Supercavitating water-entry projectile

Inactive Publication Date: 2001-02-06
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

In accordance with these and other objects, the invention is a supercavitating water entry projectile having aft mounted empennage which provides stabilization in both air and water and a supercavitating nose section. The projectile is a subcaliber, gun launched munitions using an appropriate sabot assembly to provide full caliber integrity. The projectile has circumferential grooves around its center section to match grooves in the sabot assembly. A key feature in the invent

Problems solved by technology

Current projectiles do not exhibit the capability to travel in both air and water and deli

Method used

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Embodiment Construction

Referring now to FIG. 1, the projectile 10 of the present invention is shown with its major sections depicted. The projectile has a cylindrical body comprising three major sections, the cylindrical aft section 12, the cylindrical center section 22, and the nose section 32. The steel aft section 12 is configured with suitable stabilizing empennage. This empennage is in the form of a plurality of fins 14. In the preferred embodiment, four equally spaced fins are circumferentially located around the aft section 12 and are sized to fit within the gun bore of a selected existing weapon. For aerodynamic stability, the center of gravity of the projectile 10 must be located forward of the center of pressure. The long body design of the projectile 10 with fins 14 as stabilizing empennage on the aft section 12 produces restoring force sufficient to provide good stability in both air and water. Gyroscopic-induced stability, such as used by spinning bullets in air, cannot be achieved because of...

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Abstract

A supercavitating water-entry projectile having empennage on the aft end which provides both aerodynamic and hydrodynamic stability and a supercavitating nose section is provided. A representative projectile is a subcaliber munition adapted for use in a 25 mm weapon using a sabot currently in use with the M919 round. The projectile has circumferential grooves around its center section to match these sabots. A key feature in the invention is the size and shape of the nose section. The projectile has a novel high strength extended blunt nose section followed by a truncated conical section which angles towards the body of the projectile in the range of five degrees. During underwater trajectory, the entire projectile is contained within the cavitation bubble formed by the blunt nose tip. The projectile's aft empennage, which provides both aerodynamic and hydrodynamic stability, fits within the bore of the weapon.

Description

FIELD OF THE INVENTIONThe invention described herein relates to underwater projectiles and in particular to long-rod projectiles used for destroying underwater objects such as obstacles, torpedoes, and mines.BACKGROUND OF THE INVENTIONDevelopment of penetrating projectiles as currently used in anti-armor applications has addressed numerous technological difficulties in order to produce effective weapons. The basic requirements of a long-rod penetrator includes the use of high density projectiles having a long length-to-diameter ratio and having very high impact velocities. The presently available projectiles are generally used for maximum target penetration of a hardened structure. The invention adapts long-rod penetrators with the capability of traveling both in air and water where the object is to achieve low-drag water penetration for the purpose of delivering high kinetic energy to underwater targets. This requires that the hydroballistic projectile maintain stability and low dr...

Claims

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Application Information

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IPC IPC(8): F42B15/00F42B10/46F42B15/08F42B15/22F42B10/00
CPCF42B15/08F42B10/46F42B15/22
Inventor HARKINS, THOMAS K.STEVES, HOWARD K.GOELLER, JACQUES E.
Owner THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
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