Re: Water Cooled Vickers Guns....

> Where might it make sense to investigate
> modern fluid cooling systems, perhaps using
> water and microtubes or perhaps using
> something like liquid nitrogen?

Liquid nitrogen is a crygenic.	It would be complicated to keep get the
cooling cycle right to keep from damaging the barrel to by cooling it
down
too quickly.  The there is also problem with brittleness of a frozen
barrel.
It would really bite to drop your weapon and have the barrel break...

> 1) If we had a rugged enough system.
> Radiators tend not to be too rugged.

Screw threads are rugged radiators, and the Steyr AUG already has them. 
Now
if you combined screw threaded barrels on a gatling gun, you've got
radiators with forced air circulation.	A three, screw threaded,
barreled
gatling gun set for 50 round bursts could be just the ticket for PA
use...

ias