ARMAMENT

Main gun 1 x Vickers Mk8 4.5"
GWS 24 SAM:4 x SeaCat anti Air (1 x 4)
Secondary guns 2 x 20mm Oerlikon cannon (2 x 1) two more added after the Falklands war
12.75" 3-tube STWS-1 torpedo tubes added 1980 refit
4 x MM38 Exocet (4 x 1) Anti ship weapon added 1984/85 refit

Vickers Mk8 4.5 gun
                   
Used for surface, air and shore bombardment targets the gun mounting itself is unmanned.  It is constructed of fiberglass.Up to sixteen ready rounds are carried vertically on an indexing feed ring.The weapon emphasised reliability over a high rate of fire, resulting in a lighter, single barrel mounting and ammunition of a one-piece design.
The gun system has a combination of electrical and hydraulic components and the full system penetrates up to three deck levels below the weather deck; deep magazine, gun control room and power room, gunbay and the gunhouse.
The weapon is semi-automatic, therefore needing fewer people than its predecessors to operate. With no personnel in the gunhouse loading is supported by personnel in the gunbay to load the feed ring, the deep-magazine to pass ammunition to the gunbay. The Captain of the Gun in the control room ensures continued operability and the gun controller in the Operations Room operates the aiming and firing process. The weapon has a rate of fire of about 25 rounds per minute and a range of 12 nm (22 km; 27.5 km with the newer High Explosive Extended Range round-46 pounds (21 kg) HE).

MM-38 Exocet

    

Exocet is a short-range, solid propellant, single warhead, ship-launched cruise missile developed and manufactured by France. It is powered by a solid propellant boost rocket weighing 100 kg, and a solid propellant sustainer motor weighing 151 kg. The MM-38 has a maximum range of 25 miles/40 km, and carries a high explosive fragmentation warhead weighing 165 kg.
After its launch, the MM-38 stabilizes in the direction of its target at its first cruising altitude, low enough to avoid detection by its target yet high enough to allow its active radar seeker head to acquire the target. Midcourse guidance is by an inertial navigation system (INS) and a radio altimeter, allowing the missile to fly a sea-skimming trajectory to its target. The MM-38 descends to its second cruise altitude for the terminal phase, with a final approach at an altitude determined by prevailing sea conditions, sometimes as low as 3 m. Terminal guidance is provided by an active radar.

GWS 24 Seacat Missiles

Sea Cat is a small, subsonic missile powered by a two-stage solid fuel rocket motor. It is steered in flight by four swept, cruciformly arranged wings and is stabilised by four small tail fins. It is guided by Command Line-Of-Sight (CLOS) via a radio-link; i.e. flight commands are transmitted to it from a remote operator with both the missile and target in sight.
Sea Cat used a 4-rail, manually-loaded, trainable launcher (mounted above the hanger) that incorporated the antennae for the radio command link. The GWS 24 variant on Type 21 frigates used the Italian Alenia Orion RTN-10x fire control system with Type 912 radar.

 

STWS1 (Shipborne Torpedo Weapon System )

The MK-46 torpedo was designed to attack high performance submarines, and was the NATO standard.
Range was 2000 yards, speed over 28 knots and depth greater than 1200 feet. Guidence homing mode Active or passive -snake or circle search. the warhead was 98 lbs of high explosive. The torpedo tubes were mounted aft on the boat deck

20mm Oerlikon
                    

The Oerlikon 20 mm cannon is a single-barrelled cannon with a large spring coil surrounding the barrel. Ammunition feed is by a 60-round drum magazine on the top of the gun. A trigger in the right-hand grip controls fire. Used cartridges are ejected from below the breech.it is free-swinging on a fixed pedestal mounting with a flat armored shield affording some protection for the crew. The cannon is aimed and fired by a gunner using, in its simplest form, a ring-and-bead sight. The gunner is attached to the weapon by a waist-belt and shoulder supports. Originally equiped with two mountings on the Fwd boat deck, two additional ones were added at the forward end of the flight deck. This weapon was used for close defence of the ship from aircraft and small craft.