Abstract: An improved sensor fish with robust design and enhanced measurement capabilities. This sensor fish contains sensors for acceleration, rotation, magnetic field intensity, pressure, and temperature. A low-power microcontroller collects data from the sensors and stores up to 5 minutes of data on a non-volatile flash memory. A rechargeable battery supplies power to the sensor fish. A recovery system helps locating sensor fish. The package, when ready for use is nearly neutrally buoyant and thus mimics the behavior of an actual fish.

Abstract: A method for making a degradable practice mine including the steps of covering a flat work surface with a polyethylene sheet to serve as a release film, weighing out the materials in a ratio of 10 parts sand to 1 part polyvinyl alcohol (PVA), mixing 1 part PVA with 10 parts sand making a sand/PVA mixture, filling a mold with the sand/PVA mixture, consolidating the sand/PVA mixture to make a consolidated form in the shape of a mine, and heating the consolidated form to make a hardened mine form mimicking the shape and launching characteristics of a tactical mine.

Abstract: A paint ball land mine capable of propelling standard caliber paint balls during simulated war games is disclosed. The present paint ball land mine is designed to simulate the function of a U.S. military Claymore anti-personnel mine for purpose of marking participants as out of the competition in the simulated war game. The paintball land mine includes a cylindrical discharge tube configured to receive a pyrotechnic charge in the form of a 12 gauge shotgun blank round and/or a .38 caliber blank round. In a preferred embodiment a firing pin is pivotally attached in operative relation to the pyrotechnic charge and spring-biased into contact therewith. A trigger mechanism including a trip pin fixedly attached to a trip wire is interposed between the pyrotechnic charge and the firing pin. When a participant comes into contact with the trigger mechanism the paintballs are propelled at a velocity up to 200 feet per second.

Abstract: The invention relates to an exercise mine system for training in mine detection. The invention including a passive oscillating circuit tuned to a certain frequency. This circuit being designed to be detected by another active oscillating circuit carried by an individual or vehicle.

Abstract: A visual indicator assembly for use with an underwater mine system comprises a surface position marker (11) having a buoyancy device (23), the marker (11) being adapted to provide visual and/or audible indications on the surface that a mine has been "fired". The assembly further comprises a support device (13) for supporting the marker (11) underwater and a severable coupling (37) which, when severed, releases the marker (11) to float to the surface. The assembly further comprises a release means selectively operable to sever the coupling (37) and to release the marker (11) to float to the surface.

Abstract: An exercise mine has a ballast portion, a generally barrel-shaped body constituted by a single piece molded about the ballast portion and a plurality of U-shaped metal fitting members having terminal portions that form resilient tabs which project outside the periphery of the body. The fitting members are secured together in groups to permit, along with the single molded body, the mine to be readily formed from just a few parts while ensuring the mechanical strength and durability of the mine.

Abstract: A weapon for use in a simulated war game which has the characteristics of a land mine and therefore does not require the user to be in proximity to a target when the weapon is activated. The weapon includes a housing having a first chamber adapted to contain a slurry of a marking agent and dispersing agent. A second chamber, communicating with the first chamber, is adapted to contain a propelling agent such as a cylinder of compressed gas for example. A trigger mechanism is operatively associated with an activator for the propelling agent to actuate the activator when the trigger mechanism is tripped. When the activator is actuated, the propellant is released into the first chamber to drive the slurry from such chamber through an opening into an exterior receptacle, which in turn directs the slurry in a desired pattern exteriorly of the housing.