Editing Courageous-class aircraft carrier

{{Short description|Multi-ship class of aircraft carrier}}
{{Featured article}}
{{Use dmy dates|date=February 2017}}
{{Use British English|date=February 2017}}
{|{{Infobox ship begin}}
{{Infobox ship image
|Ship image=Furious+half-sister.jpg
|Ship caption=Aerial view of ''Furious'' (right) and either ''Courageous'' or ''Glorious'' off [[Gibraltar]], early 1930s
}}
{{Infobox ship class overview
|Name=''Courageous'' class
|Builders=
|Operators={{navy|United Kingdom}}
|Class before={{HMS|Eagle|1918|6}}
|Class after={{HMS|Ark Royal|91|6}}
|Subclasses={{HMS|Furious|47|6}}
|Cost=
|Built range=1921–1929
|In service range=1925–1945
|Total ships completed=3
|Total ships lost=2
|Total ships scrapped=1
}}
{{Infobox ship characteristics
|Hide header=
|Header caption=(''Glorious'' and ''Courageous'' as converted)
|Ship type=[[Aircraft carrier]]
|Ship displacement=*{{convert|24210|LT|t|lk=on}} ([[Displacement (ship)#Normal displacement|normal]])
*{{convert|26990|LT|t|abbr=on}} ([[deep load]])
|Ship length=*{{convert|735|ft|1.5|in|m|1|abbr=on}} ([[Length between perpendiculars|p/p]])
*{{convert|786|ft|9|in|m|1|abbr=on}} ([[Length overall|o/a]])
|Ship beam={{convert|90|ft|6|in|m|1|abbr=on}} (at waterline)
|Ship draught={{convert|27.75|ft|m|1|abbr=on}}
|Ship power=*18 [[Yarrow boiler]]s
*{{convert|90000|shp|kW|lk=on|abbr=on}}
|Ship propulsion=4 shafts; 4 geared [[steam turbines]]
|Ship speed={{convert|30|kn|lk=in}}
|Ship range={{convert|6630|nmi|lk=in|abbr=on}} at {{convert|10|kn}}
|Ship complement=814 + 403 air group (1938)
|Ship armament=16 × single [[QF 4.7 inch Mk VIII naval gun|{{convert|4.7|in|abbr=on}}]] [[anti-aircraft gun|anti-aircraft (AA) guns]]
|Ship armour=*[[Belt armor|Belt]]: {{convert|2|-|3|in|mm|0|abbr=on}}
*[[Deck (ship)|Decks]]: {{convert|0.75|-|1|in|mm|0|abbr=on}}
*[[Bulkhead (partition)|Bulkhead]]: {{convert|2|-|3|in|mm|0|abbr=on}}
*[[Torpedo bulkhead]]s: {{convert|1|-|1.5|in|mm|0|abbr=on}}
|Ship aircraft=48
|Ship notes=
}}
{{Infobox ship characteristics
|Hide header=
|Header caption=(''Furious'' as converted)
|Ship displacement=*{{convert|22500|LT|t|lk=on}}
*{{convert|26500|LT|t}}
|Ship length=*{{convert|735|ft|2.25|in|m|1|abbr=on}} (p/p)
*{{convert|786|ft|9|in|m|1|abbr=on}} (o/a)
|Ship beam={{convert|88|ft|m|1|abbr=on}}
|Ship draught={{convert|27|ft|3|in|m|1|abbr=on}}
|Ship power=*{{convert|90000|shp|abbr=on|lk=on}}
*18 Yarrow boilers
|Ship propulsion=4 shafts, 4 geared steam turbines
|Ship speed={{convert|30|kn|lk=in}}
|Ship range= {{convert|7480|nmi|abbr=on|lk=in}} at {{convert|10|kn}}
|Ship complement=738 + 468 air group (1932)
|Ship armament=*10 × single [[BL 5.5 inch Mark I naval gun|{{convert|5.5|in|0|abbr=on}}]] guns
*6 × single [[QF 4 inch Mk V naval gun|{{convert|4|in|0|abbr=on}}]] AA guns
|Ship armour=*[[Belt armor|Belt]]: {{convert|2|-|3|in|mm|0|abbr=on}}
*[[Deck (ship)|Decks]]: {{convert|.75|-|1|in|mm|0|abbr=on}}
*[[Bulkhead (partition)|Bulkhead]]: {{convert|2|-|3|in|mm|0|abbr=on}}
*[[Torpedo bulkhead]]s: {{convert|1|-|1.5|in|mm|0|abbr=on}}
|Ship aircraft=36
|Ship notes=
}}
|}
The '''''Courageous'' class''', sometimes called the '''''Glorious'' class''', was the first multi-ship class of [[aircraft carrier]]s to serve with the [[Royal Navy]]. The three ships—{{HMS|Furious|47|2}}, {{HMS|Courageous|50|2}} and {{HMS|Glorious||2}}—were originally laid down as [[Courageous-class battlecruiser|''Courageous''-class battlecruiser]]s as part of the [[Baltic Project]] during the [[Naval warfare of World War I|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 [[Reserve Fleet (United Kingdom)|laid up]] after the war. They were considered [[capital ship]]s 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 [[ship breaking|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 [[Glossary of nautical terms (A-L)#island|island]]. This was not entirely satisfactory, and a small island was added in 1939. Another problem was that she lacked a standard [[funnel (ship)|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 if landing operations were in progress. The long ducts reduced her aircraft capacity, and the exhaust gases were as much of a problem for landing aircraft as the turbulence would have been. Her [[sister ship|half-sisters]], ''Courageous'' and ''Glorious'', began their conversions to aircraft carriers as ''Furious'' neared completion. They drew upon the experience gained by the Royal Navy since ''Furious'' had been designed and incorporated an island with a funnel, increasing their aircraft capacity by one-third and making it safer to land.

