HMS ALACRITY F174  

ALACRITY keeping the peace in quieter times

 
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TYPE 21 FRIGATES

A lot of rot has been written about these ships, based largely on the fact that two of the type were sunk during the conflict and the exaggerated weaknesses of the aluminium superstructure . Type 21s were popular with their ships' companies though considered 'lively' sea keepers by some. Without a doubt they looked sleek and warlike but with Lynx helicopter fitted for both anti-submarine and anti-surface roles, 4.5inch gun and Exocet they packed a considerable punch. As with most general purpose frigates their vulnerability was to fast-jet attack: the Seacat missile system with which most GP frigates were equipped 1982 belonged to another era and offered little threat to modern attacking jets. With four gas turbine engines the ships were fast, mobile and nimble. Compared with other ships of a similar displacement, the crew numbers were small.

ALACRITY was a proud member of the 4th Frigate Squadron (the 21 Club - a squadron of eight Type 21s). Seven of the eight were engaged in the conflict. Serving personnel would often be 'typed' and spend much of their sea-time within ships of the squadron and so a comrardery developed between the ships that was not to be found so readily elsewhere in the Royal Navy.

With minor differences in weapons and sensors the Type 21s were identical.

Details

Displacement 2,750 tonnes
Length 104.7 m
Beam 12.7 m
Propulsion

2 x Rolls-Royce Olympus gas turbines each producing 25,000shp

2 x Tyne gas turbines each producing 5,000shp

Range 4,000 miles at 17 kts; 1,200 miles at 30 kts

Weapons systems

Gun

Vickers 4.5 inch Mk8 with a range of 23km; 21kg shell with HE warhead of 2.53kg; ROF 25 rounds per min. Muzzle velocity 2,850 ft/sec

Surface to surface missile

4 x Exocet GWS 50; Range 45km; Speed Mach 0.93; 165kg warhead

Surface to air missile Seacat (GWS24) Range 5km; Speed Mach 0.9

Some ships were equiped with anti-submarine torpedo launchers

Electronics

Radars

Type 1006 I Band Navigation and Helo control

Type 992 E/F Band surveillance

Type 912 I Band Gunnery and Seacat tracking

Sonar

Type 182 Medium range active sonar

Type 162 short range sonar

Type 182 Torpedo decoy

Computers CAAS Ferranti FM1600B for both gun and Seacat
Communications

integrated Communications Systems 2

SCOT satellite communications terminal

VHF/UHF systems

Data

Link 10 (HF and VHF)

Link 14 (Receive)

 

Vickers mk8

Vickers Mk8 4.5 inch gun- the most reliable weapon of thenaval conflict ?

 

 

 

 

 

 

Helicopter

Lynx HAS Mk2 Propulsion 2 x Rolls-Royce Gem; Max speed 160 kt; max take-off weight 4,535 kg; crew of 2
Weapon systems

2 x Mk44 or Stingray AS torpedoes

2 Depth charges

4 Sea Skua Anti-ship missiles

Lynx HAS Mk2

Lynx helicopter - the most versatile of weapon systems