Abstract: A method of modifying operational characteristics of a swim fin makes existing fins adaptable to different users and/or operational needs. An existing swim fin having a blade portion extending from a body portion is placed on a flat work surface. The blade portion is made from a rubber-like material, and a template is laid on it. The outline of the template is traced onto the blade portion to define shape lines on it. The rubber-like material is removed from within the shape lines on the blade portion of the swim fin. The shape lines and the removed rubber-like material extend from a trailing edge of the blade portion toward the body portion. The method of the invention can readily modify and/or customize the fin's contours according to the user's needs or desires concerning fit, comfort, energy use, mission requirements and/or aesthetics.

Abstract: A system for calculating magnetic stray field data for current loop configurations. A graphical user interface utilizes multiple screens to define a current loop configuration, and prompt a user to select i) one of three orthogonal dipole directions in which the current loop configuration is aligned, ii) units of measure associated with the current loop configuration, and iii) one of a plurality of calculation scenarios. Calculation scenarios include i) current loop configuration defined by a single-size current loop, ii) current loop configuration defined by a non-uniform sized current loop, and current loop configuration defined as a single-size current loop and the user selects direction of simulated movement, start and stop positions along the movement direction and a step increment. A processor coupled to the graphipal user interface is programmed to perform magnetic stray field calculations for the selected calculation scenario. Calculations are displayed in graphical formats chosen by the user.

Abstract: An unmanned product dispensing system includes a standardized shipping container having at least one product module mounted therein, a controller module for controlling distribution of the products from the product module and monitoring status thereof, a communications module for communicating with the product module and transmitting the status to a remote location, and a dispenser for receiving and expelling the products so-distributed under the control of the controller module.

Abstract: A method and system are provided for estimating remaining absorptive capacity of a gas absorber. Inside the gas absorber, a reaction gas is produced by an exothermic or endothermic reaction. A plurality of temperature sensors include a first temperature sensor positioned at the gas absorber's inlet and subsequent temperature sensors spaced apart along the gas's flow path therethrough. Temperature differences between each subsequent temperature sensor and the first temperature sensor are determined. Each temperature difference is normalized using the largest one of the temperature differences so that corresponding normalized temperature differences are generated. The normalized temperatures differences are indicative of the remaining absorptive capacity of the gas absorber in accordance with a selected, experimentally-determined calibration function.

Abstract: A high-speed modular platform has an upper level section having gas turbines on it for propulsion, and a lower level section has a lower periphery having a flexible skirt system connected to it to create an air cushion. Hollow struts extend between the upper level section and the lower level section. Each hollow strut is securely connected to the lower level section and has an opening communicating with a skirt volume inside of the flexible skirt system. Each hollow strut slideably engages the upper level section to permit sliding motion of the upper level section on the hollow struts toward and away from the lower level section. A gas turbine is connected to each of the hollow struts to vent, or force pressurized gas through them and create an air cushion with the flexible skirt system to enable high-speed transit over water and land surfaces and provide buoyancy.

Abstract: A method and system are provided for measuring water current direction and magnitude. A plurality of beams of radiation are transmitted radially outward from a location above a body of water. Each beam is incident on the water's surface at an angle with respect thereto. Each beam experiences a Doppler shift as a result of being incident on the water's surface such that a plurality of Doppler shifts are generated. Each Doppler shift is measured with the largest one thereof being indicative of water current direction and magnitude.

Abstract: A sound mitigation system and method reduce the transmission of acoustic output from explosions underwater. The system is submerged to bottom terrain of a body of water and has at a series of gas-generating devices providing volumes of gas that are fed to refractory heat resistant tubing assemblies and flexible general tubing assemblies. The heat resistant and general tubing assemblies extend between adjacent gas generating devices and are provided with at least one row of holes to vent bubbles of gas and form a virtually continuous curtain of bubbles rising to the surface of the water between detonating explosives and areas of interest. The curtain of bubbles mitigates the effects of the explosions on marine mammals and endangered, threatened, or protected species within an area adjacent to the explosions.