As the first large carrier completed by the Royal Navy, ''Furious'' was extensively used to evaluate aircraft handling and landing procedures, including the first-ever carrier night landing in 1926. ''Courageous'' became the first warship lost by the Royal Navy in the Second World War when she was [[torpedo]]ed in September 1939 by a German [[U-boat|submarine]]. ''Glorious'' participated in the [[Norwegian campaign]] in 1940, but she was sunk by two German [[battleship]]s in June as she sailed home with a minimal escort. ''Furious'' participated in many major operations during the war, including the Norwegian campaign in 1940, the [[Malta Convoys]] and ''[[Operation Torch]]'' in 1942, and airstrikes on the {{ship|German battleship|Tirpitz}} and other targets in Norway in 1944. The ship was worn out by 1944 and was placed in [[Reserve fleet|reserve]] status in September 1944 before being [[Ship commissioning#Ship decommissioning|paid off]] in 1945 and sold for [[ship breaking|scrap]] in 1948.

== Careers as battlecruisers ==
{{Main|Courageous-class battlecruiser}}

[[File:HMS Glorious (1917) profile drawing.png|thumb|left|''Glorious'' as a battlecruiser]]
The first two ships of the class, ''Courageous'' and ''Glorious'', spent the First World War on [[North Sea]] patrols, climaxing in the [[Second Battle of Heligoland Bight]] in November 1917. Their half-sister ''Furious'' was designed with a pair of {{convert|18|in|0|adj=on}} guns—as opposed to four {{convert|15|in|0|adj=on}}—but was modified while being built to hold a flying-off deck and [[hangar]] in lieu of her forward [[gun turret|turret]] and [[barbette]]. She made some patrols in the North Sea before her rear turret was removed and another flight deck added. Her aircraft attacked [[Zeppelin]] sheds during the [[Tondern raid]] in July 1918.<ref>Roberts, p. 123</ref>

All three ships were reduced to reserve after the war. The Washington Naval Treaty of 1922 limited the signatory nations to a set amount of capital ship tonnage; all ships in excess of this figure had to be scrapped. Up to {{convert|66000|LT|t|lk=on}} of existing ships could be converted into aircraft carriers, and the Royal Navy decided to use the ''Courageous''-class ships due to their high speed. Each ship was reconstructed with a flight deck during the 1920s.<ref>Friedman, p. 97</ref>

== Conversions ==
[[File:HMS Furious-2.jpg|thumb|left|''Furious'' as she was during the First World War with separate take-off and landing decks and superstructure in between]]
[[File:100 years of the RAF MOD 45163717.jpg|thumb|left|A [[Sopwith Pup]] unsuccessfully attempting to land on ''Furious''{{'}}s forward flight deck, 7 August 1917]]
{{HMS|Furious|47|2}} had been fitted during the First World War with a flying-off and landing deck, but the latter proved largely unusable because of the strong air currents around the superstructure and exhaust gases from the funnel. She was laid up after the war, but was converted to an aircraft carrier between June 1921 and September 1925. Her design was based on the very limited experience gained with the first two British carriers: {{HMS|Argus|I49|2}}, less than three years old, and {{HMS|Eagle|1918|2}}, which had carried out only 143 deck landings during preliminary [[sea trial]]s in 1920.<ref>Burt 2012, pp. 263–267</ref><ref>Burt 2012, p. 252</ref><ref>Brown, p. 252</ref>

''Furious''{{'}}s superstructure, masts, funnel and landing deck were removed and she was given a {{convert|576|by|92|ft|m|1|adj=on}} flight deck that extended over three-quarters of her length. This flight deck was not level; it sloped upwards about three-quarters of the way from the stern to help slow down landing aircraft, which had no brakes at the time it was designed. That era's fore-and-aft [[arresting gear]], initially {{convert|320|ft|1}} long on ''Furious'', was not intended to stop landing aircraft—the landing speeds of the time were low enough that this was unnecessary given a good headwind—but rather to prevent aircraft from veering off to one side and potentially falling off the flight deck. Various designs for the flight deck were tested in a wind tunnel by the [[National Physical Laboratory (United Kingdom)|National Physical Laboratory]] which showed that the distinctive elliptical shape and rounded edges minimised turbulence. To minimise any turbulence over the flight deck, ''Furious'' was flush-decked and lacked an island, like ''Argus''; instead she was provided with a retractable [[Glossary of nautical terms (A-L)#charthouse|charthouse]] at the forward end of the flight deck.<ref>Friedman, pp. 93–95</ref>

A two-[[storey]] hangar was built under the flight deck, each level being {{convert|15|ft|1|abbr=on}} high. The lower hangar was {{convert|550|ft|1|abbr=on}} long by {{convert|35|-|50|ft|1|abbr=on}} wide and the upper was {{convert|520|by|50|ft|1|abbr=on}}. Each hangar could be sectioned off by electrically operated steel shutters on rollers. Her boilers were ducted down the side of the ship to exhaust either out of gratings at the rear of the flight deck, or, when landing operations were in progress, out of the side of the lower hangar at the rear of the ship. This solution proved to be very unsatisfactory as it consumed valuable space, made parts of the lower hangar unbearable and interfered with landing operations to a greater or lesser degree. Her original flying-off deck remained in place for use by small aircraft like [[Fighter aircraft|fighters]] so that the ship could simultaneously land aircraft on the main flight deck while fighters were taking off on the lower deck and could speedily launch her aircraft from both decks. Doors at the forward end of the upper hangar opened onto the lower flying deck.<ref>Burt 2012, pp. 264–265</ref> Two {{convert|47|by|46|ft|m|adj=on|1}} lifts (elevators) were installed to transfer aircraft between the flight deck and hangars. Two {{convert|600|impgal|l USgal|adj=on}} ready-use [[petrol]] tanks were provided for aircraft and the ship's boats on the upper deck. An additional {{convert|20000|impgal|l USgal}} of petrol were in bulk storage. The longitudinal arresting gear proved unpopular in service and it was ordered removed in 1927 after tests aboard ''Furious'' in 1926 had shown that deck-edge palisades were effective in reducing cross-deck gusts that could blow aircraft over the side.<ref>Friedman, pp. 94–95</ref> ''Furious''{{'}}s long exhaust ducting hampered landing operations, and restricted the size of the hangars and thus the number of aircraft that she could carry.<ref name="Friedmanpp">Friedman, pp. 103, 105–106</ref>

