HMS Truculent was a British T Class patrol type submarine of 1090 tons displacement launched in 1942. HMS Truculent had a top speed of 15.25 knots surfaced and 9 knots submerged, carried a complement of 53 and was armed with one 4 inch dual-purpose gun; one 20 mm anti-aircraft gun; three machine-guns and about ten 21 inch torpedo tubes. Found on http://www.probertencyclopaedia.com/browse/RT.HTM