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大型巡洋艦

アラスカ級　ＡＬＡＳＫＡ　ＣＬＡＳＳ

基準排水量：27,000ｔ　満載排水量：34,253ｔ　全長：246.40ｍ　幅：27.70ｍ　吃水：9.20ｍ　主缶：バブコック＆ウィルコックス缶8基　主機／軸数：ジェネラル・エレクトリック式ギヤード蒸気タービン4基／4軸　出力：150,000馬力　速力：33.0kt　燃料搭載量：重油3,710t　航続力：15ktで12,000浬　兵装：50口径305㎜3連装砲3基、38口径127㎜連装両用砲6基、56口径40㎜4連装機銃14基、70口径20㎜単装機銃34基　装甲：水線229㎜、甲板102㎜、砲塔前楯325㎜、砲塔天蓋127㎜、司令塔269㎜　乗員：士官73名、下士官兵1,444名

↑アラスカ級大型巡洋艦アラスカ（CB-1）

※1940年1月18日のCA2-D案

基準排水量：38,700ｔ　吃水線長：259.08ｍ　幅：31.85ｍ　吃水：9.60ｍ　出力：212,000馬力　速力：33.5kt　兵装：50口径305㎜3連装砲4基、38口径127㎜連装両用砲8基

↑CA2-D案

↑"Proposed Heavy Cruiser - CA2-D". Preliminary design plan prepared for the General Board as part of the process leading to the Alaska class large cruiser design. This plan, dated 18 January 1940 and representing the largest size cruiser studied at this time, is for a ship of 38,700 tons standard displacement, with a main battery of twelve 12"/50 guns, a secondary battery of sixteen 5"/38 guns and a 212,000 horsepower powerplant for a speed of 33.5 knots. Ship's dimensions are: waterline length 850'; waterline beam 99'; maximum beam 104.5'; draft 31.5'. Anti-torpedo side protection, with four internal bulkheads, is shown in the hull section drawing at the lower left. Scale of the original plan and elevation drawings is 1/32" = 1'. Scale of the hull section drawing is 1/16" = 1'. The original plan is in the 1939-1944 "Spring Styles Book" held by the Naval Historical Center. U. S. Naval Historical Center Photograph.

※1940年1月19日のCA2-A案

基準排水量：25,600ｔ　吃水線長：243.84ｍ　幅：27.43ｍ　吃水：8.16ｍ　出力：150,000馬力　速力：33.5kt　兵装：50口径305㎜3連装砲3基、38口径127㎜連装両用砲6基

↑"Proposed Heavy Cruiser - CA2-A". Preliminary design plan prepared for the General Board as part of the process leading to the Alaska class large cruiser design. This plan, dated 19 January 1940 and representing the smallest size cruiser studied at this time, is for a ship of 25,600 tons standard displacement, with a main battery of nine 12"/50 guns, a secondary battery of twelve 5"/38 guns and a 150,000 horsepower powerplant for a speed of 33.5 knots. Ship's dimensions are: waterline length 800'; waterline beam 85.1'; maximum beam 90'; draft 26.8'. Anti-torpedo side protection, with four internal bulkheads, is shown in the hull section drawing at the lower left. Scale of the original plan and elevation drawings is 1/32" = 1'. Scale of the hull section drawing is 1/16" = 1'. The original plan is in the 1939-1944 "Spring Styles Book" held by the Naval Historical Center. U. S. Naval Historical Center Photograph.

※1940年3月19日のScheme 2案

基準排水量：15,750ｔ　吃水線長：213.36ｍ　幅：21.94ｍ　吃水：7.16ｍ　出力：120,000馬力　兵装：55口径203㎜3連装砲4基、38口径127㎜連装両用砲6基

↑"Heavy Cruiser Study - Scheme 2". Preliminary design plan prepared for the General Board as part of the process leading to the Alaska class large cruiser design. This plan, dated 19 March 1940 and representing the smallest size cruiser studied in this series, is for a ship of 15,750 tons standard displacement, with a main battery of twelve 8"/55 guns, a secondary battery of twelve 5"/38 guns and a 120,000 horsepower powerplant. Ship's dimensions are: waterline length 700'; beam 72'; draft 23.5'. Scale of the original drawings is 1/32" = 1'. The original plan is in the 1939-1944 "Spring Styles Book" held by the Naval Historical Center. U. S. Naval Historical Center Photograph.