''Glorious'' and ''Courageous'' were converted to aircraft carriers after ''Furious'' began her reconstruction, ''Courageous'' at [[HMNB Devonport|Devonport]] starting on 29 June 1924, and ''Glorious'' at [[Rosyth]] on 14 February 1924. The latter was moved to Devonport to complete the conversion after ''Furious'' was finished. Their design was based on ''Furious'' with a few improvements based on experience gained since she was designed. All superstructure, guns, and fittings down to the main deck were removed. A two-storey hangar, each level {{convert|16|ft|1|abbr=on}} high and {{convert|550|ft|m|1|abbr=on}} long, was built on top of the remaining hull; the upper hangar level opened onto a short flying-off deck, below and forward of the main flight deck. Two slightly larger {{convert|46|by|48|ft|m|adj=on|1}} lifts were installed fore and aft in the flight deck. An island was added on the starboard side with the bridge, flying control station, and funnel, as an island did not create as much turbulence as had been earlier feared. By 1939 both ships could carry {{convert|34500|impgal|l USgal}} of petrol.<ref name="Friedmanpp" />

== Description ==
[[File:HMS Glorious underway 1936.jpg|thumb|right|Aerial view of ''Glorious'', 1936]]
The ''Courageous''-class ships had an [[length overall|overall length]] of {{convert|786|ft|9|in|m|1|abbr=on}}, a [[beam (nautical)|beam]] of {{convert|90|ft|6|in|m|1|abbr=on}}, and a [[draft (ship)|draught]] of {{convert|28|ft|m|1|abbr=on}} at [[deep load]]. These were increases of {{convert|9|ft|6|in|m|1|abbr=on}} in beam and over {{convert|2|ft|m|1|abbr=on}} in draught compared to their earlier incarnations as battlecruisers. They displaced {{convert|24210|LT|t|lk=on}} at normal load and {{convert|26990|LT|t|abbr=on}} at deep load, increases of over {{convert|3000|LT|t}}. Their [[metacentric height]] declined from {{convert|6|ft|1|abbr=on}} at deep load to {{convert|4.4|ft|1|abbr=on}} and the ships had a complete [[double bottom]].<ref name=r65>Roberts, pp. 64–65</ref> In 1939, ''Courageous'' had a complement of 807 officers and [[naval rating|ratings]], plus 403 men in her air group.<ref>Burt 2012, pp. 283, 285</ref>

Their half-sister ''Furious'' was the same length, but had a beam of {{convert|89|ft|0.75|in|m|1|abbr=on}},<ref>Jenkins, front [[endpaper]]</ref> and an average draught of {{convert|27|ft|3|in|m|1|abbr=on}} at deep load, two feet deeper than before the conversion. She displaced {{convert|22500|LT|t}} at normal load and {{convert|26500|LT|t|abbr=on}} at deep load, over 3,000 long tons more than her previous displacement of {{convert|19513|LT|t}} at load and {{convert|22890|LT|t}} at deep load. ''Furious''{{'}}s metacentric height was {{convert|3.6|ft|1|abbr=on}} at deep load, a reduction of {{convert|1.48|ft|1|abbr=on}} after her conversion.<ref name=r65 /> In 1932, ''Furious'' had a complement of 738 officers and ratings, plus 468 men in her air group.<ref>Burt 2012, pp. 266, 273</ref>

=== Propulsion ===
The ''Courageous''-class ships were the first large warships in the Royal Navy to have geared [[steam turbine]]s. Arranged in two engine rooms, each of the turbines drove one of the four [[propeller shaft]]s. ''Furious''{{'}}s propellers were {{convert|11|ft|6|in|m|1|abbr=on}} in diameter. The turbines were powered by 18 [[Yarrow Shipbuilders|Yarrow]] small-tube boilers equally divided among three boiler rooms. The turbines were designed to produce a total of {{convert|90000|shp|lk=on}} at a working pressure of {{convert|235|psi|kPa kg/cm2|0|abbr=on|lk=on}}.<ref>Roberts, pp. 71, 76</ref> No significant changes to the machinery were made during the conversion process to any of the three ships, but their increased displacement reduced their speed to approximately {{convert|30|kn|lk=in}}.<ref name=f5>Friedman, p. 95</ref>

''Furious''{{'}}s fuel capacity was increased by {{convert|700|LT|t}} during her reconstruction, which increased her range to {{convert|7480|nmi|lk=in}} at a speed of {{convert|10|kn}}.<ref name=f3 /> The maximum fuel capacity of ''Courageous'' and ''Glorious'' was increased during the conversion to {{convert|3800|LT|t}} of [[fuel oil]],<ref name=b83>Burt 2012, p. 283</ref> giving them an endurance of {{convert|6630|nmi|abbr=on}} at 10 kn.<ref name=f3>Friedman, p. 363</ref>

=== Armament ===
[[File:British gun, skansin (Faroe Islands).jpg|thumb|left|300px|One of the 5.5-inch guns from ''Furious'', redeployed in the Faeroes]]
''Furious'' retained ten of her original eleven [[breech-loading]] [[BL 5.5 inch Mark I naval gun|BL 5.5-inch Mk I]] guns, five on each side, for self-defence from enemy warships.<ref name=b69 /> They fired {{convert|82|lb|kg|adj=on}} projectiles at a [[muzzle velocity]] of {{convert|2790|ft/s|m/s|abbr=on}}. Their maximum range was {{convert|16000|yd|m}} at their maximum elevation of 25°, and the rate of fire was 12 rounds per minute.<ref>Campbell, p. 40</ref>

