HMS Illustrious (87) was the lead ship of her class of aircraft carriers built for the Royal Navy prior to World War II. She measured approximately 740 feet (225.6 meters) in overall length, with a waterline length of 710 feet (216.4 meters), a beam of 95 feet 9 inches (29.2 meters), and a deep load draught of 28 feet 10 inches (8.8 meters). Her displacement was around 23,000 long tons (23,369 metric tons) at standard load. The ship's propulsion system consisted of three Parsons geared steam turbines, producing up to 113,700 shp (84,800 kW), enabling her to reach speeds of about 30 knots (56 km/h). Her range was extensive, with a maximum of approximately 10,700 nautical miles (19,800 km) at 10 knots. Constructed by Vickers-Armstrongs at Barrow-in-Furness, Illustrious was launched on 5 April 1939 and commissioned on 16 April 1940. Her design featured a heavily armored flight deck—3 inches (76 mm) thick—and internal hangars with 4.5 inches (114 mm) thick sides and ends, providing significant protection for her aircraft and crew. She was the first aircraft carrier equipped with radar, specifically a Type 79Z early-warning system, installed before her completion. The ship's armament included sixteen 4.5-inch (110 mm) dual-purpose guns and multiple lighter anti-aircraft weapons, such as Oerlikon 20 mm autocannons and pom-poms, with armor protection designed for survivability in combat. Throughout her service, Illustrious played a pivotal role in key operations, notably the Battle of Taranto in 1940, where her aircraft sank an Italian battleship and damaged others. She suffered extensive damage from air attacks in early 1941, including bomb hits and a fire that destroyed aircraft and caused flooding, but her armored deck helped her survive against intense enemy assaults. She also participated in operations supporting the invasion of Madagascar, attacks on Italian and Japanese naval targets, and later served in the Pacific theater with the British Pacific Fleet, engaging in the Battle of Okinawa and other significant campaigns. Post-war, she was converted into a trials and training carrier, conducting deck-landing trials for British aircraft and ferrying troops and aircraft for various operations. Her design and operational history highlight her importance in both wartime naval aviation and post-war technological development, making her a notable vessel in Royal Navy history until her decommissioning in 1955 and subsequent scrapping in 1956.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.