Abstract: An apparatus and method permits unattended cleaning of a surface. A clamping mechanism engages features around a contaminated surface and is connected to a dome-shaped receptacle containing a gelled acid compound. The gelled acid compound is pressed and held against the contaminated surface during cleaning. Gelled acid ensures that the acid component for dissolving does not readily disburse into the ambient environment. Contamination exposed to the gelled acid compound is dissolved, and the clamping mechanism is disengaged for other cleaning tasks. More reliable attachment of instrumentation and other packages can be made to the cleaned surface. The uncomplicated apparatus and method of the invention allow a single diver to quietly attach packages underwater in the harsh marine environment.

Abstract: A system converts energy of waves into rotational energy, friction, heat, hydrodynamic lift, and drag to extract energy from waves to reduce their amplitudes and increase their periods to reduce destructive effects on shorelines. This also allows sand to move toward land while capturing and depositing land-ward sand and particulate matter from eroding away from the beach. A plurality of cylindrical-shaped turbines or hydro-foils are stacked in water to rotate in response to energy from waves to dissipate wave energy and renourish beaches and shorelines with sand and other particulate matter. Rounded bearing surfaces are in contact with one another for frictionally engaging one another, and a pair of elongate anchoring members embedded in the sea floor hold the turbines or hydro-foils above the sea floor in an aligned stacked relationship via end portions to assure their frictional engagement.

Abstract: An integrated water sensing actuator is based on a fibrous cellulosic material having anisotropic moisture-absorbing properties such that it's dried-in strain is greatest along one axis thereof. A plug of the dry and compressed fibrous cellulosic material has a powder material coated thereon and mixed therewith. The plug is compressed along it's axis of greatest dried-in strain and is fitted in a water-permeable housing adjacent a piston. The powder material is inert with respect to the cellulosic material and initiates a chemical reaction when exposed to water such that a product of the chemical reaction is water. Immersion of the housing in water causes expansion of the plug and corresponding movement of the piston.

Abstract: A hand-held tool for a diver has a hollow tube to vent pressurized gas from an interconnected source through an opening in the tube. The vented pressurized gas aerates material of a seabed, and an anchoring system disposed adjacent to the tube is effortlessly inserted in the aerated material by a single diver. The hand-held tool permits an improved method of inserting the anchoring system as compared to the time consuming, strenuous, and noisy hammering procedure that usually requires more than one diver to successfully embed an anchor in the seabed. Different sources of pressurized gas for aerating the material may include a portable gas cylinder, diver's air tank, or hose from a remote source, such as a compressor. Quick-change connectors can be used to quickly and easily connect and disconnect components to supply more gas or add different components that will help insert different anchoring systems.

Abstract: A method and system are provided for measuring water current. An acoustically-modulated beam of radiation is transmitted to a target location on the surface of a body of water. As the beam transits the water, acoustic radiation propagates away from the beam towards the surface and experiences a Doppler shift in frequency relative to the acoustic frequency used for modulation. The Doppler shift is caused by current in the water through which the acoustic radiation transits. The Doppler-shifted frequency is measured as an indication of water current.

Abstract: A method of fuze sterilization is provided for a fuze that includes a first component and a second component with a prescribed relationship being defined therebetween. The prescribed relationship is one that is required for proper detonation operation of the fuze. The first and second components are fabricated from materials having different galvanic potentials. An electrolyte is introduced between the first and second components to initiate galvanic corrosion of one of the components. The galvanic corrosion continues for a period of time until the prescribed relationship between the first and second components changes sufficiently to disable the detonation operation of the fuze.

Abstract: A method and system are provided for reducing sea state induced vertical motion of a shipboard crane's load. Sea state induced vertical velocity of the crane's suspended load is determined as a function of: i) the horizontal radial distance the load extends from the crane's axis of rotation, and ii) motion of the ship at the crane's axis of rotation. The load is then moved vertically at a speed that is defined as being equal to the vertical velocity in a direction that is opposite that of the vertical velocity.