Half a dozen [[QF 4 inch Mk V naval gun|QF 4-inch Mark V]] guns replaced her original [[Anti-aircraft warfare|anti-aircraft]] guns. Four were mounted on the sides of the flying-off deck and two on the [[quarterdeck]].<ref>Burt 2012, p. 267</ref> They had a maximum depression of −5° and a maximum elevation of 80°. The guns fired a {{convert|31|lb|kg|adj=on}} [[Explosive material#High explosives|high explosive]] (HE) shell at a muzzle velocity of {{convert|2387|ft/s|m/s|abbr=on}} at a rate of 10 to 15 rounds per minute. The guns had a maximum ceiling of {{convert|31000|ft|m|abbr=on}}, but an effective range of much less.<ref>Campbell, p. 58</ref> The four guns on the flying-off deck were removed during trials of the lower flight deck in 1926–1927, but only two were replaced when the trials were concluded.<ref name=f9>Friedman, p. 109</ref>

Four single [[QF 2 pounder naval gun|QF 2-pounder ''pom-poms'']] were installed by 1927.<ref name=f9 /> During ''Furious''{{'}}s September 1930 – February 1932 refit, her anti-aircraft outfit was changed by the substitution of two 8-barrel 2-pounder ''pom-pom'' mounts for the forward 4-inch guns on the flying-off deck removed earlier.<ref name=b69>Burt 2012, p. 276</ref> The Mark V mount could depress to −10° and elevate to a maximum of 80°. The Mark VIII 2-pounder gun fired a {{convert|40|mm|adj=on|order=flip}} {{convert|0.91|lb|kg|adj=on}} shell at a muzzle velocity of {{convert|1920|ft/s|m/s|abbr=on}} to a distance of {{convert|3800|yd|m}}. The gun's rate of fire was approximately 96–98 rounds per minute.<ref>Campbell, pp. 71–74</ref>

The {{convert|5.5|in|adj=on}} and {{convert|4|in|adj=on|0}} guns were replaced during ''Furious''{{'}}s refit in early 1939 by a dozen [[QF 4 inch Mk XVI naval gun|QF 4-inch Mk XVI guns]] in twin [[dual purpose gun|dual-purpose]] Mark XIX mounts. One mount each was on the former flying-off deck and the quarterdeck while the other four were mounted two per side.<ref>Burt 2012, pp. 268–269, 276</ref> The Mark XIX mount could depress to −10° and elevate to a maximum of 80°. The Mark XVI gun fired  fifteen to twenty {{convert|35|lb|kg|adj=on}} HE shells per minute at a muzzle velocity of {{convert|2660|ft/s|m/s|abbr=on}}. Against surface targets it had a range of {{convert|19850|yd|m|abbr=on}} and a maximum ceiling of {{convert|31000|ft|m|abbr=on}}, but an effective anti-aircraft range of much less.<ref>Campbell, p. 56</ref> Two more Mark V 2-pounder mounts were added fore and aft of the newly added island at the same time.<ref name=b69 />

During the Second World War, ''Furious'', the only surviving ship of the three, received an eventual total of 22 manually operated automatic [[Oerlikon 20 mm cannon|20&nbsp;mm Oerlikon]] light anti-aircraft (AA) guns, which replaced the single quadruple Vickers 0.50-calibre machine gun mount.<ref name=f9 /> The Oerlikon fired a {{convert|0.272|lb|adj=on}} HE shell at a muzzle velocity of {{convert|2750|ft/s|m/s|abbr=on}}. The maximum ceiling was 10,000&nbsp;ft and the maximum range was {{convert|4800|yd|abbr=on}} although the effective range was under {{convert|1000|yd|abbr=on}}. The cyclic rate of fire was 450 rounds per minute, but the practical rate was between 250 and 320 rounds per minute owing to the need to reload [[magazine (firearms)|magazines]].<ref>Campbell, pp. 75–76</ref>

A mix of single-purpose anti-surface and anti-aircraft guns in various sizes was considered for ''Courageous'' and ''Glorious'' by the [[British Admiralty|Admiralty]], but was ultimately rejected for a dual-purpose armament of sixteen [[QF 4.7 inch Mk VIII naval gun|QF 4.7-inch Mark VIII]] guns in single high-angle mounts. One mount was on each side of the lower flight deck and a pair were on the quarterdeck. The remaining twelve mounts were distributed along the sides of each ship.<ref name=b83 /> These mounts could depress to −5° and elevate to a maximum of 90°. The Mark VIII guns fired a {{convert|50|lb|kg|adj=on}} HE shell at a muzzle velocity of {{convert|2457|ft/s|m/s|abbr=on}} at a rate of 8–12 rounds per minute. The guns had a maximum ceiling of {{convert|32000|ft|m|abbr=on}}, but an effective range of much less. They had a maximum range of {{convert|16160|yd|m|abbr=on}} against surface targets.<ref>Campbell, p. 51</ref>

During refits in the mid-1930s, both ships received multiple 2-pounder ''pom-pom'' mounts. ''Courageous'' received three quadruple Mark VII mounts, one on each side of the flying-off deck, forward of the 4.7-inch guns, and one behind the island on the flight deck (two of these were transferred from the battleship {{HMS|Royal Sovereign|05|2}}). ''Glorious'' received three octuple Mark VI mounts in the same locations. Both ships received four water-cooled [[Vickers .50 machine gun|0.50-calibre Mark III]] [[machine gun]]s in a single quadruple mounting.<ref>Burt 2012, pp. 157, 286</ref> This mount could depress to −10° and elevate to a maximum of 70°. The machine guns fired a {{convert|1.326|oz|adj=on}} bullet at a muzzle velocity of {{convert|2520|ft/s|m/s|abbr=on}}. This gave the gun a maximum range of about {{convert|5000|yd|m|abbr=on}}, although its effective range was only {{convert|800|yd|m|abbr=on}}.<ref>Campbell, p. 78</ref> Neither ship had any further guns added before they were sunk early in the war,<ref name=f9 /> in 1939 and 1940, respectively.

