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Submarine HMS L 27, the last but one of the boats ordered during the war, was commissioned for trials at Sheemess on Tuesday December 1st 1925.
Laid down in the Vickers yard at Barrow in January, 1918, she was eventually towed to Sheerness Dockyard to have her machinery installed, and was completed after nearly eight years of leisurely work.
The " L " class, of which she was a unit, was regarded as the finest group of patrol submarines in service under any flag. The L 27 displaced 890 tons on the surface and 1080 tons when submerged, her length overall being 238.5 ft. Motive power for surface cruising was provided by two sets of twelve-cylinder Vickers type - solid injection engines, developing 2400 brake horse-power for 17.5 knots. The armament consists of one 4in. gun and four torpedo tubes.