21-in Short A.W. Torpedo Tube (UK)
The 21-in Short Above-Water Tube was a single revolving tube used by the Beagle class destroyers.
It had a lip of 4 foot 10 inches, a liner of 6 feet 6 inches and a rear end of 8 feet 6 inches. The tripper was 6 feet, 6.5 inches from the rear door. A powder impulse was employed. It was like the 18-in light pattern tube, except it had a swing door. It weighed 3,140 pounds.
- Addenda (1911) to Torpedo Manual, Vol. III, 1909. p. 135.