※1940年3月20日のScheme 3案

基準排水量：17,300ｔ　吃水線長：216.40ｍ　幅：22.55ｍ　吃水：7.46ｍ　出力：120,000馬力　兵装：50口径305㎜連装砲3基、38口径127㎜連装両用砲6基

↑"Heavy Cruiser Study - Scheme 3". Preliminary design plan prepared for the General Board as part of the process leading to the Alaska class large cruiser design. This plan, dated 20 March 1940, is for a ship of 17,300 tons standard displacement, with a main battery of six 12"/50 guns, a secondary battery of twelve 5"/38 guns and a 120,000 horsepower powerplant. Ship's dimensions are: waterline length 710'; beam 74'; draft 24.5'. Scale of the original drawings is 1/32" = 1'. The original plan is in the 1939-1944 "Spring Styles Book" held by the Naval Historical Center. U. S. Naval Historical Center Photograph.

※1940年4月10日のScheme 4A案

基準排水量：17,500ｔ（Scheme 4B案は17,850ｔ）　吃水線長：216.40ｍ　幅：22.70ｍ　吃水：7.52ｍ（Scheme 4B案は7.62ｍ）　出力：120,000馬力　速力：33.1kt（Scheme 4B案は33.0kt）　兵装：55口径203㎜3連装砲4基（第1、第2、第4砲塔を50口径305㎜連装砲に換装可能。Scheme 4B案は50口径305㎜連装砲3基）、38口径127㎜連装両用砲6基

↑"Heavy Cruiser Study - Scheme 4-A - "Convertible"". Preliminary design plan prepared for the General Board as part of the process leading to the Alaska class large cruiser design. This plan, dated 10 April 1940, is for a ship of 17,500 tons standard displacement, with a main battery of twelve 8"/55 guns (convertible to six 12"/50 guns in twin turrets, mounted in the 1st, 2nd and 4th barbettes), a secondary battery of twelve 5"/38 guns and a 120,000 horsepower powerplant for a speed of 33.1 knots. Ship's dimensions are: waterline length 710'; beam 74.5'; draft 24.7'. Scale of the original drawings is 1/32" = 1'. The design would be similar if fitted with six 12"/50 guns (Scheme 4B), but displacement rises to 17,850 tons, draft increases to 25 feet, speed drops to 33.0 knots and the ship would trim down 2.4 feet by the head. The original plan is in the 1939-1944 "Spring Styles Book" held by the Naval Historical Center. U. S. Naval Historical Center Photograph.

※1940年6月19日のCA2F案

基準排水量：24,700ｔ（CA2E案は24,100ｔ、CA2G案、CA2H案は27,500ｔ）　満載排水量：28,300ｔ　吃水線長：228.60ｍｔ（CA2E案は225.55ｍ、CA2G案、CA2H案は240.79ｍ）　幅：25.60ｍ（CA2G案、CA2I案は26.21ｍ、CA2H案は26.51ｍ）　吃水：8.83ｍ（CA2G案は9.14ｍ、CA2H案は8.83ｍ）　出力：150,000馬力（CA2H案は100,000馬力、CA2I案は120,000馬力）　速力：33.0kt（CA2H案は30.5kt、CA2I案は31.5kt）　兵装：50口径305㎜3連装砲1基、50口径305㎜連装砲2基（CA2E案は50口径305㎜連装砲3基、CA2G案は50口径305㎜連装砲4基、CA2H案は50口径305㎜3連装砲3基）、38口径127㎜連装両用砲6基

↑"12-Inch Gun Cruiser Study, CA2F" (with hull sections for Schemes CA2E & F, G, H & I). Preliminary design plan prepared for the General Board as part of the process leading to the Alaska class large cruiser design. This plan, dated 19 June 1940, is for a ship (CA2F) of 24,700 tons standard displacement and 28,300 tons trial displacement, with a main battery of seven 12"/50 guns, a secondary battery of twelve 5"/38 guns, and a 150,000 horsepower powerplant for a speed of 33 knots. Ship's dimensions are: waterline length 750'; beam 84'; draft 29'. Scale of the original plan and side elevation drawings is 1/32" = 1'. The hull sections (original scale 1/16" = 1') represent anti-torpedo side protection alternatives, resulting in differing hull sizes, main batteries, powerplants, speeds and other features: CA2E (standard displacement 24,100 tons, 740' length, and six 12" guns. Otherwise as CA2F) & CA2F with double bottom extending upward to a single inboard bulkhead; CA2G with triple bottom extending upward to two inboard bulkheads (standard displacement 27,500 tons, 790' length, 86' beam, 30' draft, and eight 12" guns); and CA2H & CA2I with triple bottom and four inboard bulkheads, plus improved armor protection. CA2H would have had a 27,500 ton standard displacement, 790' length, 87' beam, 29' draft, 100,000 HP powerplant for 30.5 knots, and nine 12" guns. CA2I would have been similar, but with 86' beam, 120,000 HP for 31.5 knots, and seven 12" guns. The original plan is in the 1939-1944 "Spring Styles Book" held by the Naval Historical Center. U. S. Naval Historical Center Photograph.

