Type 21 Frigate - Amazon class
Eight built - HMS Amazon, Antelope, Ardent, Active, Ambuscade, Arrow, Alacrity, and Avenger. Designed to replace the Leopard and Salisbury Class Frigates. Initial cost were to be £3.5 million but HMS Amazon actually cost £14.4 million. Built by private Ship builders. Vosper Thornycroft, (HMS Amazon, Antelope and Active) with the other five by Yarrow's. Two of the class were lost during the Falklands War - HMS Antelope Sunk 24th May 1982 and HMS Ardent 22nd May 1982, The rest of the class were later sold to Pakistan.

Complement
10 Officers and 170 Ratings
a saving of almost a third of
equivalent vessels. As a result
improved living standards
.
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
Surface to Air missile  (1 x 4)  Seacat (GWS24) Range 5km; Speed Mach 0.9 4

Countermeasures  2 x Corvus chaff launchers
1 x Type 182 towed decoy

Refitted
SSM:
4 x MM38 Exocet GWS 50;(4 x 1) between 1984 - 1985. Range 45km; Speed Mach 0.93; 165kg warhead

Helecopter
1 x Westland Wasp
later replaced 1 x Westland Lynx HAS MK2
weapons:
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 182 Medium range active sonar
Type 162 Short range sonar

Other
1 x Cossor Type 191 IFF
SCOT satellite communications terminal
Computer: CAAS 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

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

Shafts 2