Courageous-class aircraft carrier
The Courageous class, sometimes called the Glorious class, was the first multi-ship class of aircraft carriers to serve with the Royal Navy. The three ships—, and —were originally laid down as Courageous-class battlecruisers as part of the Baltic Project during the First World War. While very fast, their minimal armour and few guns limited their long-term utility in the post-war Royal Navy, and they were laid up after the war. They were considered capital ships by the terms of the 1922 Washington Naval Treaty and were included in the total amount of tonnage allowed to the Royal Navy. Rather than scrap them, the Navy decided to convert them to aircraft carriers as permitted under the Treaty. Furious, already partially converted during the war, began her reconstruction in 1921, before the Treaty came into effect. In an attempt to minimise air turbulence, she was given no superstructure or island. This was not entirely satisfactory, and a small island was added in 1939. Another problem was that she lacked a standard funnel; instead, her boiler uptakes ran along the sides of the ship and exhausted out of gratings on the rear of the flight deck, or at the sides of the ship