A process and associated system for creating color effects using extrudable material, such as plastic and metal for example, are presented. Flows of first and second viscous materials of respective colors are provided and then combined in a predetermined pattern to form a stream of combined viscous material. A dynamic mixer is the then used to apply a predetermined dividing, overturning and combining motion to the stream of combined viscous material to partially mix the first viscous material and the second viscous material, such that upon exiting the dynamic mixer, the first material of the first color and the second material of the second color form a color pattern in the stream of combined viscous material. The dynamic mixer has elements configured for acquiring a specific radial orientation in a range of radial orientations that may be varied during the application of the dividing, overturning and combining motion to the stream of combined viscous material to cause variations in the color pattern in the stream of combined viscous material. Sheets of extruded material may be created using such process and system and used in the manufacturing of many different products including, but not limited to, kayaks, stand-up paddle boards, garden furniture and many others. In some embodiments, the sheets may be characterized by color bands extending diagonally with reference to a longitudinal extent of the sheet.

Techniques are disclosed to enable a system for controlling the propulsion and steering of a boat by a boat operator. The boat has at least one propulsion and steering motor assembly connected to the boat with a propeller, and a propulsion motor. It also has left and right pivoting pedals to provide a signal that controls the angle of the propeller so that if the left pedal is pivoted in a first pivot direction by a first percentage and the right pedal is pivoted in a second pivot direction by a second percentage, the boat executes a turn, moves forward, or moves in reverse.

Techniques are disclosed to enable a system for controlling the propulsion and steering of a boat by a boat operator. The boat has at least one propulsion and steering motor assembly connected to the boat with a propeller, and a propulsion motor. It also has left and right pivoting pedals to provide a signal that controls the angle of the propeller so that if the left pedal is pivoted in a first pivot direction by a first percentage and the right pedal is pivoted in a second pivot direction by a second percentage, the boat executes a turn, moves forward, or moves in reverse.

The present invention provides a tail rudder control system for a kayak which includes a tail rudder assembly, having a tail rudder, a swing mechanism for driving the tail rudder to rotate in the horizontal direction, a traction mechanism for driving the tail rudder to flip longitudinally for storage, and a guide wheel box for driving the swing mechanism and reset the tail rudder. Two pedal assemblies are in transmission connection with the swing mechanism through a steering traction line for driving the swing mechanism to act. A transmission assembly includes a first transmission wheel wound with a transmission traction line, a second transmission wheel wound with a reverse traction line. The second transmission wheel is driven by the first transmission wheel, and the reverse traction line is in transmission connection with the traction mechanism for driving the traction mechanism to act.

In one example, a method includes positioning, within a mold, a device with a movable element that defines a portion of a volume, and the volume is contained within the mold, as part of a molding process, at least partly defining a molded watercraft by introducing plastic into the mold, disposing the plastic about the movable element, and with the movable element, excluding the plastic from the portion of the volume that is defined by the movable element so as to define a recess and an undercut that are integral with the watercraft and extend lengthwise with respect to a centerline of the watercraft, and the recess and undercut are integral, and communicate, with each other.

A water sports board includes a board body, a seat back and a pair of pedals. The seat back is arranged on a top surface of the board body for a user's back to lean on. The pair of pedals arranged on the top surface of the board body for the user's feet to step on the pair of pedals.

A water sports board includes a board body, a seat back and a pair of pedals. The seat back is arranged on a top surface of the board body for a user's back to lean on. The pair of pedals arranged on the top surface of the board body for the user's feet to step on the pair of pedals.

A self-propelling watercraft system is provided. The watercraft has a base with a plurality of sidewalls extending from the base to form a cockpit. The base also has a recess, where a pump can detachably connect to the hull within the recess. The pump has an intake valve on a first end and a nozzle on a second end that is opposite the first end. The intake valve can intake water. The nozzle can jettison water received in the pump from the intake valve and agitate water surrounding the nozzle.

A self-propelling watercraft system is provided. The watercraft has a base with a plurality of sidewalls extending from the base to form a cockpit. The base also has a recess, where a pump can detachably connect to the hull within the recess. The pump has an intake valve on a first end and a nozzle on a second end that is opposite the first end. The intake valve can intake water. The nozzle can jettison water received in the pump from the intake valve and agitate water surrounding the nozzle.

The invention relates to an interface for mounting a propulsion mechanism to a watercraft such as a fishing kayak, and to a watercraft comprising such an interface. The interface comprises a first portion including a first plate with a hole sized and shaped for receiving therethrough a portion of the propulsion mechanism, a second portion including a second plate and one channel extending from the second plate, the channel being in registry with the hole of the first portion for therein a portion of the propulsion mechanism. The interface also comprises fastening assemblies for removably fastening the second portion to the first portion of the interface, and a guiding assembly for maintaining the channel of the second portion in registry with the hole of the first portion.