The Type 21 frigate, or Amazon-class frigate, was a British Royal Navy general-purpose escort that was designed in the late 1960s, built in the 1970s, and that served into the 1990s.
The Royal Navy frigate HMS Arrow underway (circa 1982)
HMS Amazon during Exercise RIMPAC 86
The Type 22 frigate also known as the Broadsword class was a class of frigates built for the British Royal Navy. Fourteen were built in total, with production divided into three batches.
Type 21 frigate
…with experience in building fully gas turbine powered ships and provide them with useful work for the shipyards while the Type 42-class destroyer and Type 22-class frigate would not be ready until the mid-to-late 1970s. As the Admiralty design board were busy with the latter, the Type 21 project was given to the…
Rademaker, formerly Battleaxe, a Type 22 frigate of the Brazilian Navy
HMS Campbeltown, displaying some of the external differences of the Batch 3 units; the 4.5-inch gun instead of Exocet launchers, and the Goalkeeper CIWS visible in front of the foremast.