Disclosed herein is a marine vessel, with a control panel movably mounted to the vessel.

An inflatable mast couplable to an underwater vehicle includes a flexible material defining an interior volume, a head structure, and a spring coupled to at least one of the flexible material and the head structure. The flexible material is designed to be filled with air to form an inflated mast structure that extends away from the underwater vehicle. The head structure is disposed at a distal end of the inflated mast structure and in some cases has a rigid shape that forms a panel having an outer surface that is flush with an outer surface of the underwater vehicle, when the mast structure is deflated and stowed. The spring is designed to provide a tensile force on at least one of the flexible material and the head structure when the flexible material is inflated to form the mast structure. A system includes the inflatable mast and a pump.

An inflatable mast couplable to an underwater vehicle includes a flexible material defining an interior volume, a head structure, and a spring coupled to at least one of the flexible material and the head structure. The flexible material is designed to be filled with air to form an inflated mast structure that extends away from the underwater vehicle. The head structure is disposed at a distal end of the inflated mast structure and in some cases has a rigid shape that forms a panel having an outer surface that is flush with an outer surface of the underwater vehicle, when the mast structure is deflated and stowed. The spring is designed to provide a tensile force on at least one of the flexible material and the head structure when the flexible material is inflated to form the mast structure. A system includes the inflatable mast and a pump.

A bar element as a construction element includes strips preferably produced from bamboo and is hollow at least in certain regions. The hollow interior is formed at least in certain sections as a hollow fillet achieved by a plastic and/or resin introduced into the bar elements, using a shaped body movable through the interior. Producing bar elements from interconnected strips ensures that although produced from a natural raw material, the bar elements have a reproducible outer cross section. Using a shaped body movable through the interior to produce the inner cross section also ensures a defined inner cross section of the bar elements, with the result that in turn connections between a plurality of bar elements that are defined by suitable connection elements can be formed. In this way, the bar elements make it possible to produce lattice works, grid constructions, frameworks or other desired structures and/or three-dimensional bodies.

One embodiment of a mast-head standing rigging connection device, allowing for sail module rotation about a mast axis, is disclosed. The embodiment allows for connection of shrouds and conventional single mast forestay and backstay rigging systems. Additional embodiments, utilizing modifications of the first embodiment, for multi-mast and triangular fore-aft sail mast roller reef-furl systems, are described.

One embodiment of a mast-head standing rigging connection device, allowing for sail module rotation about a mast axis, is disclosed. The embodiment allows for connection of shrouds and conventional single mast forestay and backstay rigging systems. Additional embodiments, utilizing modifications of the first embodiment, for multi-mast and triangular fore-aft sail mast roller reef-furl systems, are described.

A kayak sail system includes a sail including a first extending arm, a second extending arm, and a sail sheet supported between the first extending arm and the second extending arm. A deployment body for the sail includes a base plate supporting a first deployment arm and a second deployment arm. The first deployment arm is coupled to the first extending arm of the sail. The second deployment arm is coupled to the second extending arm of the sail. A support arm is spaced apart from the base plate. A first support post and a second support post extend from the support arm. A first extension spring extends from the first deployment arm and a second extension spring extends from the second deployment arm. The first extension spring is removably coupled to the first support post. The second extension spring is removably coupled to the second support post.

A watercraft incorporating a wind propulsion system, revealing a main mast and an auxiliary mast. According to the invention, provision is made for a length of the auxiliary mast between a flexible joint and the deck as well as an included angle from the main mast and deck capable of being locked in position on variable lines.

A watercraft incorporating a wind propulsion system, revealing a main mast and an auxiliary mast. According to the invention, provision is made for a length of the auxiliary mast between a flexible joint and the deck as well as an included angle from the main mast and deck capable of being locked in position on variable lines.

A mast righting assistance assembly includes a trailer hitch extension subassembly includes a trailer hitch extension insert and a trailer hitch extension receiver tube extending opposite directions, a winch subassembly carried by the trailer hitch extension subassembly, and a vertical column carried by the trailer hitch extension subassembly. A winch cable is routed from a winch drum through a cable redirecting component attached to a top of the vertical column. The cable is secured to rigging of the mast for controlling stepping and unstepping of the mast. The winch spools and unspools the cable to step and unstep the mast respectively. The vertical column is adjustable in height to obtain a desirable minimum force application angle respective to stowed mast.