HMS Orion


This class of four ships began a new age in dreadnought construction. They are considerably larger, better protected and heavier armed than any ship preceding them in any navy, and they also were the first in the Royal Navy to drop the wing turret system. The five main battery turrets are all in the centre line, allowing for the elimination of one turret while maintaining a ten round broadside. All four ships entered fleet service in 1911 and 1912.

Ship data

Relative combat value: 12864

Basic damage control capacity: 59%


Displacement: 22200 tons

Length: 177 m

Width: 27 m

Draught: 9 m

Standard crew: 759


Maximum speed (undamaged): 21 knots

Endurance: 12471 km

Coal capacity: 4100 tons

Armour protection

Conning tower armour: 11

Hull armour: 8

Main belt armour: 14.5 (includes backing slope of deck armour)

Deck armour: 1.75 (sloped at edges to provide additional belt level protection)

Best armour type: Krupp


10 x 13.5in Mk V 1250 lb, centrally controlled. Ammo: 800 rounds

16 x 4in BL Mk VII, centrally controlled. Ammo: 2400 rounds

2 x 21in Mk II(M) Torpedoes, locally controlled. Ammo: 8 torpedoes

Ships in class

  • Orion
  • Monarch
  • Thunderer
  • Conqueror