초록 ▼

An explosive device contains a water-reactive material that ignites upon exposure to water. The water-reactive material ignites a water-activated fuse that has a predetermined burn rate and length. The predetermined burn rate and length allows the device to sink to a desired depth before exploding.

An explosive device contains a water-reactive material that ignites upon exposure to water. The water-reactive material ignites a water-activated fuse that has a predetermined burn rate and length. The predetermined burn rate and length allows the device to sink to a desired depth before exploding. Hence, the device explodes after a desired period of time and/or at a desired depth. Defense against underwater swimmers is an advantageous feature of embodiments of the disclosure. The device can use a forty millimeter (40 mm) form factor, which permits launch of the device from convention grenade launchers.

대표청구항 ▼

1. An explosive device, comprising: a shell having a chamber; an opening extending from the chamber through the shell, the shell to house a high explosive;a water-activated fuse train having a burn rate which is a function of a sink rate of the device and an intended depth of detonation, the water-a

1. An explosive device, comprising: a shell having a chamber; an opening extending from the chamber through the shell, the shell to house a high explosive;a water-activated fuse train having a burn rate which is a function of a sink rate of the device and an intended depth of detonation, the water-activated fuse train having a first end and a second end, the first end and the second end being separated by a length of the water-activated fuse train;a detonation charge within the shell and coupled to the second end of the water-activated fuse train and in proximity to the high explosive; anda water-reactive material within the chamber, the water-reactive material to ignite the water-activated fuse train when exposed to water, the first end of the water-activated fuse train being connected to the water-reactive material, wherein the water-activated fuse train burns down to the detonation charge which is separate from the chamber. 2. The explosive device of claim 1, wherein the water-reactive material is one of sodium, strontium metal, lithium metal, phosphorous pentachloride, and potassium hydroxide. 3. The explosive device of claim 1, wherein the detonation charge is configured to detonate the high explosive within the shell. 4. The explosive device of claim 1, further comprising the high explosive, wherein the fuse train is disposed between the water-reactive material and the high explosive. 5. The explosive device of claim 4, wherein the length corresponds to the intended depth of detonation at which the high explosive will detonate when the water-activated fuse train burns down to the detonation charge. 6. The explosive device of claim 1, further comprising a high explosive within the shell. 7. The explosive device of claim 6, wherein the high explosive is one of TNT, Composition B, Pentaerythritol tetranitrate (PETN), HMX, and nitrocellulose. 8. The explosive device of claim 1, wherein the shell has a forty millimeter (40 mm) grenade form factor. 9. The explosive device of claim 8, further comprising a primer and a propelling charge within the shell. 10. The explosive device of claim 8, further comprising a removable cover to cover the opening in the shell, wherein the removable cover is a peel-off cover. 11. The explosive device of claim 1, wherein the opening is a continuous opening extending from within the chamber to outside of the shell. 12. The explosive device of claim 1, wherein the shell is otherwise water tight, but for the opening. 13. The explosive device of claim 1, wherein the chamber comprises a retaining plug configured to retain the water-reactive material in place. 14. The explosive device of claim 1, wherein the explosive device to produce concussive effects at the intended depth which would cause injury to a hostile underwater swimmer near a vessel without hazard to the vessel. 15. A system for defending a water-borne vehicle, comprising: a small arms launch device; andan explosive device configured to be launched from the small arms launch device, the explosive device including: an outer casing having a fuse ignition chamber within the outer casing;a port to allow ingress of water from outside of the outer casing to within the fuse ignition chamber;a detonator;a water-activated fuse train having a first end and a second end being separated by a length of the water-activated fuse train to ignite the detonator connected to the second end of the water-activated fuse train, the water-activated fuse train having a burn rate which is a function of a sink rate of the device and an intended depth of detonation of the detonator; anda water-reactive material within the fuse ignition chamber and connected to the first end of the water-activated fuse train, the water-reactive material to ignite the water-activated fuse train when exposed to water wherein the water-activated fuse train burns down to the detonator which is separate from the fuse ignition chamber. 16. The system of claim 15, further comprising a payload within the outer casing and configured to be detonated by the detonator, wherein the payload is an explosive. 17. The system of claim 15, wherein the small arms launch device is selected from the group consisting of an M203 grenade launcher, an M320 grenade launcher, an M79 launcher, an MK19, and an MK47 grenade launcher. 18. The system of claim 15, wherein the explosive device further comprising a removable cover to cover the port. 19. The explosive device of claim 15, wherein the explosive device to produce concussive effects at the intended depth which would cause injury to a hostile underwater swimmer near a vessel without hazard to the vessel.