The Loch class was a class of anti-submarine (A/S) frigate built for the Royal Navy and her Allies during World War II. They were an innovative design based on the experience of three years of fighting in the Battle of the Atlantic and attendant technological advances. Some shipyards had trouble building these larger ships, which led to widespread use of the Castle-class corvette, introduced around the same time.
HMS Loch Alvie
Anything but graceful: showing crude finish & boxy shape designed for war production, here is HMS Loch Fada in 1944.
Loch Fada after 1953 modernisation
A frigate is a type of warship. In different eras, the roles and capabilities of ships classified as frigates have varied.
A sailing frigate of 1802. The French Penelope.
Baden-Württemberg, lead ship of her class of frigates of the German Navy, currently the biggest frigates worldwide.
Light frigate, circa 1675–1680
Boudeuse, of Louis Antoine de Bougainville