Alvand vs Type 21

Alvand

Iranian frigate, introduced in 1971, reaches a speed of 39 knots.
Origin	🇬🇧 United Kingdom
Category	Frigate
Type	Frigate
Manufacturer	Vosper Thornycroft
Year introduced	1971
Number built	4 units
Estimated unit price	NA

British frigate, 3,250 tons displacement, propelled by COGOG arrangement for a top speed of 37 knots.
Origin	🇬🇧 United Kingdom
Category	Frigate
Type	Frigate
Manufacturer	Yarrow Shipbuilders
Year introduced	1974
Number built	8 units
Estimated unit price	$60 million

Displacement	1,540 tons ◉
Maximum speed	39.0 knots ◉
Range	5,000 nm at 15 knots ◉
Length	94.5 m ◉
Beam	11.1 m ◉
Crew	146 ◉
Propulsion	2 Paxman Ventura cruising diesels 3,800 bhp (2,800 kW), and 2 Rolls-Royce Olympus TM2 boost gas turbines 46,000 shp (34,000 kW) on 2 shafts
Armament	4 × C-802 anti-ship missiles 1 × 4.5 in (114 mm) Mark 8 gun 1 × twin 35 mm (1.4 in) AA guns 2 × single 20 mm (0.79 in) guns 2 × 81 mm (3 in) mortars 2 × 0.50 cal machine guns 1 × Limbo ASW mortar 2 × triple 12.75 in (324 mm) torpedo tubes

Displacement	3,250 tons ◉
Maximum speed	37.0 knots ◉
Range	4,000 nm at 1200 knots ◉
Length	117.0 m ◉
Beam	12.7 m ◉
Crew	177 ◉
Propulsion	COGOG on 2 shafts; 2 × Tyne cruise turbines: 8,500 shp (6,300 kW); 2 × Olympus boost turbines: 50,000 shp (37,000 kW)
Armament	1 × 4.5 in (114 mm) Vickers Mark 8 gun 2 × 20 mm Oerlikon guns (later 4) 1 × 4-rail launcher for GWS-24 Sea Cat 2 × 8-barrelled Knebworth Corvus countermeasures launchers 4 × launchers for MM38 Exocet surface-surface missiles 2 × 12.75 in (324 mm) 3-tube STWS-1 anti-submarine torpedo launchers TKWA/MASS (Multi Ammunition Softkill System) 2 x 4-cell Harpoon missile launchers 1 x 6-cell LY-60N Hunting Eagle SAM launcher 1 × Vulcan Phalanx 20mm CIWS

Which has greater displacement, the Alvand-class or Type 21-class?

The Type 21-class has greater displacement at 3,250 tons compared to the Alvand-class's 1,540 tons.

Which is faster, the Alvand-class or Type 21-class?

The Alvand-class is faster with a maximum speed of 39 knots compared to the Type 21-class's 37 knots.

Which has longer range, the Alvand-class or Type 21-class?

The Alvand-class has a longer range at 5,000 nautical miles compared to the Type 21-class's 4,000 nautical miles.

Which is longer, the Alvand-class or Type 21-class?

The Type 21-class is longer at 117.0 meters compared to the Alvand-class's 94.5 meters.

How many crew members do the Alvand-class and Type 21-class have?

The Type 21-class has a larger crew complement of 177 compared to the Alvand-class's 146 crew members.

Which has been built in greater numbers, the Alvand-class or Type 21-class?

The Type 21-class has been built in greater numbers with 8 vessels compared to 4 vessels of the Alvand-class.