I was thinking about the Ise and Hyuga today at work. Unlike the Fuso and Yamashiro, they have not been modernized with a partial reconstruction...
... not yet anyway.
I thought that for fun I should go a bit OTL with them, remove the X and Y turrets and put a flight deck aft for rotary-wing aircraft.
Ise/Hyuga modification, Japan Senkan laid down 1914 (Engine 1949)
Displacement:
33,727 t light; 35,601 t standard; 39,435 t normal; 42,503 t full load
Dimensions: Length overall / water x beam x draught
717.96 ft / 710.00 ft x 97.00 ft (Bulges 108.00 ft) x 30.00 ft (normal load)
218.84 m / 216.41 m x 29.57 m (Bulges 32.92 m) x 9.14 m
Armament:
8 - 14.17" / 360 mm guns (4x2 guns), 1,400.00lbs / 635.03kg shells, 1946 Model
Breech loading guns in turrets (on barbettes)
on centreline, all forward, 2 raised mounts - superfiring
16 - 5.00" / 127 mm guns in single mounts, 55.12lbs / 25.00kg shells, 1946 Model
Quick firing guns in casemate mounts
on side, all forward
16 guns in hull casemates - Limited use in heavy seas
20 - 2.95" / 75.0 mm guns (10x2 guns), 12.00lbs / 5.44kg shells, 1946 Model
Automatic rapid fire guns in deck mounts with hoists
on side, evenly spread
36 - 1.57" / 40.0 mm guns (6x6 guns), 2.00lbs / 0.91kg shells, 1946 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
56 - 0.98" / 25.0 mm guns (14x4 guns), 0.57lbs / 0.26kg shells, 1946 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 12,426 lbs / 5,636 kg
Shells per gun, main battery: 153
168 - 4.7" / 120 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 14.0" / 356 mm 475.00 ft / 144.78 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 103 % of normal length
- Torpedo Bulkhead and Bulges:
2.00" / 51 mm 475.00 ft / 144.78 m 29.00 ft / 8.84 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 16.0" / 406 mm 10.0" / 254 mm 14.0" / 356 mm
2nd: 4.00" / 102 mm - 4.00" / 102 mm
3rd: 1.00" / 25 mm - 1.00" / 25 mm
4th: 1.00" / 25 mm 1.00" / 25 mm -
5th: 1.00" / 25 mm 1.00" / 25 mm -
- Armour deck: 5.50" / 140 mm, Conning tower: 18.00" / 457 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 65,359 shp / 48,758 Kw = 24.00 kts
Range 10,000nm at 18.00 kts
Bunker at max displacement = 6,902 tons
Complement:
1,398 - 1,818
Cost:
£3.494 million / $13.975 million
Distribution of weights at normal displacement:
Armament: 1,599 tons, 4.1 %
Armour: 13,232 tons, 33.6 %
- Belts: 3,421 tons, 8.7 %
- Torpedo bulkhead: 1,019 tons, 2.6 %
- Armament: 3,217 tons, 8.2 %
- Armour Deck: 5,125 tons, 13.0 %
- Conning Tower: 449 tons, 1.1 %
Machinery: 1,580 tons, 4.0 %
Hull, fittings & equipment: 12,466 tons, 31.6 %
Fuel, ammunition & stores: 5,708 tons, 14.5 %
Miscellaneous weights: 4,850 tons, 12.3 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
57,685 lbs / 26,165 Kg = 40.5 x 14.2 " / 360 mm shells or 11.0 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 5.7 ft / 1.7 m
Roll period: 19.0 seconds
Steadiness - As gun platform (Average = 50 %): 61 %
- Recoil effect (Restricted arc if above 1.00): 0.34
Seaboat quality (Average = 1.00): 1.23
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.600
Length to Beam Ratio: 6.57 : 1
'Natural speed' for length: 26.65 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.88 ft / 6.67 m
- Forecastle (20 %): 18.88 ft / 5.75 m
- Mid (73 %): 18.88 ft / 5.75 m (11.83 ft / 3.61 m aft of break)
- Quarterdeck (15 %): 11.83 ft / 3.61 m
- Stern: 11.83 ft / 3.61 m
- Average freeboard: 17.20 ft / 5.24 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.7 %
- Above water (accommodation/working, high = better): 110.2 %
Waterplane Area: 50,370 Square feet or 4,680 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 178 lbs/sq ft or 868 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.03
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily
Actual 25mm mounts: 8x4 (= 32 guns)
6x4 25mm mounts simmed for AA Rocket launcher mount.
12cm Rockets simmed as Torpedoes.
Actual shells per gun (1085t)
36cm = 100 rounds per gun (622 tons total)
5" = 310 rounds per gun (152 tons total)
75mm = 1500 rounds per gun (200 tons total)
40mm = 2000 rounds per gun (80 tons total)
25mm = 3000 rounds per gun (31 tons total)
4850t
- 719 tons for X and Y barbettes.
- 500 tons for 20 rotary-wing aircraft.
- 250 tons for 5 spare aircraft in crates.
- 160 tons for spare parts (8 tons per operational aircraft).
- 130 tons for repair shop (6 tons per operational aircraft, 2 ton per spare aircraft).
- 100 tons for elevators.
- 1000 tons for reinforced hangar and flight deck structure.
- 80 tons for flight operations center (4 tons per operational aircraft).
- 40 tons for briefing room (2 ton per operational aircraft).
- 50 tons for carrier command center.
- 200 tons for fire control and fire control center
- 200 tons for radar systems
- 338 tons for damage control and fire suppression systems
- 85 tons emergency diesel generators
- 338 tons for air condition system
- 144 tons for degaussing coils
- 38 tons for 6x28 12 cm AA Rocket launchers
- 60 for mount improvements
--- 40 tons for 75mm mounts
--- 12 tons for 40mm mounts
--- 8 tons for 25mm mounts
- 418 tons for for crew comfort.
Partial Reconstruction: 16864 tons and 21.5 months required.