WesWorld

I was playing around with a variety of main gun layouts (6x1 5", 8x1 5", 4x1 15cm, 3x2 5") and at the last moment I decided to stick to the 4x2 5" layout of the previous class...

... and there you have the silly extras as well...

Ashida, Japan Light Cruiser laid down 1945

Displacement:
5,505 t light; 5,959 t standard; 6,948 t normal; 7,738 t full load

Dimensions: Length overall / water x beam x draught
559.02 ft / 540.00 ft x 49.50 ft x 19.00 ft (normal load)
170.39 m / 164.59 m x 15.09 m x 5.79 m

Armament:
8 - 5.00" / 127 mm guns (4x2 guns), 55.12lbs / 25.00kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 2.95" / 75.0 mm guns (6x2 guns), 12.00lbs / 5.44kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships, 4 raised mounts - superfiring
24 - 1.57" / 40.0 mm guns (4x6 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
32 - 0.98" / 25.0 mm guns (8x4 guns), 0.57lbs / 0.26kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
16 - 0.98" / 25.0 mm guns (4x4 guns), 0.00lbs / 0.00kg shells, 1945 Model (see below)
Anti-aircraft guns in deck mounts with hoists
on side, evenly spread, all raised mounts
Weight of broadside 651 lbs / 295 kg
Shells per gun, main battery: 758 (see below)
112 - 4.7" / 120 mm above water torpedoes (see below)

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.00" / 51 mm 370.00 ft / 112.78 m 9.00 ft / 2.74 m
Ends: Unarmoured
Main Belt covers 105% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.00" / 76 mm 1.00" / 25 mm 2.00" / 51 mm
2nd: 1.00" / 25 mm - 1.00" / 25 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -

- Armour deck: 0.75" / 19 mm, Conning tower: 2.75" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 63,514 shp / 47,382 Kw = 32.50 kts
Range 6,000nm at 20.00 kts
Bunker at max displacement = 1,779 tons

Complement:
379 - 494

Cost:
£3.503 million / $14.012 million

Distribution of weights at normal displacement:
Armament: 107 tons, 1.5%
Armour: 616 tons, 8.9%
- Belts: 273 tons, 3.9%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 70 tons, 1.0%
- Armour Deck: 252 tons, 3.6%
- Conning Tower: 22 tons, 0.3%
Machinery: 1,604 tons, 23.1%
Hull, fittings & equipment: 2,278 tons, 32.8%
Fuel, ammunition & stores: 1,443 tons, 20.8%
Miscellaneous weights: 900 tons, 13.0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,952 lbs / 3,153 Kg = 111.2 x 5.0 " / 127 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 2.1 ft / 0.7 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.32
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0.479
Length to Beam Ratio: 10.91 : 1
'Natural speed' for length: 26.41 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.75 ft / 8.46 m
- Forecastle (20%): 17.75 ft / 5.41 m
- Mid (50%): 17.75 ft / 5.41 m
- Quarterdeck (20%): 10.75 ft / 3.28 m (17.75 ft / 5.41 m before break)
- Stern: 10.75 ft / 3.28 m
- Average freeboard: 17.15 ft / 5.23 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 104.9%
- Above water (accommodation/working, high = better): 138.3%
Waterplane Area: 18,163 Square feet or 1,687 Square metres
Displacement factor (Displacement / loading): 125%
Structure weight / hull surface area: 75 lbs/sq ft or 368 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.87
- Longitudinal: 1.22
- Overall: 0.90
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

4x4 25mm mounts (5th gun) simmed for AA Rocket launcher mount.
12cm Rockets simmed as Torpedoes.

Actual rounds per gun:
5" guns: 500 rounds per gun
75mm guns: 1500 rounds per gun
40mm guns: 1800 rounds per gun
25mm guns: 2500 rounds per gun


25 tons for 4x28 12 cm AA rockets launchers
40 tons for 2x Active Sonar
10 tons for Hydrophones
20 tons for Air Search Radar
10 tons for Surface Search Radar
150 tons for Fire Control
8 tons for 4 Depth Charge Projectors
16 tons for 16 Depth Charge Throwers
4 tons for 2 Depth Charge Chutes
100 tons for 300 Type 2 Depth Charges or 100 Type 1 Depth Charges
60 tons for two Ika ASW mortars + ammunition
56 tons for damage control and fire suppression systems
15 tons for emergency diesel generators
56 tons for air condition system
112 tons for degauss coiling
60 tons for 5" loading, training and elevation systems
18 tons for 75mm loading, training and elevation systems
8 tons for 40mm loading, training and elevation systems
2 tons for 25mm loading, training and elevation systems
40 tons for sushi restaurant
30 tons for pachinko parlor
30 tons for karaoke facilities + Kobe Cola vending machines
30 tons for lounge (aft)

Nice, but I'd try to get composite strength up to 1.00

Quoted from "eltf177"

Nice, but I'd try to get composite strength up to 1.00

I find the design an attempt to cram a bit too much into a single hull, but I can't see any immediate fault in it. The composite hull strength is within the parameters set by our Gentleman's Rules (q.v.). Not really my cup of tea but then the IJN does have some unique doctrines to abide by.