=== Fire control and radar ===
To assist its weapon systems in hitting their target, ''Furious'' was completed with one [[fire-control system]] for each side, with separate [[Fire-control system#Naval fire control|directors]] for low-angle and high-angle guns. The 5.5-inch guns were centrally controlled by a [[Frederic Charles Dreyer#Dreyer Fire Control Table|Dreyer Fire-Control Table]] on the lower deck while the 4-inch guns had their mechanical computers next to their directors.<ref name=f5 /> The existing fire-control directors were removed when ''Furious'' received her new dual-purpose 4-inch mountings in 1939. New high-angle directors, including two for the ''pom-poms'', were mounted on top of the new island and on the former lower flight deck. Over the course of the war [[Type 285 radar|Type 285]] gunnery [[radar]]s were mounted on top of the high-angle directors. She also received a [[List of World War II British naval radar#Type 290|Type 290]] air-search radar.<ref name=f9 />

''Courageous'' was initially fitted only with low-angle directors for her guns, but these were replaced by dual-purpose directors when she was refitted in 1930. (''Glorious'', completed later, had hers from the beginning.) Neither ship was fitted with radar before its early loss.<ref>Burt 2012, pp. 285–286</ref>

=== Protection ===
Little armour other than that of the [[barbette]]s was removed during their conversion to aircraft carriers. The transverse bulkheads were carried through the locations of the former barbettes. The flight deck was {{convert|0.625|in|mm}} in thickness.<ref>Burt 2012, pp. 273, 282</ref>

Unlike other British battlecruisers, the bulk of the armour of the ''Courageous''-class ships was made from [[Ultimate tensile strength|high-tensile]] steel (HTS), a type of steel used structurally in other ships. Their waterline [[Belt armor|belt]] consisted of {{convert|2|in|0}} of HTS covered by a {{convert|1|in|0|adj=on}} thick mild steel skin. It protected roughly the middle two-thirds of the ship with a one-inch extension forward to the two-inch forward transverse [[bulkhead (partition)|bulkhead]] well short of the bow. The belt had a height of {{convert|23|ft|m|0}}, of which {{convert|18|in|m|1}} was below the designed waterline. From the former forward barbette, a 3-inch bulkhead extended out to the ship's side between the upper and lower decks and a comparable bulkhead was in place at the former location of the rear barbette as well. Four decks were armoured with thicknesses varying from {{convert|0.75|–|3|in}}, thickest over the magazines and the steering gear. After the [[Battle of Jutland]], {{convert|110|LT|t}} of extra protection was added to the deck around the magazines.<ref>Burt 1986, pp. 308, 313</ref>

The [[torpedo bulkhead]]s were increased during building from 0.75–{{convert|1.5|in|abbr=on}} in thickness.<ref>Roberts, pp. 54, 106, 113</ref> All three ships were fitted with a shallow [[anti-torpedo bulge]] integral to the hull, which was intended to detonate the torpedo before it hit the hull proper and deflect the underwater explosion to the surface, away from the ship. Later testing proved that it was not deep enough to accomplish its task and that it lacked the layers of empty and full compartments that were necessary to absorb the force of the explosion.<ref>Roberts, p. 111</ref>

=== Air groups ===
[[File:HMS Furious-15.jpg|thumb|right|300px|''Furious'' in the mid-1930s with a flight of [[Blackburn Baffin]] torpedo bombers overhead]]
Normally, ''Furious'' could carry only about 36 aircraft. In the 1920s this commonly meant one flight (squadrons after 1932) of fighters ([[Fairey Flycatcher]]), two of spotters ([[Blackburn Blackburn]] or [[Avro Bison]]), one spotter reconnaissance ([[Fairey III]]D) and two flights of torpedo bombers ([[Blackburn Dart]]). In 1935 there was one squadron of fighters with [[Hawker Nimrod]]s and [[Hawker Osprey]]s, one squadron of [[Blackburn Baffin]] torpedo bombers and one squadron of Fairey IIIF spotters. During the Second World War, the carrier typically carried a single fighter squadron and two of strike aircraft of various types, although the mix was often adjusted for specific missions.<ref name=b69 />

''Courageous'' and ''Glorious'' were generally similar except that they carried a total of 48 aircraft. They commonly flew the same types of aircraft as ''Furious'', although they are also known to have flown the [[Fairey Seal]], the [[Blackburn Shark]], and the [[Blackburn Ripon]].<ref>Burt 2012, p. 284</ref>

== Pre-war service ==
''Furious'' was assigned to the [[Atlantic Fleet (United Kingdom)|Atlantic Fleet]] after commissioning in 1925, although she spent much of the next several years conducting trials for practically every aircraft in the [[Fleet Air Arm]] (FAA) inventory. These included landing and flying-off tests of Fairey IIID and Fairey Flycatcher [[floatplane]]s, with and without wheels, to compare various designs of wooden and metal floats. The lower flight deck was greased to allow them to take off with a minimum of difficulty. A Flycatcher fitted with wooden skids was also tested and behaved perfectly satisfactorily.<ref name=f9 /><ref>Burt 2012, pp. 270–272</ref> The arresting gear was barely used during these trials and it was removed shortly afterwards. Deck-edge [[palisade]]s ([[windbreak]]s) were installed in 1927 to keep aircraft from blowing over the side in rough weather.<ref name=f5 /><ref>Jenkins, p. 271</ref> The first carrier night-landing was made by a Blackburn Dart on 6 May 1926 aboard ''Furious''.<ref>Jenkins, p. 274</ref>

The ship was reduced to reserve status on 1 July 1930 in preparation for a lengthy overhaul at Devonport from September 1930 to February 1932, focused on refitting her machinery and re-tubing her boilers.<ref name=b0>Burt 2012, p. 270</ref> In addition her quarterdeck was raised by one deck, the AA armament was revised and water spraying facilities were fitted in the hangars.<ref>Jenkins, pp. 275–276</ref> Upon completion she ran a full-power trial on 16 February 1932 where her maximum speed was {{convert|28.8|kn|abbr=on}} from a total of {{convert|89754|shp|abbr=on}}.<ref name=b0 />

