The present invention relates to a bullet with an increased effective range. The bullet includes a front end portion (10) having a hemispherical shape, a recess portion (20) connected to a rear end of the front end portion (10) and having a curved surface that is recessed inward, an inclined portion (30) connected to a rear end of the recess portion (20) and inclined at a predetermined angle (A) with respect to a horizontal line, a stepped portion (40) connected to a rear end of the inclined portion (30) and inclined at a predetermined angle (A) with respect to the horizontal line, and fluid inducing grooves formed from the rear to a rear end surface of the bullet (1). Thus, when the bullet passes through underwater, super cavitation may be more effectively generated and maintained for even longer to significantly increase the effective range of the bullet.

According to a first aspect of the present invention, there is provided a reconnaissance and communication assembly, adapted to be launched from a gun barrel into the air. The assembly comprises a carrier (with a cavity) and a payload (within the cavity). The payload is arranged to be controllably expelled from the carrier and once expelled from the carrier, the payload transmits a signal.

The present invention relates to a bullet with an increased effective range. The bullet includes a front end portion (10) having a hemispherical shape, a recess portion (20) connected to a rear end of the front end portion (10) and having a curved surface that is recessed inward, an inclined portion (30) connected to a rear end of the recess portion (20) and inclined at a predetermined angle (A) with respect to a horizontal line, a stepped portion (40) connected to a rear end of the inclined portion (30) and inclined at a predetermined angle (A) with respect to the horizontal line, and fluid inducing grooves formed from the rear to a rear end surface of the bullet (1). Thus, when the bullet passes through underwater, super cavitation may be more effectively generated and maintained for even longer to significantly increase the effective range of the bullet.

According to a first aspect of the present invention, there is provided a reconnaissance and communication assembly, adapted to be launched from a gun barrel into the air over a body of water. The assembly comprises a carrier (with a cavity) and a payload (within the cavity). The payload is arranged to be controllably expelled from the carrier and once expelled from the carrier, the payload is adapted to enter the water; and the payload transmits a signal after entering the water.

According to an aspect of the invention, there is provided an anti torpedo system, suitable for use on a ship, comprising operably linked; a combat management system comprising a high frequency hull mounted sonar, to determine the current positon and track (depth and underwater trajectory) of a torpedo, a plurality of (direct fire) munitions, each comprising an ogive portion terminating with a water drag reduction element, an energetic payload and a programmable fuze for initiating said payload, an auto-fuze setting system, for setting the time of initiation of the programmable fuze, and a gun management system for: receiving the current position and track of said torpedo from the combat management system, and aiming and firing of said munitions, based on the received position and track of the torpedo, such as to cause each fired munition to arrive at or proximate to said torpedo and to cause detonation of the payload.

According to an aspect of the invention, there is provided a system for reducing water-entry shock for a projectile entering the water, the system comprising: a first component, the first component being moveable to a target region for which water-entry shock is to be reduced, and arranged to interact with the water, for reducing water-entry shock for a second component; a second component in the form of the projectile, arranged to enter the water in the region for which water-entry shock has been reduced by the first component, functionality of the second projectile component being triggered by the water.

According to an aspect of the invention, there is provided a system for reducing water-entry shock for a projectile entering the water, the system comprising: a first component, the first component being moveable to a target region for which water-entry shock is to be reduced, and arranged to interact with the water, for reducing water-entry shock for a second component; a second component in the form of the projectile, arranged to enter the water in the region for which water-entry shock has been reduced by the first component, functionality of the second projectile component being triggered by the water.

According to a first aspect of the invention, there is provided a programmable system for a munition, comprising: an electroacoustic transducer, arranged to receive an acoustic signal comprising data, and convert that signal into an electrical signal comprising data; a processor, arranged to receive and process the electrical signal comprising data, and to use that data in programming of the programmable system.

Firearm ammunition, primarily for destroying underwater targets in the case of underwater or air-to-water fire also can be used to fire at targets in the air. A cavitating projectile of firearm ammunition comprises a secant nose surface with a cavitating edge of diameter (d), a head portion, a central portion and an aft portion with a gliding surface, maximum diameter of which is equal to a caliber projectile (D). In a plane of an axial longitudinal section of the projectile, the current diameter (D.sub.X) at a length (L.sub.X) from the cavitating edge (d) to the projectile caliber (D) is limited by the equation: D.sub.X=d[1+(L.sub.X/d)2sin /].sup.N, wherein N=0.25-0.40. The cavitating projectile results in an increase in target destruction efficiency due to the loss of stability and turning over in a heterogeneous target.

Firearm ammunition, primarily for destroying underwater targets in the case of underwater or air-to-water fire also can be used to fire at targets in the air. A cavitating projectile of firearm ammunition comprises a secant nose surface with a cavitating edge of diameter (d), a head portion, a central portion and an aft portion with a gliding surface, maximum diameter of which is equal to a caliber projectile (D). In a plane of an axial longitudinal section of the projectile, the current diameter (D.sub.X) at a length (L.sub.X) from the cavitating edge (d) to the projectile caliber (D) is limited by the equation: D.sub.X=d[1+(L.sub.X/d)2sin /].sup.N, wherein N=0.25-0.40. The cavitating projectile results in an increase in target destruction efficiency due to the loss of stability and turning over in a heterogeneous target.