Or, as the Design Bureau jokes, "adequate battleships"...
Attached are three possible Indian battleships in the ~31,000 t range. I was shooting for 30,000 t but overshot just a bit, and couldn't see a way to trim it down without going to Walter's "battleship/oiler" route.
I'd appreciate thoughts on these. None will set the world afire or revolutionize warfare at sea - they are intended to be good enough. Are they?
(Don't ask about versions 1-3...)
IBB27, version 4l, laid down 1927
Length, 723 ft x Beam, 99.0 ft x Depth, 29.0 ft
33805 tons normal displacement (31003 tons standard)
Main battery: 9 x 13.8-inch (3 x 3; 1 superfiring)
Secondary battery: 14 x 4.9-inch (7 x 2)
AA battery: 14 x 1.4-inch
Light battery: 14 x 0.6-inch
Weight of broadside: 12671 lbs
Main belt, 13.0 inches; ends unarmored
Torpedo bulkhead, 1.0 inches
Armor deck, average 4.5 inches
C.T., 14.0 inches
Battery armor:
Main, 14.0" / secondary, 3.0"
AA, 1.0" shields / light guns, 1.0" shields
Maximum speed for 104768 shp = 28.00 knots
Approximate cruising radius, 10000 nm / 15 kts
Typical complement: 1247-1620
Estimated cost, $40.987 million (£10.247 million)
Remarks:
Relative extent of belt armor, 90 percent of 'typical' coverage.
Ship is roomy, with superior accommodation and working space.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 1584 tons = 5 pct
Armor, total ..................... 11033 tons = 33 pct
Belt 2787 tons = 8 pct
Torpedo bulkhead 504 tons = 1 pct
Deck 4089 tons = 12 pct
C.T. 317 tons = 1 pct
Armament 3336 tons = 10 pct
Machinery ........................ 3307 tons = 10 pct
Hull and fittings; equipment ..... 13148 tons = 39 pct
Fuel, ammunition, stores ......... 4534 tons = 13 pct
Miscellaneous weights ............ 200 tons = 1 pct
-----
33805 tons = 100 pct
Estimated metacentric height, 5.7 ft
Displacement summary:
Light ship: 29271 tons
Standard displacement: 31003 tons
Normal service: 33805 tons
Full load: 35911 tons
Loading submergence 1403 tons/foot
+++++++++++++++++++++++++
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.08
Shellfire needed to sink: 37012 lbs = 28.2 x 13.8-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 5.0
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 61 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.51
Relative quality as a seaboat: 1.08
+++++++++++++++++++++++++
Hull form characteristics:
Block coefficient: 0.57
Sharpness coefficient: 0.39
Hull speed coefficient 'M' = 6.84
'Natural speed' for length = 26.9 knots
Power going to wave formation
at top speed: 51 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 87 percent
Relative accommodation and working space: 150 percent
Displacement factor: 112 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.00
(Structure weight per square
foot of hull surface: 191 lbs)
Relative longitudinal hull strength: 1.17
(for 20.0 ft average freeboard;
freeboard adjustment +0.7 ft)
Relative composite hull strength: 1.02
+++++++++++++++++++++++++
[Machine-readable parameters: Spring Style v. 1.2.1]
723.00 x 99.00 x 29.00; 20.00 -- Dimensions
0.57 -- Block coefficient
1927 -- Year laid down
28.00 / 10000 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
200 tons -- Miscellaneous weights
++++++++++
9 x 13.80; 3; 1 -- Main battery; turrets; superfiring
:
14 x 4.90; 7 -- Secondary battery; turrets
:
14 x 1.40 -- Tertiary (QF/AA) battery
Gun-shields
:
14 x 0.60 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
13.00 / 0.00 / 0.00 / 1.00; 90 -- Belt armor; relative extent
4.50 / 14.00 -- Deck / CT
14.00 / 3.00 / 1.00 / 1.00 -- Battery armor
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
IBB27, version 5, laid down 1927
Length, 780 ft x Beam, 96.0 ft x Depth, 30.0 ft
35301 tons normal displacement (30978 tons standard)
Main battery: 9 x 13.8-inch (3 x 3; 1 superfiring)
Secondary battery: 14 x 4.9-inch (7 x 2)
AA battery: 8 x 1.4-inch
Light battery: 8 x 0.6-inch
Weight of broadside: 12662 lbs
Main belt, 14.0 inches; ends unarmored
Torpedo bulkhead, 1.0 inches
Armor deck, average 4.0 inches
C.T., 14.0 inches
Battery armor:
Main, 14.0" / secondary, 2.5"
AA, 1.0" shields / light guns, 1.0" shields
Maximum speed for 102774 shp = 28.00 knots
Approximate cruising radius, 15000 nm / 15 kts
Typical complement: 1288-1674
Estimated cost, $40.818 million (£10.204 million)
Remarks:
Relative extent of belt armor, 85 percent of 'typical' coverage.
Ship has slow, easy roll; a good, steady gun platform.
Magazines and engineering spaces are roomy, with superior
watertight subdivision.
