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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 differential thermal expansion caused by the temperature differences around the barrel when firing.
It had a distinctive barrel cooling shroud (containing a finned breech-to-muzzle aluminium heat sink to cool the gun barrel), and top-mounted pan magazine. The Lewis served until the end of the Korean War , and was widely used as an aircraft machine gun during both World Wars, almost always with the cooling shroud removed, as air flow during ...
The less expensive and more-easily manufactured "stick" magazines were used exclusively in the M1, with a new 30-round version joining the familiar 20-round type. The Cutts compensator, barrel cooling fins, and Blish lock were omitted while the buttstock was permanently affixed. Late production M1 stocks were fitted with reinforcing bolts and ...
The temperature of the cooling air may range from well below freezing to 50 °C. Further, while engines in long-haul boat or rail service may operate at a steady load, road vehicles often see widely varying and quickly varying load. Thus, the cooling system is designed to vary cooling so the engine is neither too hot nor too cold.
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Unusual for submachine guns, the m/948 was fitted with a barrel sleeve with a mount to accept the standard Portuguese Mauser bayonet. The original version of the submachine gun (the FBP m/948) only allowed for fully automatic fire. An upgraded version ( designated FBP m/963) introduced in 1961 also allowed for semi-automatic fire.
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During sustained fire, the barrel would heat up which heated the water in the jacket until hot enough for the water to evaporate or boil thereby cooling the barrel releasing the heat through steam. It took the Mk I 600 rounds of continuous fire to boil the water in the jacket, evaporating at a rate of 1.5 pints (0.852 L) per 1,000 rounds. [ 33 ]