Quoted

I find the design an attempt to cram a bit too much into a single hull

Maybe true Bruce, but compared to its similar sized predecessor, it does not have the 4x3 24" torpedo tubes and 36 torpedoes nor does it have a catapult and crane and floatplane. Those things take up quite a bit of space. So even if it is cramming a bit too much into/onto a single hull, it is less so than with the Kikuchi class.

Quoted

but I can't see any immediate fault in it

Well, the fault should be that the IJN is asking too much of a single design. Perhaps I should repeat that in this class with keeping the 24" torpedoes while just ditch the silly stuff. I have noticed that I made an error with the 75cm mounts as only two mounts should be superfiring like on the preceding class so I will need to correct that anyway.

Zafura Maru, Japan Replenishment/Support Vessel (read: "floating bomb") laid down 1945
Ships: 2. Zafura Maru and Zaria Maru

Displacement:
22,202 t light; 28,629 t standard; 62,316 t normal; 89,266 t full load (see below)

Dimensions: Length overall / water x beam x draught
852.19 ft / 835.00 ft x 106.00 ft x 37.00 ft (normal load)
259.75 m / 254.51 m x 32.31 m x 11.28 m

Armament:
8 - 2.95" / 75.0 mm guns (4x2 guns), 12.00lbs / 5.44kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side ends, evenly spread, all raised mounts - superfiring
12 - 1.57" / 40.0 mm guns (2x6 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, all raised mounts
24 - 1.57" / 40.0 mm guns (4x6 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 168 lbs / 76 kg
Shells per gun, main battery: 43,630 (see below)

Armour:
- 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 - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 145,000 shp / 108,170 Kw = 28.76 kts
Range 110,300nm at 15.00 kts (see below)
Bunker at max displacement = 60,637 tons (see below)

Complement:
1,971 - 2,563

Cost:
£9.051 million / $36.205 million

Distribution of weights at normal displacement:
Armament: 24 tons, 0.0%
Armour: 16 tons, 0.0%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 16 tons, 0.0%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 3,662 tons, 5.9%
Hull, fittings & equipment: 13,500 tons, 21.7%
Fuel, ammunition & stores: 40,114 tons, 64.4% (see below)
Miscellaneous weights: 5,000 tons, 8.0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
173,821 lbs / 78,844 Kg = 13,503.6 x 3.0 " / 75 mm shells or 10.6 torpedoes
Stability (Unstable if below 1.00): 1.56
Metacentric height 11.6 ft / 3.5 m
Roll period: 13.1 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.52

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
and transom stern
Block coefficient: 0.666
Length to Beam Ratio: 7.88 : 1
'Natural speed' for length: 33.04 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 67
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 33.50 ft / 10.21 m
- Forecastle (12%): 28.50 ft / 8.69 m (20.50 ft / 6.25 m aft of break)
- Mid (41%): 23.50 ft / 7.16 m
- Quarterdeck (25%): 28.50 ft / 8.69 m (20.50 ft / 6.25 m before break)
- Stern: 28.50 ft / 8.69 m
- Average freeboard: 24.63 ft / 7.51 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 38.5%
- Above water (accommodation/working, high = better): 152.7%
Waterplane Area: 71,803 Square feet or 6,671 Square metres
Displacement factor (Displacement / loading): 497%
Structure weight / hull surface area: 135 lbs/sq ft or 658 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.00
- 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


Actual range: 15,000 nm at 15 knots.
Actual bunker at max displacement: 8,731 tons.
Actual shells per gun, 75mm: 1,500.
Actual shells per gun, 40mm: 2,500.
Actual Fuel, ammunition & stores: 6,277 tons.
Actual Full Load displacement: 66,196 tons.
Actual magazine weight: 180 tons.
Max draft: 39.30 feet.
Complement: 41 officers and 726 enlisted.

- 5,000 tons ammunition cargo (simmed as additional shells per gun).
- 17,747 tons fuel cargo (simmed as bunker).
- 8,000 tons aviation fuel, aircraft ammunition, etc (simmed as bunker).
- 3,000 tons stores cargo (simmed as bunker).
- 90 tons for 6.4x8.4x1.7m swimming pool (simmed as bunker).

- 3000 tons for aircrafts and aircraft parts.
- 600 tons for handling gear, cranes and pumping equipment.
- 100 tons for operations control center.
- 30 tons for navigation radar.
- 20 tons for Air Search Radar
- 10 tons for Surface Search Radar
- 223 tons for damage control and fire suppression systems.
- 56 tons for emergency diesel generators.
- 223 tons for climate control system.
- 171 tons for degaussing coils.
- 50 tons for two helicopters.
- 80 tons for helicopter landing pad and handling equipment (aft).
- 200 tons for 100 marines.
- 40 tons for sushi restaurant
- 30 tons for pachinko parlor
- 30 tons for karaoke facilities + Kobe Cola vending machines
- 137 tons for crew comfort.

Total 5000 miscellaneous weights.

