Precision Home Defense Prototype Test
(threat body armor penetration)
Fired one 3957 FPS, 110 grain, .73 caliber projectile at type 3A armor protecting a human spine analog. The Kevlar® was attached to a one-gallon jug of ballistic gel. The bottle of gel contained a poplar dowel approximately 1 inch in diameter.
The following things happened:
The projectile did blow a hole through the Kevlar®, but the rapid energy propagation displaced the gel on the pressure wave, preventing projectile infiltration with the gel. Post test, we melted the gel and strained it through a screen. There was less than one grain of projectile material had infiltrated the gel. This is strong evidence supporting our belief that penetration can be reliably controlled and used.
The projectile struck the Kevlar® causing an entry hole approximately ¾ of an inch in diameter. The Kevlar® threads are frayed but not melted or ultrasonically fused.
The projectile produced a shaped pressure wave that created an exit hole in the Kevlar 1.5 inches in diameter while melting the Kevlar®. Kevlar® melts at 900 degrees farenheight. It is undetermined at this time if the Kevlar® fibers melted or were ultrasonically fused. Either phenomenon is unusual, but the fibers appear to be charred.
Note the crescent shaped flash of light on the upper right quadrant of the Kevlar® panel. There is a spherical pattern formed within the gel as the pressure wave propagates outward from the point of impact.
A pressure wave of at least 10,000 PSI reached the spinal analog inside several inches of 20% gelatin human analog causing the spine (Dowel) to rupture. The poplar dowel is commonly used as a human analog for a femur bone. Close examination confirmed that the projectile did not strike the dowel. The rupture was caused by a pressure wave passing through the ballistic gel.