Abstract: A flexible buoy assembly includes a flexible buoy having a passage formed therethrough. A flexible line passes through the passage and exits each end thereof. First and second bumpers are fixedly coupled to the flexible line about the circumference thereof. The first bumper is spaced apart from the first end of the passage and the second bumper is spaced apart from the second end of the passage.

Abstract: A towing rocket motor assembly has a tubular solid propellant grain defined by exterior surface area and interior surface area. The exterior surface area is inhibited from ignition within a tubular region of a housing. The housing includes a first end and a second end at either end of the tubular region. The first end defines a plenum having an annular region defined by a diameter larger than that of the tubular region. A plurality of holes formed in the first end communicate with the annular region and are directed substantially in the direction of the second end of the housing. A burn-inhibiting baffle is fitted in the propellant grain wherein an annular spacing is defined between the baffle and the interior surface area of the propellant grain. An ignition assembly, mounted at the second end of the housing, is coupled to the interior surface area of the propellant grain so that the propellant grain burns from the inside out upon ignition.

Abstract: A system and method for sensing magnetic anomalies uses a gradiometer having at least one pair of triaxial magnetometer-accelerometer (TMA) sensors. Each TMA sensor has X, Y, Z magnetic sensing axes and X, Y, Z acceleration sensing axes that are parallel to one another and to the X, Y, Z magnetic sensing and acceleration axes of all other TMA sensors. Each TMA sensor outputs components (Bx, By, Bz) of local magnetic fields and components (Ax, Ay, Az) of local gravitational acceleration fields. The components (Bx, By, Bz) and (Ax, Ay, Az) output from each TMA sensor are processed to generate motion-compensated components (Bcx, Bcy, Bcz) of local magnetic fields. A difference is generated between the motion-compensated components (Bcx, Bcy, Bcz) for each pair of TMA sensors thereby generating differential vector field components (&Dgr;Bx, &Dgr;By,&Dgr;Bz).

Abstract: The high frequency response of a versatile exercise mine system that emulates potentially threatening mines is extended by an acoustic float system. A watertight housing is buoyed upward from the mine system and has a first acoustic sensor to provide an omni-directional response to higher frequency acoustic signals in the range of 20 to 40 kHz that are transmitted from distant sources through ambient water. A second acoustic sensor adjacent to the first acoustic sensor produces a directional response to the higher frequency acoustic signals. Processing circuits receive signals from the acoustic sensors and generate signals representative of the higher frequency omni-directional and directional responses. An inclinometer generates signals representative of inclination of the acoustic system and a cable feeds the all the representative signals to a versatile exercise mine system for additional processing and/or evaluation.

Abstract: An underwater light includes a sealed housing defined by a rigid portion and a flexible portion. The rigid portion incorporates a light transmission window. A light source is mounted in the housing to direct its light through the housing's window. Also mounted in the housing are a power source and an open electrical circuit coupling the power source to the light source. The open electrical circuit includes spaced-apart terminals that prevent electrical power from being delivered to the light source. One of the terminals is coupled to the flexible portion of the housing and is aligned with another of terminals. Flexing of the housing's flexible portion into the housing causes the terminals to contact one another so that electrical power can be delivered to the light source. For depth compensation, a non-compressible dielectric fluid fills the housing.

Abstract: Munitions are dropped from military aircraft to quickly combat large area fires within vast threatened regions. Each munition has a shell-shaped case having a chamber containing an air-bag power module and fire retardant. A lid closes one end of the chamber, and switches on the case provide signals for the air-bag power module to suddenly forcefully displace the lid from the chamber by the air-bag module and suddenly forcefully eject the fire retardant from the chamber and out of the case by the air-bag module. Munitions containing fire retardant can be targeted accurately at single hot spots, isolated structures, and along fire lines or can be quickly and accurately dropped to create a protected zone behind an area that has been made not to burn by munitions to protect fire fighters trapped in the path of runaway fires. Munitions are deployed from aircraft by military crewmen without requiring additional training.