''Furious'' was recommissioned in May 1932 as part of the Home Fleet with a reduced crew before being brought up to full complement in November.<ref name=j6>Jenkins, p. 276</ref> Transverse arresting gear was fitted sometime during the mid-1930s. She was detached to the [[Mediterranean Fleet]] from May to October 1934. ''Furious'' was present at the Coronation [[Fleet Review]] at [[Spithead]] on 20 May 1937 for King [[George VI]]. She became a deck-landing training carrier in 1937, although she was refitted between December 1937 and May 1938 in Devonport, where the forward end of her lower flight deck was raised to make her less wet forward. During the [[Munich Crisis]] in September 1938, she embarked Nos. [[801 Naval Air Squadron|801]], [[821 Naval Air Squadron|821]] and [[822 Naval Air Squadron|822 Squadrons]] and joined the fleet at [[Scapa Flow]], before resuming her training duties after the peaceful conclusion of the affair.<ref name="b69" /><ref name=j6 />

She was given a more extensive refit from January to May 1939 that removed her 5.5-inch guns and palisades, mounted AA guns on her flying-off deck, plated in the doors at the forward end of the upper hangar, and gave her a small island on the starboard side. ''Furious'' resumed her training duties after the completion of the refit and continued them until October 1939.<ref>Jenkins, pp. 277–278</ref>

[[File:HMS Courageous (50).jpg|thumb|left|''Courageous'' at anchor ({{circa|1935}})]]
''Courageous'' was recommissioned on 21 February 1928 and assigned to the Mediterranean Fleet from May 1928 to June 1930. She was relieved by ''Glorious'' and refitted from June to August 1930. The ship was assigned to the Atlantic and Home Fleets from 12 August 1930 to December 1938 aside from a temporary attachment to the Mediterranean Fleet in 1936. In the early 1930s, transverse arresting gear was installed and she received two hydraulic [[aircraft catapult|catapults]] on the upper flight deck before March 1934. ''Courageous'' was refitted again between October 1935 and June 1936 and received her ''pom-pom'' mounts. She was also present at the 1937 Coronation Fleet Review. She became a training carrier in December 1938 when {{HMS|Ark Royal|91|2}} joined the Home Fleet and continued on that duty until the start of the Second World War.<ref name=b15>Burt 2012, pp. 285–286, 290</ref>

[[File:HMS Glorious anchored.jpg|thumb|right|''Glorious'' at anchor ({{circa|1934}})]]
''Glorious'' was recommissioned on 24 February 1930 for service with the Mediterranean Fleet, but was attached to the Home Fleet from March to June 1930. She relieved ''Courageous'' in the Mediterranean Fleet in June 1930 and remained there until October 1939. In a fog on 1 April 1931 ''Glorious'' rammed SS ''Florida'' amidships while steaming at {{convert|16|knots|abbr=on}}. The impact crumpled {{convert|60|ft|1|abbr=on}} of the flying-off deck and forced ''Glorious'' to put into [[Gibdock|Gibraltar]] for temporary repairs. She had to sail to [[Malta Dockyard|Malta]] for permanent repairs which lasted until September 1931. Sometime in the early 1930s, transverse arresting gear was installed. She was refitted at Devonport from July 1934 to July 1935 where she received two catapults, her flight deck was extended to the rear, her quarterdeck was raised one deck and she received her multiple ''pom-pom'' mounts. ''Glorious'' also participated in the 1937 Coronation Fleet Review before returning to the Mediterranean.<ref>Burt 2012, pp. 285–288</ref>

== Second World War ==
=== ''Courageous'' ===
[[File:HMS Courageous sinking.jpg|thumb|right|250px|''Courageous'' sinking]]
In the early days of the war, [[Hunter-killer Group|hunter-killer groups]] were formed around the fleet aircraft carriers to find and destroy U-boats. On 17 September 1939,  U-boat {{GS|U-29|1936|2}} struck the ship with two torpedoes, and ''Courageous'' became the first British warship sunk to enemy action in the Second World War. As ''Ark Royal'' had been surprised by a near-miss seven days earlier, the fleet carriers were withdrawn from this duty.<ref>Rohwer, pp. 1–3</ref>

=== ''Glorious'' ===
Force J, including ''Glorious'', was organised to hunt for the {{ship|German pocket battleship|Admiral Graf Spee}} in the Indian Ocean. They were not successful, and ''Glorious'' remained in the Indian Ocean until December when she was transferred to the Mediterranean.

''Glorious'' was recalled to the Home Fleet in April 1940 to provide air cover for British forces landing in [[Norwegian Campaign|Norway]].<ref>Burt 2012, p. 285</ref> [[Gloster Gladiators]] of [[No. 263 Squadron RAF]] were flown aboard to be transferred to Norwegian airbases. ''Glorious'' and ''Ark Royal'' arrived off central Norway on 24 April where 263 Squadron was flown off and their organic aircraft attacked targets in the [[Trondheim (city)|Trondheim]] area before ''Glorious'' had to return to Scapa Flow on 27 April to refuel and embark new aircraft. She returned on 1 May, after failing to load new aircraft because of poor weather. The task force was under heavy air attack by the [[Luftwaffe]] all day and was withdrawn that evening.<ref>Haarr, pp. 143–154</ref>

''Glorious'' returned on 18 May with six [[Supermarine Walrus]] [[Amphibious aircraft|amphibious]] [[flying boat]]s of [[701 Naval Air Squadron|701 Squadron]] and 18 [[Hawker Hurricane]]s of [[No. 46 Squadron RAF]]. The Walruses were flown off to [[Harstad (town)|Harstad]], but the airfield in [[Skånland Municipality]] was not yet ready for the Hurricanes and they were still aboard when ''Glorious'' returned to Scapa on 21 May. ''Glorious'' came back to the [[Narvik (town)|Narvik]] area on 26 May and the Hurricanes were flown off.<ref>Haarr, pp. 261–262</ref>

British forces were ordered withdrawn a few days later. The evacuation (''[[Operation Alphabet]]'') began in the north on the night of 3/4 June, and ''Glorious'' arrived off the coast on 2 June to provide support. She carried only nine Sea Gladiators of [[802 Naval Air Squadron|802 Squadron]] and six Fairey Swordfish torpedo bombers of [[823 Naval Air Squadron|823 Squadron]] for self-defence, as it was hoped to evacuate the RAF fighters if possible. Ten Gladiators of 263 Squadron were flown aboard during the afternoon of 7 June and the Hurricanes of 46 Squadron were also flown aboard without any significant problems in the early evening despite having a much higher landing speed than the biplanes.<ref>Haarr, pp. 308–310</ref> This was the first time that high performance monoplanes without [[tailhook]]s had been landed on an aircraft carrier.<ref name=h61>Howland, p. 61</ref>

