Built Portsmouth Dockyard, laid down November 1909, completed January 1912, cost £1,855,917.
Length 576 feet waterline 581 feet overall, beam 88 feet 6 inches, draught 27 feet 6 inches normal, displacement 20,797 tons light 27,120 tons deep.
4 shaft Parsons turbines, 27,000 shp, 21kts.
Orion 30,112 shp = 21.05 knots
12-8in belt, 10-3in barbettes, 11in turret faces, 4-1in decks
10 x 13.5in 45cal MK V (5 x 2), 16 x 4in (16 x 1), 4 x 3 pounder (4 x 1), 3 x 21in TT
The first of the so called "super Dreadnoughts". Huge improvement in main armament with an all centreline armament and the introduction of the powerful 13.5 inch gun. In expectation that foreign navies would also increase the firepower of future ships the armour was much improved both in terms of thickness and in the area covered. Crew 754.
World War 1 Service:
2nd Battle Squadron The Grand Fleet
Present at the The Battle of Jutland in 1916. Fired 51 13.5in rounds. Received no damage.
December 1922 sold for scrap.