In order to give Brock some
bad good ideas when it comes to the miscellaneous weights breakdown...
When I originally designed her about a year ago, the Ishinagenjo was slightly shorter and lighter than Brock's Terrible. Then back in May, I came with the *ahem* 'brilliant' idea to make the design a bit more like the OTL Shinano though a bit different for it being a purpose built design rather than a conversion and based on the Wesworld Yamato instead of the OTL Yamato. Of course that made her quite a bit bigger (and more expensive) than the original design (about 12% bigger) though it does carry significantly more miscellaneous weights than the first design (about 48% more). Also the notes below became a bit more complex with the addition of using miscellaneous weights to sim armor on the ship. But I guess you guys are a bit used to me making things a bit bigger, whether it is a destroyer, a submarine, a battleship or a carrier.
One thing I noticed was that adding armor does not alter space below waterline and survivability but the miscellaneous weights do meaning that those values are no longer correct when you use miscellaneous weights to sim armor. It is quite odd that stability-wise miscellaneous weights act as something located somewhere high in a ship's superstructure but volume-wise it affects the vessel's space below the waterline (and that is ignoring the fact that part of the miscellaneous weights of a carrier sim is actually there to
create extra space).
Ishinagenjo, Japan Carrier laid down 1948
Displacement:
72,345 t light; 74,503 t standard; 85,784 t normal; 94,810 t full load
Dimensions: Length overall / water x beam x draught
1,013.50 ft / 940.00 ft x 124.00 ft (Bulges 134.00 ft) x 37.00 ft (normal load)
308.92 m / 286.51 m x 37.80 m (Bulges 40.84 m) x 11.28 m
Armament:
24 - 2.95" / 75.0 mm guns (12x2 guns), 12.00lbs / 5.44kg shells, 1948 Model
Automatic rapid fire guns in deck mounts with hoists
on side, evenly spread, all raised mounts
36 - 1.57" / 40.0 mm guns (6x6 guns), 2.00lbs / 0.91kg shells, 1948 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
128 - 0.98" / 25.0 mm guns (32x4 guns), 0.57lbs / 0.26kg shells, 1948 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
48 - 0.98" / 25.0 mm guns (12x4 guns), 0.00lbs / 0.00kg shells, 1948 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 433 lbs / 196 kg
Shells per gun, main battery: 1,440
336 - 4.7" / 120 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.50" / 114 mm 665.00 ft / 202.69 m 12.00 ft / 3.66 m
Ends: Unarmoured
Upper: 2.00" / 51 mm 665.00 ft / 202.69 m 27.00 ft / 8.23 m
Main Belt covers 109 % of normal length
- Torpedo Bulkhead and Bulges:
3.75" / 95 mm 665.00 ft / 202.69 m 37.00 ft / 11.28 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - 1.00" / 25 mm
2nd: 1.00" / 25 mm - -
3rd: 1.00" / 25 mm - -
- Armour deck: 1.68" / 43 mm, Conning tower: 2.75" / 70 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 201,634 shp / 150,419 Kw = 30.00 kts
Range 20,000nm at 18.00 kts
Bunker at max displacement = 20,307 tons
Complement:
2,506 - 3,258
Cost:
£24.429 million / $97.715 million
Distribution of weights at normal displacement:
Armament: 66 tons, 0.1 %
Armour: 9,510 tons, 11.1 %
- Belts: 3,043 tons, 3.5 %
- Torpedo bulkhead: 3,414 tons, 4.0 %
- Armament: 52 tons, 0.1 %
- Armour Deck: 2,887 tons, 3.4 %
- Conning Tower: 115 tons, 0.1 %
Machinery: 4,928 tons, 5.7 %
Hull, fittings & equipment: 20,891 tons, 24.4 %
Fuel, ammunition & stores: 13,440 tons, 15.7 %
Miscellaneous weights: 36,950 tons, 43.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
123,551 lbs / 56,042 Kg = 9,598.3 x 3.0 " / 75 mm shells or 22.7 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 8.2 ft / 2.5 m
Roll period: 19.7 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.81
Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.644
Length to Beam Ratio: 7.01 : 1
'Natural speed' for length: 35.46 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 39
Bow angle (Positive = bow angles forward): 40.92 degrees
Stern overhang: 21.50 ft / 6.55 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 60.00 ft / 18.29 m
- Forecastle (25 %): 60.00 ft / 18.29 m (28.00 ft / 8.53 m aft of break)
- Mid (50 %): 28.00 ft / 8.53 m
- Quarterdeck (15 %): 28.00 ft / 8.53 m
- Stern: 28.00 ft / 8.53 m
- Average freeboard: 36.00 ft / 10.97 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 80.3 %
- Above water (accommodation/working, high = better): 177.4 %
Waterplane Area: 92,654 Square feet or 8,608 Square metres
Displacement factor (Displacement / loading): 151 %
Structure weight / hull surface area: 156 lbs/sq ft or 760 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.25
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
12x4 25mm mounts (4th gun) simmed for AA Rocket launcher mount.
