HMS Colossus


The two ships of this class are essentially improved versions of the preceding HMS Neptune, with a stronger armour belt, improved internal subdivision and the elimination of the main mast, which increased stability and sea-going capability. To conserve weight, some compromises had to be made in terms of internal protection. They are the last class of capital ships to be fitted with a 12" main battery, but the first to bear the greater 21" torpedoes. Both ships were commissioned in 1911.

Ship data

Relative combat value: 9639

Basic damage control capacity: 66%


Displacement: 20225 tons

Length: 166 m

Width: 26 m

Draught: 9 m

Standard crew: 759


Maximum speed (undamaged): 21 knots

Endurance: 12378 km

Coal capacity: 3700 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 12 inch Mk XI, centrally controlled. Ammo: 1000 rounds

14 x 4in BL Mk VII, centrally controlled. Ammo: 2100 rounds

2 x 12-pdr 20cwt HA Mk Is, locally controlled. Ammo: 400 rounds

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

Ships in class

  • Colossus
  • Hercules