Pennsylvania 1916
| No | Name | Builder | Laid down | Launched | Comm | Fate |
| BB38 | Pennsylvania | Newport News | 27/10/1913 | 16/3/1915 | 12/6/1916 | target for nuclear tests 2/1946 |
| BB39 | Arizona | New York N Yd, Brooklyn | 16/3/1914 | 19/6/1915 | 17/10/1916 | sunk 7/12/1941 |
|
Displacement normal, t |
31400 |
|
Displacement full, t |
32567 |
|
Length, m |
182.9 wl 185.4 oa |
|
Breadth, m |
29.6 |
|
Draught, m |
8.80 |
|
No of shafts |
4 |
|
Machinery |
BB38: Curtis steam turbines, 12 Babcock & Wilcox boilers BB39: Parsons steam turbines, 12 Babcock & Wilcox boilers |
|
Power, h. p. |
31500 |
|
Max speed, kts |
21 |
|
Fuel, t |
oil 2300 |
|
Armour, mm |
belt: 343 - 203, deck: 76, 63 over steering gear, splinter deck: 51 - 25, barbettes: 330 - 114, turrets: 457 face, 254 - 229 sides, 229 rear, 127 crowns, CT: 406 sides, 127 roof |
|
Armament |
4 x 3 - 356/45 Mk 1/2/3/5, 22 x 1 - 127/51 Mk 7/8/9, 4 x 1 - 76/50 Mk10, 2 - 533 TT (beam) |
|
Complement |
915 |
Ship project history: These two ships were built under 1913 (BB38) and 1914 (BB39) programs. Enlarged variant of Nevada class, with four triple main gun turrets and twenty two 127/51mm secondary guns. The protection scheme practically completely repeated accepted on the previous class. Besides armament gain, the gain of displacement (more than on 4000t) has spent on improvement of underwater protection.
Ship protection: 125m belt had 5.3m height and was 343mm thick at upper part tapering to 203mm at lower edge. Belt was connected with end barbettes by 320mm bulkheads. There was 2.6m in height 203mm belt at 18.3m length aft from aft bulkhead, protecting steering gear, it was closed aft by 343mm bulkhead. Flat main armour deck was connected with upper edge of belt and was 89mm over citadel. One level lower was 38mm splinter deck with 51mm slopes, slopes were connected with lower edge of belt. This deck was 63mm thick aft from citadel, protecting steering gear. Main gun turrets had 457mm faces, 254-229mm sides, 229mm rears and 127mm crowns. Barbettes were 330mm over and 114mm under main deck. CT had 406mm sides and 127mm roof. Underwater protection was 3.6m deep. There was 76mm longitudinal bulkhead.
Modernizations: 1919 - 1920, both: + 4 x 1 - 76/50 Mk 10 AA
1925, both: + 1 catapult with 1 seaplane (MO, UO, VE or OL)
(6/1929 - 5/1931, Philadelphia NYd) Pennsylvania, (5/1929 - 3/1931, Norfolk NYd) Arizona were modernized as follows. New machinery and boilers were fitted, horizontal armour was strengthened, part of secondary guns was moved one deck up. Maximal main guns elevation angle was increased up to 30°.
Arizona 1931
Pennsylvania 1945
|
Displacement standard, t |
33384 |
|
Displacement full, t |
35929 |
|
Length, m |
182.9 wl 185.3 oa |
|
Breadth, m |
32.4 |
|
Draught, m |
9.19 full load |
|
No of shafts |
4 |
|
Machinery |
BB38: Westinghouse geared steam turbines, 5 White-Foster & 1 Bureau Express boilers BB39: 2 Parsons steam turbines, 2 Westinghouse geared steam turbines, 6 Bureau Express boilers |
|
Power, h. p. |
33375 |
|
Max speed, kts |
21 |
|
Fuel, t |
oil 3778 (6274 max) |
|
Armour, mm |
belt: 343 - 203, bulkheads: 330, deck: 121, 63 over steering gear, splinter deck: 51 - 25, barbettes: 330 - 114, turrets: 457 face, 254 - 229 sides, 229 rear, 127 crowns, CT: 406 sides, 203 roof |
|
Armament |
4 x 3 - 356/45 Mk 8/9/10/12, 12 x 1 - 127/51 Mk 7/8/9/14/15, 8 x 1 - 127/25 Mk 10/11/13, 2 catapults, 3 seaplanes (OJ, O2U, O3U) |
|
Complement |
1052 |
Ship protection after modernization: 125m belt had 5.3m height and was 343mm thick at upper part tapering to 203mm at lower edge. Belt was connected with end barbettes by 320mm bulkheads. There was 2.6m in height 203mm belt at 18.3m length aft from aft bulkhead, protecting steering gear, it was closed aft by 343mm bulkhead. Flat main armour deck was connected with upper edge of belt and was 121mm over citadel. One level lower was 38mm splinter deck with 76mm slopes, slopes were connected with lower edge of belt. This deck was 63mm thick aft from citadel, protecting steering gear. Main gun turrets had 457mm faces, 254-229mm sides, 229mm rears and 127mm crowns. Barbettes were 330mm over and 114mm under main deck. CT had 406mm sides and 203mm roof. Underwater protection was 5.8m deep. There was 76mm longitudinal bulkhead.
Modernizations: mid-1941, both: + (8 - 9) x 1 - 12.7/90
mid-1941, Pennsylvania: + 4 x 1 - 76/50 Mk 10/19/20/21
early 1942, Pennsylvania: - 4 x 1 - 76/50; + 4 x 4 - 28/75 Mk 1, 16 x 1 - 20/70 Oerlikon, CXAM, Mk 3 radars
1/1943, Pennsylvania: CT was removed; - 12 x 1 - 127/51, 8 x 1 - 127/25, 4 x 4 - 28/75, 1 catapult, CXAM radar; + 8 x 2 - 127/38 Mk 12, 10 x 4 - 40/56 Bofors, 34 x 1 - 20/70 Oerlikon, SG, SK, SR, Mk 3 (2nd), 2 x Mk 4 radars
7/1945, Pennsylvania: - 23 x 1 - 20/70 Oerlikon, Mk 3 radar; + 1 x 2 - 40/56 Bofors, 22 x 2 - 20/70 Oerlikon, SC-2, SP, Mk 8 radars
Naval service: Arizona was stricken in Pearl Harbor by 1 torpedo and 5 - 8 bombs from B5N2 bombers from Kaga, received hit of a bomb into magazine, has blown up and sunk. The sunk wreck is preserved as a military memorial. Pennsylvania was easily damaged 7/12/1941 during raid of Japanese carrier to Pearl Harbour and repaired till the end of March, 1942; 12/8/1945 she was damaged by Japanese air torpedo; the partial repair completed in October, 1945.
Pennsylvania 1920
Pennsylvania 1943
© Ivan Gogin, 2008-10