Abstract:
A craft including a body having a front end, a rear end, two sides miming between said ends, and an axis running generally from the rear end to the front end; and a water displacement system operable to displace water to propel the craft across water and to displace water to cause the craft to rotate about said axis. The craft includes a ballast tank capable of being at least partially filled with ballast to change a position of a center of gravity of the craft to assist in rotation of the craft when capsized. The craft also includes a rapid filling and emptying system for a ballast system of a craft in addition to a water displacement system, wherein the rapid filling and emptying system includes at least one ballasting intake through which water is passed from the water displacement system into said ballast system; and at least one ballasting outlet through which the water displacement system draws water from the ballast system.
Abstract:
A device for righting a boat or other water vessel following a capsize. The device has an inflatable body which can be stowed in a collapsed state when uninflated. Compressed gas inflates the body following a capsize. The inflatable body has a flexible skin which forms at least first and second inflatable chambers. A valve arrangement causes the chambers to be inflated in a predetermined sequence. The first chamber securely mounts the valve upon the vessel. The second chamber is coupled to the first, supported by the first chamber when the device is deployed. Due to its buoyancy when submerged, the second chamber applies a righting moment to the vessel. The first chamber transmits this moment to the vessel. The staged inflation of the body alleviates its tendency to “pop up” to the surface before it is adequately inflated.
Abstract:
A fleet of autonomous sailing vessels that are equipped with monitoring and communication equipment for reporting environmental and other conditions. For optimal stability, the autonomous sailing vessels are multi-hulled vessels (catamarans) with self-righting capabilities. Each sailing vessel sends and receives information via one or more satellite links, using solar power to power the communications equipment as well as the monitoring equipment. Each sailing vessel includes an auto-sailtrim system to maintain a desired attack angle with the wind, and electric propulsion for use as required to maintain a desired heading. A modular design is used to support mission-specific payloads.
Abstract:
A kayak and canoe refloating device includes a flotation mat and at least two tethers configured for flexible attachment on one end to the flotation mat and on the other end to the side of the kayak and canoe. The flotation mat has a plurality of baffles and a length, width and depth when inflated sufficient to support a major portion of a water-filled kayak or a canoe when rolled into an upside down position onto the flotation mat for draining the kayak or canoe.
Abstract:
A multi-hull watercraft, such as a catamaran or trimaran is constructed to facilitate the righting thereof following a capsize. By providing a pivot connection between the hulls and the cross-members, in accordance with one method, it is possible to right the capsized vehicle by piecemeal rotation of the hulls through 180.degree. from an inverted to an upright disposition. Following this maneuver, the mast may be either rotated up and out of the water to an erect disposition or, alternatively, the mast can be jacked vertically through the deck. In accordance with a second method, the multiple hulls are interconnected by articulated, extendable and contractible cross-members and righting is achieved by sequentially reducing the beam of the craft, canting its buoyant mast from vertical so that the watercraft will roll so as to be floating on one hull and on the buoyant mast and then while canting the mast in the opposite direction again extending the cross-member to increase the beam such that a rotational moment about the one hull is created sufficient to raise the mast out of the water to an upright disposition.
Abstract:
For fabricating a double-hulled tanker, or a major component of one including at least part of longitudinal midbody, a floating drydock is used which has two independently elevatable-depressible sections. The midbody part is made of individual modules, each of which is fabricated in an upended orientation. The upended modules are successively floated onto a tilting assembly on one drydock section, tilted over and serially added to a growing midbody on the other drydock section. The two drydock sections are pumped out and flooded as the process progresses for shifting the positioning of the growing midbody and modules. Other parts, including a bow and stern are added, to provide a complete vessel.
Abstract:
This disclosure relates to an arrangement for returning a small boat from an overturned position to a normal upright position. The boat comprises a substantially enclosed room and a partition provided in the room adjacent the bottom of the craft to form in the room an upper compartment and a lower compartment under the upper compartment. The lower compartment is adapted to contain water, and the partition is adapted to substantially prevent the water from entering the upper compartment when the craft is overturned.
Abstract:
An elongated structural member is provided for releasable anchoring at one end to one end of either the fore or aft transverse bracing structure extending between and anchored relative to fore and aft portions, respectively, of the hulls of a catamaran. The elongated structural member is positionable in a plane normal to the longitudinal centerlines of the hulls and inclined generally 45.degree. relative to a plane containing the hull members with the other end of the structural member spaced outwardly from the underside of the remote hull. An elongated flexible tension member is attached at one end to the remote hull member, the mid-portion of the tension member is engaged with the other end of the structural member and the other free tension member end is free and includes handgrip means. When an associated catamaran needs to be righted, the free end of the tension member may be gripped by a person in the water and pulled downwardly upon by that person for the purpose of righting the catamaran, the structural member and tension member serving to establish a lever arm extending appreciably outwardly of the underside of the catamaran being righted and thereby enabling a downward force of less than 100 pounds on the tension member to be effective in righting a typical catamaran usually requiring the weight of a person weighing between 185 and 230 pounds utilizing a conventional righting strap or line passed over the upper hull of a catamaran to be righted.
Abstract:
A ballast apparatus for aiding in righting a capsized boat comprises a container for holding a quantity of water as ballast and includes a support for securing the container full of water to a person outwardly of the boat for exerting a righting moment thereon. The container is formed of flexible sheet material and is changeable between an opened condition for receiving and holding a quantity of water as ballast and a relatively flat collapsed condition for stowage while not in use on the boat.
Abstract:
A catamaran is provided which is equipped to permit facile re-righting thereof after capsizing. The catamaran includes floodable forecastles and buoyancy chambers, and a watertight cabin in the stern separated by bulkheads from the forecastles. Air inlets are provided for introducing compressed air into the buoyancy chambers to effect re-righting of the catamaran.