12cm Rockets simmed as Torpedoes.
75mm => 1500 rpg = 240 tons
40mm => 2000 rpg = 80 tons
25mm => 3000 rpg = 122 tons
Total magazine weight: 442 tons = 1440 rounds
Actual range: 17500 nm @ 18 knots (= max 17803 tons bunker).
1234 tons of bunker fuel for simming extra aviation fuel (= 1,607,522 liters @ 0.78kg/l).
Baseline aviation fuel = 883,263 liters (part of the misc for planes). (*)
Total aviation fuel in tanks = 2,490,785 liters
1200 tons of bunker fuel for simming extra aircraft ammunition.
3.5" armored flight deck over the hangar (5424 tons miscellaneous weights) (**)
2" remainder of armored flight deck (3431 tons miscellaneous weights) (***)
1.75-2.5" hangar deck (4489 tons miscellaneous weights) (****)
1.25-1.75" protective deck (= deck armor) (*****)
940x33 2" Hangar deck side armor (2295 tons miscellaneous weights) (******)
Upper belt connected to the bottom of the hangar deck side armor.
TBH - Bulge: 0.75", Outer bulkhead: 0.7", Middle bulkhead: 0.4", Inner bulkhead: 0.4", Holding bulkhead: 1.5".
Correct survivability: 174,560 lbs / 79,179 Kg = 13,561.0 x 3.0 " / 75 mm shells or 41.8 torpedoes (*******)
Correct space - hull below water (magazines/engines, low = better): 56.8 % (*******)
- 11025 tons for 70 aircraft (157.5 tons per aircraft).
- 13610 tons for armored decks located much higher in the ship than the baseline deck armor.
- 2295 tons for hangar side armor located higher in the ship than the baseline side armor.
- 750 tons for 20 spare planes in crates (37.5 tons per aircraft).
- 560 tons for spare parts (8 tons per operational aircraft).
- 460 tons for repair shop (6 tons per operational aircraft, 2 ton per spare aircraft).
- 750 tons for steam catapults (250 tons per catapult, 2 bow and 1 port side).
- 300 tons for jet blast deflectors+deck cooling (100 tons per set, 2 bow and 1 port side)
- 1300 tons for flight deck port overhang and support.
- 700 tons for flight deck starboard overhang and support.
- 300 tons for elevators.
- 100 tons for landing aid system.
- 280 tons for flight operations center (4 tons per operational aircraft).
- 140 tons for briefing room (2 ton per operational aircraft).
- 250 tons for flagship facilities.
- 100 tons for carrier command center.
- 350 tons for fire control and fire control center.
- 400 tons for radar systems and sonar.
- 4 tons for 4 paravanes (2 port, 2 starboard).
- 724 tons for damage control and fire suppression systems (1 ton per 100 tons light displacement).
- 181 tons emergency diesel generators (1 ton per 400 tons light displacement).
- 724 tons for air condition system (1 ton per 100 tons light displacement).
- 300 tons for enhanced fuel pumping capacity.
- 203 tons for degaussing coils (1 ton per 5 feet of length (oa)).
- 92 for mount improvements.
--- 48 tons for 75mm mounts.
--- 12 tons for 40mm mounts.
--- 32 tons for 25mm mounts.
- 75 tons for 12x28 12 cm AA Rocket launchers.
- 977 tons for crew comforts (kept short this time instead of the detailed stuff).
Total: 36950 tons.
(*) Based on wiki info on USS Essex's SCB-27 upgrade.
(**) Calculated using SS3. Based on a 134 ft wide ship and 700 ft long hangar.
(***) Rough estimate needed for the remaining flightdeck area not over the hangar.
(****) Calculated using SS3. Based on a 134 ft wide ship and 700 ft long hangar. Hangar floor 2.5", rest of ship's length 1.75".
(*****) Calculated using SS3. Forward 15% and aft 15% of the ship's length 1.25", center part 1.75". 1.68" average used in sim to get required weight.
(******) Calculated using SS3. Based on a 134 ft wide ship.
(*******) Based on sim with miscellaneous weight armor being simmed as actual armor and a 1.09 stability.