The initial work ups for the battleship to follow the Colossus Class went to six 12-inch/50 twin gun turrets, all on centerline. It was obvious to the Admiralty that further development of the 12-inch gun had run its course. The loss of accuracy at long ranges and increased liner wear were steep prices to pay for increased range and penetrating power. The Admiralty had liked the 13.5-inch gun, last mounted in the old Revenge Class. It was decided to develop a new model 13.5-inch/45 gun, which to deceive the Germans was called the 12-inch/50 A. This decision was made after the Neptune was laid down and after the design of the Colossus Class but before they were laid down. The four capitol ships for the 1909-1910 Program would be Colossus, Hercules, a battleship and armored cruiser of new designs mounting 13.5-inch/45 guns, which would become Orion and Lion. The 13.5-inch/45 gun fired a shell which weighted 1250-ponds vs 850-pounds for the shell of the 12-inch/50 gun, plus it required a lighter charge. The advantages were obvious, longer range, greater penetration power, better accuracy, decreased liner wear and less powder needs. Another major decision was to finally mount all main gun turrets on centerline, although the turrets still unfortunately had the siting hoods at the front of the turret crowns, preventing end on fire. Sir Philip Watts prepared two designs mounting ten 13.5-inch guns, one with a maximum speed of 21-knots and another design with a maximum speed of 23-knots but costing 150,000 pounds sterling more. The Admiralty chose to save money with the 21-knot design. These decisions were made in the near hysteria caused rumors of an increased German building program. “We want eight and we won’t wait!” was the motto of the press and public who wanted to greatly expand the yearly battleship construction for the Royal Navy. Although the Prime Minister considered the four ships ordered for the 1909 Program more than sufficient, Parliament passed a Supplementary Construction Law that ordered an additional four ships to the capitol ship construction program. These would become the other three ships of the Orion Class, plus the battlecruiser, Princess Royal. When the press saw the jump in size and power, the Orion Class was called Superdreadnoughts.
To show how fast British battleship developing had become, the last 12-inch gun battleship, HMS Hercules, was laid down July 30, 1909 and the first 13.5-inch gun battleship, HMS Orion, was laid down four months later on November 29, 1909. The three sisterships to Orion in the Supplemental Program were laid down between April 1 and April 13, 1910. Orion was launched on August 20, 1910 and the other three between February 1 and May 1, 1911. Completion of the ships were in 1912, between January and November. There was a big jump in length and displacement from the Colossus Class and Orion Class but very little change in beam, due to the lack of dry docks of sufficient size. In comparison to the German Helgoland Class laid down in 1908, the Orion Class was five-feet narrower, constraining subdivision. Displacement was 22,200-tons load draught and 25,870-tons deep load. Length was 545-feet, with a beam of 88-feet 6-inches and draught of 28-feet 9- inches. Armament consisted of ten 13.5-inch/45 guns in twin turrets, sixteen 4-inch QF secondary guns, four 3pdr QF and three 21-inch submerged torpedo tubes with one mounted in the stern and two on the beam. The armored belt was 12-inches with an upper belt of 8-inches extending to the upper deck. Turrets and conning tower had 11-inches of armor with the barbettes receiving 10-inches. Armored decks were 4 to 1-inches. Three of the ships had 18 Babcock and Wilcox boilers with Monarch receiving Yarrow boilers. These fed steam to four Parsons turbines, developing 27,000hp for a maximum speed of 21-knots. The Orion Class perpetuated the unfortunate decision to mount the single tripod aft of the first funnel, making the control top very uncomfortable to unusable due to smoke and heat. This class was the last British battleship design to have that flaw. The trials of Orion showed that the design was subject to heavy rolling due to a higher meta centric height. The solution was to fit larger bilge keels.
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