※1942年1月3日にアラスカ級を航空母艦に改装する案を作成

飛行甲板長：255.72ｍ

↑"Aircraft Carrier, Converted from 12" Cruiser (Class CB-1-CB-6)". Preliminary design plan prepared for the General Board as part of an exploration of carrier conversions of warship hulls then under construction. This plan, marked "Advance Print" and dated 3 January 1942, represents the conversion of Alaska class large cruiser hulls. It would have produced a ship similar in external appearance to the Essex class, but with lower freeboard, only two aircraft elevators, one catapult, and an 839' long flight deck somewhat offset to the port side. Aircraft capacity would have been lower than in the Essex design, with markedly reduced steaming endurance and modest anti-torpedo protection for the hull sides. The original plan is in the 1939-1944 "Spring Styles Book" held by the Naval Historical Center. U. S. Naval Historical Center Photograph.

↑USS Alaska (CB-1). Photographed from USS Missouri (BB-63) off the U. S. east coast during their shakedown cruise together in August 1944. Note her Measure 32 camouflage. Official U. S. Navy Photograph, now in the collections of the National Archives.

※1947年、ハワイ（CB-3）をミサイル搭載艦に改装する案があった。艦前半部は航空機搭載施設に、艦後半部に当時計画中のタロスSAM（Bumblebee計画）とドイツのV2型弾道ミサイルを搭載する案。以降、いくつかの案が浮上する。例えば1957年試案ではポラリスSLBM、タロスSAM、ターターSAM搭載する計画だったが、いずれも計画のみに終わる

艦名	NAME	艦種記号	建造所	竣工日	退役日	除籍日	備考
アラスカ	Alaska	CB-1	ニュー・ヨーク・シップビルディング社	1944/6/17	1947/2/17	1960/6/1	◎1941/12/17　起工 ◎1943/8/15　進水 ◎フィラデルフィア海軍工廠にて竣工 ◎退役後、ベイヨーンにて保管 ◎1960/6/30　解体のため、ニュー・ヨークのLipsett Division of Luria Brothersに売却
グアム	Guam	CB-2	ニュー・ヨーク・シップビルディング社	1944/9/17	1947/2/17	1960/6/1	◎1942/2/2　起工 ◎1943/11/12　進水 ◎退役後、ニュー・ヨークにて大西洋予備艦隊に編入 ◎1961/5/24　解体のため、ボルティモアのボストン・メタルズ社に売却
ハワイ	Hawaii	CB-3	ニュー・ヨーク・シップビルディング社	―	―	1958/6/9	◎1943/12/20　起工 ◎1945/3/11（1945/11/3？）　進水 ◎1947/2/17　82.4％の完成度で建造中止（1947年9月には84％の完成度） ◎1940年代後半　ミサイル艦への改装計画が考慮されたが計画のみに終わる ◎1952/2/26　艦種を大型戦術指揮艦（CBC-1）に改める ◎1954/10/9　艦種を大型巡洋艦（CB-3）に改める ◎1957　再度、ミサイル艦への改装計画が考慮されたが計画のみに終わる ◎1959/4/15　解体のため、ボルティモアのボストン・メタルズ社に売却
フィリピン	Philippines	CB-4	ニュー・ヨーク・シップビルディング社	―	―		◎1943/6/24　未着手のまま建造中止
プエルト・リコ	Puerto Rico	CB-5	ニュー・ヨーク・シップビルディング社	―	―		◎1943/6/24　未着手のまま建造中止
サモア	Samoa	CB-6	ニュー・ヨーク・シップビルディング社	―	―		◎1943/6/24　未着手のまま建造中止

Ｕｐｄａｔｅ　08／04／09