Ship is roomy, with superior accommodation and working space.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 1583 tons = 4 pct
Armor, total ..................... 10804 tons = 31 pct
Belt 2973 tons = 8 pct
Torpedo bulkhead 563 tons = 2 pct
Deck 3712 tons = 11 pct
C.T. 326 tons = 1 pct
Armament 3230 tons = 9 pct
Machinery ........................ 3244 tons = 9 pct
Hull and fittings; equipment ..... 13386 tons = 38 pct
Fuel, ammunition, stores ......... 6084 tons = 17 pct
Miscellaneous weights ............ 200 tons = 1 pct
-----
35301 tons = 100 pct
Estimated metacentric height, 5.2 ft
Displacement summary:
Light ship: 29216 tons
Standard displacement: 30978 tons
Normal service: 35301 tons
Full load: 38618 tons
Loading submergence 1433 tons/foot
+++++++++++++++++++++++++
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.05
Shellfire needed to sink: 38982 lbs = 29.7 x 13.8-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 5.3
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 71 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.59
Relative quality as a seaboat: 1.18
+++++++++++++++++++++++++
Hull form characteristics:
Block coefficient: 0.55
Sharpness coefficient: 0.37
Hull speed coefficient 'M' = 7.27
'Natural speed' for length = 27.9 knots
Power going to wave formation
at top speed: 47 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 83 percent
Relative accommodation and working space: 145 percent
Displacement factor: 118 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.00
(Structure weight per square
foot of hull surface: 186 lbs)
Relative longitudinal hull strength: 1.02
(for 19.5 ft average freeboard)
Relative composite hull strength: 1.00
+++++++++++++++++++++++++
[Machine-readable parameters: Spring Style v. 1.2.1]
780.00 x 96.00 x 30.00; 19.50 -- Dimensions
0.55 -- Block coefficient
1927 -- Year laid down
28.00 / 15000 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
200 tons -- Miscellaneous weights
++++++++++
9 x 13.80; 3; 1 -- Main battery; turrets; superfiring
:
14 x 4.90; 7 -- Secondary battery; turrets
:
8 x 1.40 -- Tertiary (QF/AA) battery
Gun-shields
:
8 x 0.60 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
14.00 / 0.00 / 0.00 / 1.00; 85 -- Belt armor; relative extent
4.00 / 14.00 -- Deck / CT
14.00 / 2.50 / 1.00 / 1.00 -- Battery armor
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
IBB27, version 6, laid down 1927
Length, 713 ft x Beam, 104.0 ft x Depth, 29.0 ft
33792 tons normal displacement (30974 tons standard)
Main battery: 8 x 14.5-inch (2 x 4)
Secondary battery: 16 x 4.9-inch (8 x 2)
AA battery: 12 x 1.4-inch
Light battery: 12 x 0.6-inch
Weight of broadside: 13153 lbs
Main belt, 14.0 inches; ends unarmored
Torpedo bulkhead, 1.0 inches
Armor deck, average 4.5 inches
C.T., 14.0 inches
Battery armor:
Main, 14.0" / secondary, 3.0"
AA, 1.0" shields / light guns, 1.0" shields
Maximum speed for 105316 shp = 28.00 knots
Approximate cruising radius, 10000 nm / 15 kts
Typical complement: 1246-1620
Estimated cost, $41.725 million (£10.431 million)
Remarks:
Relative extent of belt armor, 90 percent of 'typical' coverage.
Ship has slow, easy roll; a good, steady gun platform.
Ship is roomy, with superior accommodation and working space.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 1644 tons = 5 pct
Armor, total ..................... 10504 tons = 31 pct
Belt 3059 tons = 9 pct
Torpedo bulkhead 497 tons = 1 pct
Deck 4136 tons = 12 pct
C.T. 317 tons = 1 pct
Armament 2495 tons = 7 pct
Machinery ........................ 3324 tons = 10 pct
Hull and fittings; equipment ..... 13529 tons = 40 pct
Fuel, ammunition, stores ......... 4590 tons = 14 pct
Miscellaneous weights ............ 200 tons = 1 pct
-----
33792 tons = 100 pct
Estimated metacentric height, 6.7 ft
Displacement summary:
Light ship: 29202 tons
Standard displacement: 30974 tons
Normal service: 33792 tons
Full load: 35912 tons
Loading submergence 1419 tons/foot
+++++++++++++++++++++++++
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.13
Shellfire needed to sink: 38142 lbs = 25.0 x 14.5-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 5.3
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 70 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.48
Relative quality as a seaboat: 1.13
+++++++++++++++++++++++++
Hull form characteristics:
Block coefficient: 0.55
Sharpness coefficient: 0.39
Hull speed coefficient 'M' = 6.75
'Natural speed' for length = 26.7 knots
Power going to wave formation
at top speed: 51 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 88 percent
Relative accommodation and working space: 156 percent
Displacement factor: 112 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.00
(Structure weight per square
foot of hull surface: 196 lbs)
Relative longitudinal hull strength: 1.35
(for 20.5 ft average freeboard;
freeboard adjustment +1.2 ft)
Relative composite hull strength: 1.03
+++++++++++++++++++++++++
[Machine-readable parameters: Spring Style v. 1.2.1]
713.00 x 104.00 x 29.00; 20.50 -- Dimensions
0.55 -- Block coefficient
1927 -- Year laid down
28.00 / 10000 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
200 tons -- Miscellaneous weights
++++++++++
8 x 14.50; 2; 0 -- Main battery; turrets; superfiring
:
16 x 4.90; 8 -- Secondary battery; turrets
:
12 x 1.40 -- Tertiary (QF/AA) battery
Gun-shields
:
12 x 0.60 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
14.00 / 0.00 / 0.00 / 1.00; 90 -- Belt armor; relative extent
4.50 / 14.00 -- Deck / CT
14.00 / 3.00 / 1.00 / 1.00 -- Battery armor
+++++++++++++++++++++++++++++++++++++++++++++++++++++++