伊勢級戦艦 (日本海軍, 1916)

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specifications

Displacement: 33,260t standard; 36,500t full load
Dimensions: 675ft oa, 640ft x 94ft x 29ft 1in
205.8m, 195.1m x 28.7m x 8.8m
Machinery: 4-shaft Curtis (Hyuga Parsons) turbines, 24 Kampon boilers, 45,000shp = 23kts. Coal 4706t, oil 1411t. Range 9680nm at 14kts
Armour: Belt 12in-4in (305mm-102mm), barbettes and turrets 12in-8in (305mm-203mm), forward CT 12in, aft CT 6in (152mm), decks 2.2in-1.3in (55mm-34mm)
Armament: 12-14in (356mm)/45 (6x2), 20-5.5in (140mm)/50, 4-3.1in/40 AA, 6-21in (533mm) TT sub
Complement: 1360

units

Name Builder Laid down Launched Comp Fate Note
伊勢 Ise 川崎神戸 1915.05.10 1916.11.12 1917.12.15 1945.07.28 擱座
日向 Hyuga 三菱長崎 1915.05.06 1917.01.27 1918.04.30 1945.07.24 擱座

explanation

text in 1922 volume

In 1926-28 the foremast was rebuilt, and 1-2 aircraft added. Both ships underwent major reconstruction, Ise between 1935 and 1937, and Hyuga between 1934 and 1936, being altered similarly to the Fuso class. The total weight of armour increased from 9525t to 12,644t. Data was now:

Displacement: 35,800t (Hyuga 36,000t) standard; 39,535t (Hyuga 39,031t) trial
Dimensions: Changed as follows - 700ft wl, 708ft oa x 104ft x 30ft 2in
213.36m, 215.80m x 31.70m x 9.21m
Machinery: 4-shaft geared turbines, 8 boilers, 80,000shp = 25.3kts. Oil 5313t
Armour: Changed as follows - deck 3.8in (middle deck), 2in (upper deck). See notes for Fuso class
Armament: 12-14in/45 (6x2), 16-5.5in/50 (16x1), 8-5in/40 DP (4x2), 20-25mm AA, 3 aircraft
Complement: 1376

As a result of the carrier losses at Midway, both were converted in 1943 into hybrid battleship-carriers; 'X' and 'Y' turrets were removed, and hangar and flight deck built on to the quarterdeck. The 22 seaplanes were to be launched by catapult, and recovered from the sea by crane, as the deck was much too short for landing. The 5.5in armament was removed and the AA armament increased. Data now became:

Displacement: 35,350t standard; 38.065t trial
Dimensions: Changed as follows - length 720ft 5in oa, draught 29ft 7in
219.62m, 9.03m
Machinery: Unchanged except 4249t oil
Armament: 8-14in/45 (4x2), 16-5in/40 DP (8x2), 57-25mm AA, 22 aircraft
Complement: 1463

The light AA armament was increased to 104-25mm AA in June 1944, and 6 28-barrelled rocket launchers added in September 1944. The two catapults were removed in October, and no aircraft were aboard in the Leyte Gulf operations. Both were sunk in shallow water at Kure by US aircraft, and were broken up after the war.