Type 21 frigate

The Type 21 frigate, also called the Amazon class, was a general purpose escort of the British Royal Navy, designed in the late 1960s, built in the 1970s and in service into the 1990s. It was the Royal Navy's first privately designed warship for many years and the first of its ships to rely solely on gas turbines, with Rolls-Royce Tynes for cruising and Olympus engines for high speed. The design work and the building were given to the private yards of Vosper Thornycroft and Yarrow, and eight ships were built, the first of them, Amazon, entering service in May 1974. Yarrow built five of the eight at Scotstoun on the Clyde. The class fought in the Falklands War of 1982, and the six survivors were sold to Pakistan in 1993 and 1994, where two remain in service.