RAVEN - Canon Technology

[RicInOR]

Rarefaction Wave Gun.

The U.S. Army Wants to Put Big Guns on Small Tanks

Unlike recoilless guns, which lose velocity relative to conventional guns, Rarefaction Wave Gun—RAVEN—guns retain the same velocity and power as a conventional gun while reducing recoil forces, around 75 percent, with the way that it vents, allowing for cannons of the same power factor to be mounted on light vehicles. Barrel heating was reduced by 41 percent.

After ignition, but before the projectile has reached the end of the barrel, the combustion chamber opens and starts venting gas.

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[Jamie6.5]

Great, now I have a headache.
www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA504316

I'm gonna drop Joe a note.
He promised me the wasn't gonna be any math.