This is based on the Vortex US Patent #5596161
from the US Patent Office website.
patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5596
161.WKU.&OS=PN/5596161&RS=PN/5596161"BRIEF DESCRIPTION OF THE INVENTION
The flash suppressor of the present invention takes advantage of the aerodynamics of the propellant gases and projectile in a rifled barrel. The rifling imparts a spin on the bullet perpendicular to the direction of motion. This spin stabilizes the projectile as it travels through the air. The spinning of the projectile also imparts a spin on the adjacent trailing propellant and the shock wave ahead of the projectile, so that the leading air and trailing gas is rotating in the direction of the rifling (generally clockwise) as it exits the barrel. By employing offset, helical flutes in the same orientation as the gas rotation in a barrel extension, the flash suppressor of the present invention facilitates the radial and forward outward flow of the air ahead of the projectile and the exiting trailing propellant. The flutes extend all the way to the distal end of the device, so no barrier is presented to the forward and outward motion of the expanding air and gas.
The rotational outward flow of the leading shock wave draws with it the air in the immediate vicinity of the muzzle, preventing oxygen from combining with the hot propellant gases immediately upon the propellant's exit from the muzzle. Directed outward expansion then cools the propellant and dissipates the unburned powder and also generates a vacuum to pull the remaining propellant behind the projectile outward away from the projectile. The dissipation and cooling of the propellant gas not only suppresses the burning necessary for a flash, but also decreases recoil by directing a portion of the exiting propellant gases radially from the barrel and reduces muzzle lift by neutralizing some of the reaction to the torque generated by the spinning bullet. Finally, most of the propellant is drawn away from the projectile as it exits the firearm barrel, so that it does not exert a force to cause the projectile to yaw.
Thus it is one object of this invention to provide an improved form of flash suppressor to more effectively eliminate the post-exit propellant combustion and resultant visible flash attendant to discharging a firearm.
It is a further object of this invention to dissipate some of the reactive gas forces that contribute to the firearm recoil and muzzle lift.
It is a further object of this invention to draw the high-velocity exiting propellant away from the projectile to lessen the propellant's drag and the propellant's tendency to cause projectile yaw, thus leaving the projectile with greater velocity and stability. "
To summarize-
The spinning shock wave ahead of the bullet moves forward and outward, drawing the air in the exit chamber with it. Propellant gas does not immediately ignite in the evacuated exit chamber due to a lack of oxygen, and then is expelled forward and outward through the flutes, cooling and dispersing the gas before it combines with enough oxygen to ignite. Drawing the gas outward also decreases friction on the spinning bullet, making the bullet's trajectory more stable, and decreases the reactive torque exerted by the spinning gas on the barrel.You can search the US Patent Office site either by patent # or by description.
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