A thermal sleeve, or blanket, is a device around the length of a gun barrel of a large caliber gun, typically found on modern tanks. Its primary purpose is to provide a more consistent temperature to the gun barrel preventing distortions due to thermal expansion caused by the temperature differences around the barrel when firing.[1]
Thermal sleeves were originally simply insulators. They would prevent ambient conditions such as bright sunlight or winds from heating or cooling one side of a barrel more than the other which would cause a thermal distortion (bending or drooping), reducing accuracy. More modern variants contain concentric inner and outer insulating sleeves with a gap in between. Versions have been created which are detachable from a given barrel so that they can be re-used with a replacement barrel. Proposals exist for types that have advanced external thermal and radar profiles, reducing their thermal and radar signatures making the barrel and thereby the tank harder to detect.[2]
The canvas-covered thermal sleeve on a Chieftain tank
One of the earliest guns to use a thermal sleeve was the Royal Ordnance L11 used on the Chieftain tank.
^Tucker p. 360-361
^US Patent 5400691 Archived 2011-06-12 at the Wayback Machine, Rigid thermal sleeve for a gun barrel, Retrieved on 29 December 2008
A thermalsleeve, or blanket, is a device around the length of a gun barrel of a large caliber gun, typically found on modern tanks. Its primary purpose...
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