Thermal sleeve

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A bolt-on thermal sleeve TankBarrelThermalSleeve.jpg
A bolt-on thermal sleeve

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]

Contents

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 Chieftain-MkIII-latrun-2.jpg
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.

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References

  1. Tucker p. 360-361
  2. US Patent 5400691 Archived 2011-06-12 at the Wayback Machine , Rigid thermal sleeve for a gun barrel, Retrieved on 29 December 2008

Bibliography