Captain [[Guy D'Oyly-Hughes]] requested and was granted permission to proceed independently to Scapa Flow in the early hours of 8 June. On the way back across the [[North Sea]], ''Glorious'' and her two escorting destroyers, {{HMS|Acasta|H09|2}} and {{HMS|Ardent|H41|2}}, were found by the two German battleships {{ship|German battleship|Scharnhorst||2}} and {{ship|German battleship|Gneisenau||2}}.<ref>Haarr, pp. 329–330</ref> No [[combat air patrol]] was being flown, no aircraft were spotted on the deck for quick take off and there was no lookout in the [[crow's nest]].<ref>Howland, p. 52</ref> The German heavy ships sank all three British vessels with most of their crews, although ''Acasta'' managed to torpedo ''Scharnhorst'' before she was sunk. Only 43 men from ''Glorious'' survived.<ref>Rohwer, p. 26</ref>

=== ''Furious'' ===
Until 2 October 1939, ''Furious'' remained on training duties, combined with anti-submarine sweeps off the east coast of Scotland.<ref>Jenkins, p. 277</ref> She was then assigned to the Home Fleet to replace the sunken ''Courageous'' and sortied on 8 October with the fleet to hunt unsuccessfully for the ''Gneisenau'' and escorting ships which had been spotted off southern Norway. ''Furious'' departed her berth adjacent to the battleship {{HMS|Royal Oak|08|2}} in Scapa Flow for more futile searches for German ships on 13 October, the day before ''Royal Oak'' was sunk by {{GS|U-47|1938|2}} in Scapa Flow. ''Furious'' served as the flagship for the convoy bringing most of the [[1st Canadian Infantry Division]] to Britain in mid-December 1939.<ref>Jenkins, p. 279</ref>

''Furious'' joined the Home Fleet off the coast of Norway on 10 April 1940 and her Swordfish made several attacks on German ships in Narvik on the following days. She refuelled at [[Tromsø (city)|Tromsø]] on the 14th and remained behind after the bulk of the Home Fleet departed on 15 April, her aircraft flying reconnaissance missions until ordered home on 25 April. Her port inner turbine had been damaged by the shock wave from a near miss on 18 April, and the damage was more serious than initially thought. After quick repairs, ''Furious'' returned on 18 May carrying the Gladiators of a reformed 263 Squadron; they were flown off on 21 May once their base at [[Bardufoss Air Station|Bardufoss]] was ready. She sailed to Scapa Flow once all the Gladiators had been flown off.<ref>Haarr, pp. 139–141, 261</ref>

On 14 June, carrying only half of [[816 Naval Air Squadron|816 Squadron]] for her own protection, ''Furious'' sailed unescorted for [[Halifax Regional Municipality|Halifax, Nova Scotia]] carrying £18,000,000 in gold [[bullion]]. On 1 July she escorted a convoy of Canadian troops bound for [[Iceland]] from Halifax and ferried over almost 50 aircraft, spare parts and munitions. On his own initiative, Captain [[Thomas Hope Troubridge|Troubridge]] ordered all available space should be used for sugar bound for Britain. She reembarked her aircraft upon her arrival and made a number of air strikes on shipping in Norwegian waters and on the seaplane base at Tromsø through October 1940.<ref>Jenkins, p. 283</ref> ''Furious'' loaded 55 aircraft in [[Liverpool]] on 7 November and sailed for [[Takoradi]], [[Gold Coast (British colony)|Gold Coast]], on 15 November where the aircraft were flown off on 27 November to reinforce fighter units defending [[Desert Air Force|Egypt]]. By 15 December, ''Furious'' was back in Liverpool, where she embarked 40 Hurricanes for Takoradi. She sailed on 21 December and joined up with [[Convoy WS 5A]] which encountered the {{ship|German cruiser|Admiral Hipper||2|up=y}} on 25 December. The German ship was driven off by the escorts, and ''Furious'' reached Takoradi on 10 January 1941. She arrived in Britain on 5 February where she was given a brief refit. She made another ferry trip to Takoradi between 4 and 22 March.<ref>Nailer, pp. 154–155</ref>

Now with a new destination for her ferry trips, ''Furious'' transported two dozen Hurricanes to Gibraltar on 25 April where they were transferred to ''Ark Royal'' to be flown off for [[Siege of Malta (World War II)|Malta]]. She returned for another load of Hurricanes and arrived back in Gibraltar on 18 May. Some of these fighters were moved to ''Ark Royal'' via planks between the flight decks of the carriers berthed stern to stern. This time she accompanied ''Ark Royal'' and the two carriers flew off their fighters from a position south of Sardinia. She would repeat this ferry mission three more times from June to September 1941.<ref>Nailer, p. 165</ref> In July and August, ''Furious'' and {{HMS|Victorious|R38|2}} attacked German installations in the Arctic areas of Norway and Finland with limited success and heavy losses. Following her last ferry mission she was sent to [[Philadelphia]], Pennsylvania, to refit.<ref>Jenkins, p. 284</ref>

[[File:A Supermarine Seafire being brought up onto the flight deck of HMS FURIOUS, August 1944. A25076.jpg|thumb|A [[Supermarine Seafire]] being brought up onto the flight deck of ''Furious'', August 1944]]

''Furious'' arrived back in the UK in April 1942 and spent the next three months [[Glossary of nautical terms (M-Z)#working up|working up]]. In August she was detailed to accompany the convoy bound for Malta in [[Operation Pedestal]], but she was to sail with them only far enough to allow her 38 [[Supermarine Spitfire]]s to reach Malta. This she did, just as ''Eagle'' was torpedoed, but ''Furious'' turned around after flying off her fighters and reached Gibraltar successfully. She loaded another batch of 32 Spitfires on 16 August and they were flown off the following day south-east of the [[Balearic Islands]]. After this mission ''Furious'' was sent back to Home Fleet for training. One last mission was necessary to reinforce the defences of Malta before [[Operation Torch]], and she arrived on 27 October. She loaded 32 Spitfires and launched them on the 29th before returning to Gibraltar to participate in Torch.<ref>Nailer, pp. 164–165</ref>

