The Type 21 (Amazon Class) Frigate

The Type 21 frigate, or Amazon-class frigate, was a Royal Navy general-purpose escort that was designed in the late 1960s, built in the 1970s and served throughout the 1980s into the 1990s.



Except for Amazon all the Type 21 frigate class took part in the 1982 Falklands War as the 4th Frigate Squadron. They were heavily involved, performing extensive shore-bombardment missions and providing anti-submarine and anti-aircraft duties for the task force. On 10 May, HMS Alacrity and Arrow probed through Falkland Sound at night courageously searching for minefields that might have impeded landings and operations, almost as expendable hulls. Alacrity engaged and sank an Argentine naval supply vessel in the Sound. On exiting the Sound at daybreak, they were attacked by the ARN submarine San Luis, which fired two torpedoes; one hit HMS Arrows submarine towed decoy (as intended) and the other bounced off Arrows bottom, having failed to arm itself. Two vessels were lost: Ardent was hit by bombs dropped by Argentine aircraft on 21 May and was consumed by fire; Antelope was hit by bombs on 23 May, one of which was set off by the bomb disposal team attempting to defuse it on 24 May, causing the ship to catch fire, setting off her magazines resulting in her breaking her back and sinking.

Complement 10 Officers and 170 Ratings
Dimensions Displacement 2750 tonnes std
3250 tonnes max
Dimensions 384′ x 41′ 9″ (104.7m x 12.7m)
Draught 19′ 6″
Armament Gun Vickers 4.5 inch Mk8 with a range of 23km; 21kg shell with HE warhead of 2.53kg; Rate Of Fire 25 rounds per min. Muzzle velocity 2,850 ft/sec
Secondary guns 2 x 20mm Oerlikon (2 x 1)
Torpedo tubes STWS1 refitted STWS2
Surface to Air missile (1 x 4) Seacat (GWS24) Range 5km; Speed Mach 0.9 4
2 x Corvus chaff launchers
1 x Type 182 towed decoy
4 x MM38 Exocet GWS 50;(4 x 1) . Range 45km; Speed Mach 0.93; 165kg warhead
Helecopter 1 x Westland Wasp
later replaced 1 x Westland Lynx HAS MK2
2 MK44 or Stingray Anti Submarine torpedoes
2 Depth Charges
4 Sea Skua Anti Ship Missiles
Radar Type 1006 i band for Navigation and helicopter control
Type 992Q EF band for surveillance
2 x Type 912 fire control
(Gunnery & Seacat tracking)
Sonar Type 184 Medium range active sonar
Type 162 Short range sonar
Other 1 x Cossor Type 191 IFF
SCOT satellite communications terminal
Computer: CAAIS Ferranti FM1600B for both gun and Seacat

Machinery Engines COGOG
(Combined Gas or Gas)

2 x Rolls Royce Olympus gas turbines Power output 50000 shp
speed 30+ knots
range 1200 nautical miles @ 30 knots

2 x Rolls Royce RM1A Tyne gas turbines for extended cruising
Power output 8500 shp
Speed 18 knots

4000 nautical miles at 17 knots. 1200 nautical miles at 30 knots

Shafts 2