time, the device can still help people to swim forward when there is no electricity.

The invention discloses an emergency life-saving device applicable to a wide area water surface. The body is provided with a bottom plate slot opening downward, and left and right sides of the bottom plate slot are symmetrically provided with a power cavity opening downward. The top side of the power cavity is provided with a bevel gear cavity, and the bevel gear cavity and the power cavity are provided with a power device for driving the body to advance and turn. Push down. Compared with traditional life buoys, this device cannot automatically assist people to move. This device can automatically move people with the water down. While moving, it can also automatically control the direction and deceleration. The performance is greatly improved. At the same time, the device can still help people to swim forward when there is no electricity.

The invention disclosed herein is a device, method of use and kit for measuring and precisely setting the dimensions in wheeled and tracked devices or vehicles. It is particularly well-suited for rowing boats and simulators thereof, including but not limited to sweep rowing and sculling watercraft. It introduces a novel gauge and process to adjust wheels within tracked environments to minimize friction and enhance equipment performance. Further, the device is capable of precise measurement of both spread and span dimensions in rowing watercraft to optimize rigging.

A device includes a cleat and a receiver. The cleat is mountable to a shoe and includes a front portion and a rear footing. The receiver is mountable to a support of an external device. The receiver includes a frame including a front portion and a rear portion, with the rear portion configured to removably slidably receive the rear footing of the cleat. The front portion of the receiver includes a catch element, which is pivotally movable relative to the frame while under a rotational biasing force in a first orientation, to permit slidable entry of, and retention of, the front portion of the cleat relative to the frame of the receiver.

A device includes a cleat and a receiver. The cleat is mountable to a shoe and includes a front portion and a rear footing. The receiver is mountable to a support of an external device. The receiver includes a frame including a front portion and a rear portion, with the rear portion configured to removably slidably receive the rear footing of the cleat. The front portion of the receiver includes a catch element, which is pivotally movable relative to the frame while under a rotational biasing force in a first orientation, to permit slidable entry of, and retention of, the front portion of the cleat relative to the frame of the receiver.

Examples are disclosed that relate to watercraft with retractable drive mechanisms. One example provides a watercraft including a hull having a receiving compartment, and also having a deck. The watercraft also includes a drive unit extending through the deck and the hull of the watercraft and being configured to receive rotational input. The drive unit includes a driveshaft and propeller moveable between an extended position in which the propeller is positioned underneath the hull and a retracted position in which the propeller is positioned at least partially within the receiving compartment.

Examples are disclosed that relate to watercraft with retractable drive mechanisms. One example provides a watercraft including a hull having a receiving compartment, and also having a deck. The watercraft also includes a drive unit extending through the deck and the hull of the watercraft and being configured to receive rotational input. The drive unit includes a driveshaft and propeller moveable between an extended position in which the propeller is positioned underneath the hull and a retracted position in which the propeller is positioned at least partially within the receiving compartment.

A pedal installation structure of a boat includes a slide rail, a pull rod, a slider, and a pedal. The slide rail has a plurality of spaced tooth grooves thereon. The pedal is installed on the slider. The slider is slidably installed on the slide rail. The pull rod is installed between the slider and the slide rail. One end of the slider is provided with a rotatable pawl. A lower surface of the pawl is provided with a plurality of spaced teeth. It is convenient to use the pedal that has a simple structure.

A paddle board has two tracks integrally associated therewith for the further attachment of a slide within each track thereon. Thus, to effect motion of the slide associated with the track the Supski Paddle System has two actuation drives that are rotationally associated with the aforementioned slides one to each slide respectively. Upon user actuation of the drive using a pole associated with the drive the slide is directed to move longitudinally upon a track or to insert a paddle into and out of the water.

A paddle board has two tracks integrally associated therewith for the further attachment of a slide within each track thereon. Thus, to effect motion of the slide associated with the track the Supski Paddle System has two actuation drives that are rotationally associated with the aforementioned slides one to each slide respectively. Upon user actuation of the drive using a pole associated with the drive the slide is directed to move longitudinally upon a track or to insert a paddle into and out of the water.