Providing cover for the Central Task Force, ''Furious''{{'}}s aircraft neutralised the airfields at [[Es Sénia|La Senia]] and [[Tafraoui]], both near [[Oran]], Algeria. She remained with Force H until February 1943 before transferring to Home Fleet where she remained for the rest of the war. In July the Home Fleet demonstrated off the coast of Norway in strength to distract attention from the [[Allied invasion of Sicily]]; ''Furious''{{'}}s role was to allow a German reconnaissance aircraft to spot the British ships and make a report then shoot it down.<ref>Jenkins, pp. 284–285</ref> She was refitted in August and spent the rest of the year training.<ref name=b2>Burt 2012, p. 277</ref>

On 3 April 1944, [[Fairey Barracuda]]s from ''Furious'' and ''Victorious'' attacked the German battleship ''Tirpitz'' in [[Altafjord]], Norway, as part of [[Operation Tungsten]]. ''Tirpitz'' was hit 14 times and needed three months to complete her repairs, although four aircraft were lost in the attack. The Home Fleet tried another attack on ''Tirpitz'' later in the month, but bad weather prevented any attack from being made. Instead the aircraft attempted to attack installations at [[Bodø (town)|Bodø]], but found a German convoy instead and sank three ships. Three operations against targets in northern Norway, including two against ''Tirpitz'', had to be abandoned or diverted to other targets in May, but three German ships were sunk and two more were set afire. ''Furious'' and other carriers made another attempt to sink the ''Tirpitz'' on 17 July, but were unsuccessful against the fully alerted German defences. Four more attacks on ''Tirpitz'' were made in August, but only the attack on the 24th was even partially successful as two minor hits were made.<ref>Rohwer, pp. 314, 320, 322, 343, 350–351</ref>

As the war progressed, the ship's age and limitations became increasingly apparent, and ''Furious'' was placed in reserve on 15 September 1944. She was [[paid off]] in April 1945 and used to evaluate the effects of aircraft explosives on the ship's structure. She was sold in 1948 for scrap, which was completed in 1954 at [[Troon]].<ref name=b2 />

== Notes ==
{{Reflist|25em}}

== References ==
* {{cite book|last=Brown|first=David|title=HMS Eagle|series=Warship Profile|volume=35|year=1973|publisher=Profile Publications|location=Windsor, Berkshire, UK|oclc=33084560}}
* {{cite book|last=Burt|first=R. A.|title=British Battleships, 1919–1939|year=2012|edition=2nd|publisher=Naval Institute Press|location=Annapolis, Maryland|isbn=978-1-59114-052-8}}
* {{cite book|last=Burt|first=R. A.|title=British Battleships of World War One|publisher=Naval Institute Press|location=Annapolis, Maryland|year=1986|isbn=0-87021-863-8}}
* {{cite book|last=Campbell|first=John|title=Naval Weapons of World War II|year=1985|publisher=Naval Institute Press|location=Annapolis, Maryland|isbn=0-87021-459-4}}
* {{cite book|last=Friedman|first=Norman|title=British Carrier Aviation: The Evolution of the Ships and Their Aircraft|year=1988|publisher=Naval Institute Press|location=Annapolis, Maryland|isbn=0-87021-054-8|author-link=Norman Friedman}}
* {{cite book|last=Haarr|first=Geirr H.|title=The Battle for Norway: April–June 1940|year=2010|publisher=Naval Institute Press|location=Annapolis, Maryland|isbn=978-1-59114-051-1}}
* {{cite journal|last=Howland|first=Vernon W., Captain, RCN|year=1994|title=The Loss of HMS Glorious: An Analysis of the Action|journal=Warship International|publisher=International Naval Research Organization|volume=XXXI |issue=1 |pages=47–62|url=http://www.warship.org/no11994.htm|archive-date=22 May 2001|archive-url=https://web.archive.org/web/20010522092000/http://www.warship.org/no11994.htm}}
* {{cite book|last=Jenkins|first=C. A., Commander|title=HMS Furious/Aircraft Carrier 1917–1948: Part II: 1925–1948|series=Warship Profile|volume=24|year=1972|publisher=Profile Publications|location=Windsor, Berkshire, UK|oclc=10154565}}
* {{cite book|last=Nailer|first=Roger|editor=Gardiner, Robert|title=Warship 1990|year=1990|publisher=Naval Institute Press|location=Annapolis, Maryland|isbn=1-55750-903-4|chapter=Aircraft to Malta|pages=151–165}}
* {{cite book |last=Roberts |first=John |title=Battlecruisers |publisher=Naval Institute Press |location=Annapolis, Maryland |year=1997 |isbn=1-55750-068-1 |oclc=38581302}}
* {{cite book|last=Rohwer|first=Jürgen|title=Chronology of the War at Sea 1939–1945: The Naval History of World War Two|publisher=Naval Institute Press|location=Annapolis, Maryland|year=2005|edition=Third Revised|isbn=1-59114-119-2 |author-link=Jürgen Rohwer}}

== External links ==
{{Commons category|Glorious class cruiser/aircraft carrier}}
* [http://www.battleships-cruisers.co.uk/courageous_class.htm Photo gallery of ''Courageous'' and ''Glorious'']
* [http://www.battleships-cruisers.co.uk/hms_furious.htm Photo gallery for ''Furious'' as both battlecruiser and aircraft carrier]

{{Courageous class aircraft carrier}}
{{WWI British ships}}
{{WWII British ships}}
{{Subject bar
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[[Category:Aircraft carrier classes]]
[[Category:Courageous-class aircraft carriers| ]]
[[Category:Ship classes of the Royal Navy]]
[[Category:World War I aircraft carriers of the United Kingdom| ]]
[[Category:World War II aircraft carriers of the United Kingdom| ]]