US Government As Represented by the Secretary of the Army

Yin Chen

Anthony Vella

Thomas Recchia

Mitchell Stolk

David Hosier

Ahmed Hassan

Sarah Hunt

Steven Gilbert

Pressure relief holes are sized and positioned on each fin of a projectile to allow high pressure from one side of the fin due to canard and fin interaction to bleed to a low pressure area on the opposite side of the fin. The location of the pressure relief holes target pressure differences due to canard roll control downwash while not affecting pressure differences due to projectile attitude. The fin planform area remains small enough to meet packaging and fire requirements for this type of munition and large enough to aerodynamically stabilize the airframe thereby enabling a more robust pitch and yaw autopilot design.

Pressure relief fins for improved roll control of precision projectiles

A low collateral damage, kinetic energy penetrator has multiple segments that are mechanically locked together by centrifugal force generated by penetrator spin. When the penetrator spin decreases below a minimum value, the segments separate and fall to the ground with non-lethal kinetic energy.

Low collateral damage kinetic energy projectile

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West Milford, NJ, United States of America

Yin Chen