Re: tank barrel

From: Carey Sublette (careysub_at_earthling.net)
Date: 07/20/04 

To: sci-military-moderated@moderators.isc.org
Date: Tue, 20 Jul 2004 14:39:37 GMT

"Gerald Evenden" <gerald.evenden@verizon.net> wrote in message
news:392A9886-CC31-11D8-8FAB-000A958A3346@verizon.net...
> What is the object located approximately 1/3 to 1/2 from the mount to
> the
> muzzel of an Abrams M1A1 tank? It is about 1ft. long and increased the
> diameter of the barrel by about 4-6 inches. I believe that I have also
> seen
> a similar device on artillery pieces.
>
> I have not been able to find a name for the object nor a description of
> its function.
> _____________________________________
> Jerry and the low riders: Daisy Mae and Joshua

Sounds like a fume extractor.

This is an annular chamber surrounding the barrel, connected to the bore by
holes drilled through the barrel . When a shell is accelerated up the bore,
it compresses the air in front which of it, and fills the fume extractor
with compressed air. As soon as the shell leaves the gun, the pressure in
the bore drops to normal air pressure but the bore is left full of
combustion gases (unpleasant to breathe). The air in the fume extractor then
expands and helps blow the fumes out of the barrel. Otherwise when the
breech is opened to reload, noxious fumes get into the crew compartment.

Carey Sublette

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