18-in Light Pattern A.W. Torpedo Tube (UK)
The 18-in Light Pattern Above-Water Tube was a single revolving tube created in around 1909 and used by contemporary destroyers and scouts, such as the Cricket class T.B.s..[2]
It abolished the shield and carriage, had no training gear, allowing a light roller path to replace the racer. Its tube was in 2 rather than 3 sections (lengthwise), to eliminate one heavy flange. It employed a chopper door.[3]
A variant was used by Swift with the pivot three feet to the rear, to permit the torpedo to clear the gunwales on a ship with such ample beam. As this put the tube out of balance, the training gear had to be fitted on Swift.[4]
Its lip was 5 feet 6 inches long, and its rear part 13 feet long. The tripper was 5 feet, 8.625 inches from the rear door. A powder cartridge supplied the impulse.[5]
It weighed 2,184 pounds in initial installations, but Swift's weighed 2,390.[6]
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