Blackwood-class frigate

The Type 14 Blackwood class was a group of minimal, second-rate anti-submarine frigates built for the Royal Navy in the 1950s, when the Soviet submarine fleet was a growing threat. Twelve ships served with the Royal Navy and three more were built for the Indian Navy. The design was cheaper and smaller than the Type 12 frigates, at about 310 feet in length, and had no gun, but two Limbo mortars, Mk 20 torpedoes and a sonar fit gave it the same anti-submarine armament as the larger ship, and the ships were often the most effective frigates in anti-submarine exercises until the mid-1960s. They also did fishery protection duty during the confrontations with Iceland. The hulls had to be strengthened for those patrols, and HMS Exmouth was converted in 1966 to 1968 as a gas turbine trials ship, the first major Royal Navy warship powered entirely by gas turbines. Yarrow was involved in designing and building the class, and Navypedia lists three of the twelve as built at its Scotstoun yard. All were decommissioned in the 1970s.