Marine vessel propulsor occlusion systems and devices made of novel fabrics formed from biodegradable and/or dissolvable materials, and methods of manufacturing and using the same are disclosed. The propulsor occlusion devices can slow and/or incapacitate a marine vessel without serious injury to occupants and without destroying the vessel's propulsion system.

A non-lethal naval vessel interdiction weapon is provided. The non-lethal naval vessel interdiction weapon includes a hydrodynamic hull, guidance and delivery systems housed in the hydrodynamic hull with the delivery system being controllable by the guidance system to drive a naval vessel impeding payload toward a target and a deployment system. The deployment system is configured to prepare the hydrodynamic hull for payload deployment and to deploy the naval vessel impeding payload toward the target following hull preparation.

A motorized, floating device is associated with another aquatic device that carries a passenger or passengers (associated aquatic device). The invention comprises components such as one or more magnetic field emitters that deter aquatic animals from approaching the associated aquatic device without interfering with the operation of the associated aquatic device. The associated aquatic device may be a surfboard, a raft, a personal watercraft, or other similar small craft that floats in water. The invention may be used with larger boats and other watercraft. The motorized aquatic animal deterrent is tethered to the associated aquatic device to follow movement of the associated aquatic device but is spaced apart from the associated aquatic device.

In one aspect, the present invention provides a security bulwark for mounting outside a perimeter railing of a vessel or marine installation. The bulwark has a front face comprising a projecting mound. The mound has an underside which provides the bulwark with an overhang. The mound is also convex in a direction of the breadth of the bulwark. The invention also provides a perimeter protection system comprising a plurality of such security bulwarks arranged side-by-side and adjacent to each other. Finally, the invention further provides a method of protecting a perimeter of a vessel or marine installation. The method comprises positioning a plurality of security bulwarks side-by-side and adjacent to each other along a perimeter railing of a vessel or marine installation, attaching some of the plurality of security bulwarks to the railing, and connecting remaining ones of the plurality of security bulwarks which are not attached to the railing to ones of the plurality of security bulwarks which are attached to the railing. Thus even if a security bulwark cannot be mounted directly to the perimeter railing, for example because of a gap in the railing or an obstruction in the way of the railing, the bulwark can still be positioned in the same location outside the railing and securely mounted in that location by being connected to an adjacent security bulwark which can be mounted to the perimeter railing.

In one aspect, the present invention provides a security bulwark for mounting outside a perimeter railing of a vessel or marine installation. The bulwark has a front face comprising a projecting mound. The mound has an underside which provides the bulwark with an overhang. The mound is also convex in a direction of the breadth of the bulwark. The invention also provides a perimeter protection system comprising a plurality of such security bulwarks arranged side-by-side and adjacent to each other. Finally, the invention further provides a method of protecting a perimeter of a vessel or marine installation. The method comprises positioning a plurality of security bulwarks side-by-side and adjacent to each other along a perimeter railing of a vessel or marine installation, attaching some of the plurality of security bulwarks to the railing, and connecting remaining ones of the plurality of security bulwarks which are not attached to the railing to ones of the plurality of security bulwarks which are attached to the railing. Thus even if a security bulwark cannot be mounted directly to the perimeter railing, for example because of a gap in the railing or an obstruction in the way of the railing, the bulwark can still be positioned in the same location outside the railing and securely mounted in that location by being connected to an adjacent security bulwark which can be mounted to the perimeter railing.

An immobilization device for steering systems on marine motors. The device comprises a first and second member, each member having two opposite ends, a non-immobilizing fastener connecting the first member near one of its ends to the second member near one of its ends, and a compressing fastener connecting the first member near the other of its ends to the second member near the other of its ends. The compressing fastener operates to draw the first and second members closer together. The device may also be part of an immobilization system comprising at least one of the devices and a steering system having a steering shaft and a steering ram. The device is assembled around the steering shaft and the compressing fastener is capable of applying sufficient compressive force to resist the steering ram sliding along the steering shaft.

An immobilization device for steering systems on marine motors. The device comprises a first and second member, each member having two opposite ends, a non-immobilizing fastener connecting the first member near one of its ends to the second member near one of its ends, and a compressing fastener connecting the first member near the other of its ends to the second member near the other of its ends. The compressing fastener operates to draw the first and second members closer together. The device may also be part of an immobilization system comprising at least one of the devices and a steering system having a steering shaft and a steering ram. The device is assembled around the steering shaft and the compressing fastener is capable of applying sufficient compressive force to resist the steering ram sliding along the steering shaft.

A security device comprising: a barrier; and a plate, wherein the barrier and plate are releasably attachable to each other, and when the barrier and plate are attached the device comprises a slot for receiving a rail and the device may hang on a rail with the rail received in the slot, and the barrier protrudes in a horizontal direction, perpendicular from a plane extending downwardly from the rail, to provide an overhang; and wherein at least a portion of the plate is made from a bullet-resistant material.

A security device comprising: a barrier; and a plate, wherein the barrier and plate are releasably attachable to each other, and when the barrier and plate are attached the device comprises a slot for receiving a rail and the device may hang on a rail with the rail received in the slot, and the barrier protrudes in a horizontal direction, perpendicular from a plane extending downwardly from the rail, to provide an overhang; and wherein at least a portion of the plate is made from a bullet-resistant material.

A naval azimuth propulsion system including an electric motor, a propeller operatively connected to the electric motor to rotate about a relative central axis, an annular nozzle positioned coaxially around the propeller, elements for supporting the motor and the propeller, these elements being connectable to the hull of a ship, first magnetic shielding means designed to shield the magnetic field generated by the electric motor during its operation.