Mara Maru (1945), Japan Tanker converted to Guidance Ship laid down 1939

Displacement:
4,162 t light; 4,475 t standard; 11,277 t normal; 16,717 t full load

Dimensions: Length overall / water x beam x draught
471.37 ft / 460.00 ft x 60.00 ft x 26.00 ft (normal load)
143.67 m / 140.21 m x 18.29 m x 7.92 m

Armament:
4 - 2.95" / 75.0 mm guns (2x2 guns), 12.00lbs / 5.44kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts
12 - 1.57" / 40.0 mm guns (2x6 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, all raised mounts
16 - 0.98" / 25.0 mm guns (4x4 guns), 0.57lbs / 0.26kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 81 lbs / 37 kg
Shells per gun, main battery: 1,500

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - -
2nd: 1.00" / 25 mm - -
3rd: 1.00" / 25 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 7,289 shp / 5,438 Kw = 16.00 kts
Range 141,390nm at 10.00 kts
Bunker at max displacement = 12,242 tons

Complement:
546 - 711

Cost:
£1.065 million / $4.260 million

Distribution of weights at normal displacement:
Armament: 12 tons, 0.1%
Armour: 8 tons, 0.1%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 8 tons, 0.1%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 197 tons, 1.7%
Hull, fittings & equipment: 2,445 tons, 21.7%
Fuel, ammunition & stores: 7,115 tons, 63.1%
Miscellaneous weights: 1,500 tons, 13.3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
50,135 lbs / 22,741 Kg = 3,894.9 x 3.0 " / 75 mm shells or 8.9 torpedoes
Stability (Unstable if below 1.00): 1.49
Metacentric height 4.6 ft / 1.4 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.83

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 7.67 : 1
'Natural speed' for length: 21.45 kts
Power going to wave formation at top speed: 32 %
Trim (Max stability = 0, Max steadiness = 100): 38
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.00 ft / 7.01 m
- Forecastle (20%): 15.00 ft / 4.57 m
- Mid (50%): 15.00 ft / 4.57 m
- Quarterdeck (15%): 15.00 ft / 4.57 m
- Stern: 15.00 ft / 4.57 m
- Average freeboard: 15.64 ft / 4.77 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 23.4%
- Above water (accommodation/working, high = better): 97.8%
Waterplane Area: 18,681 Square feet or 1,736 Square metres
Displacement factor (Displacement / loading): 565%
Structure weight / hull surface area: 80 lbs/sq ft or 390 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.51
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Conversion cost: 25% = 1041 tons and 3.5 months.
Ships converted: Mara Maru and Maro Maru.

Shells per gun, 75mm: 1,500.
Shells per gun, 40mm: 2,500.
Shells per gun, 25mm: 3,000.
Actual range: 36,000 nm at 10 knots.
Actual bunker at max displacement: 3,193 tons.
Actual Fuel, ammunition & stores: 2,087 tons.
Actual Full Load displacement: 12,696 tons.
Max draft: 29.27 feet.

Fuel Cargo: 5028 tons (simmed as bunker).

- 600 tons for radar and communication systems.
- 400 tons for handling gear, cranes and pumping equipment.
- 42 tons for damage control and fire suppression systems.
- 11 tons for emergency diesel generators.
- 42 tons for climate control system.
- 95 tons for degaussing coils.
- 40 tons for sushi restaurant
- 30 tons for pachinko parlor
- 30 tons for karaoke facilities + Kobe Cola vending machines
- 210 tons for crew comfort.

Total 1500 miscellaneous weights.

I can find no immediate technical fault in the proposed design, but it certainly is not the sort of vessel I would construct. Not only does it find the type designation (i.e. floating bomb) it also is a basket holding far too many eggs. It does, however, follow the Japanese trend toward gigantism - no doubt about that.

I'm not clear on why you're quoting a different full load displacement than the sim says for the Atomic Maru class.

There's certain no doubt in my mind as to why all the Japanese cruisers are in the 5,000 t range these days...

Quoted

It does, however, follow the Japanese trend toward gigantism - no doubt about that.

Well, if it makes you feel you any better, it was slightly lighter before today... about 500 tons lighter...

I was actually thinking of trying to change it so the light tonnage would end up as 22,222 tons, but decided not to do that and just be satisfied with the 0.666 BC...

Originally (about 2 years ago) the idea was a single vessel to support both Hiyo carriers at once and which was to be laid down in 1943. In the end, I scrapped the idea, but today I changed my mind and decided to build it anyway and add the Nurikabe carriers as well as the Yamato and Oshima battleships to the list of ships to handle and added a second vessel to the class.

... and I even added a swimming pool to the design.


Hiyo class carrier
Ammunition: 498 tons
Max fuel: 8287 tons
Avgas: 3600 for 120 planes
Stores: 1325 tons

Nurikabe class carrier
Ammunition: 1113 tons
Max fuel: 8546 tons
Avgas: 3870 for 129 planes
Stores: 1476 tons


Yamato class battleship
Ammunition: 2599 tons + ?
Max fuel: 12705 tons
Avgas: 210 tons
Stores: 2145 tons

Oshima class battleship
Ammunition: 4969 tons
Max fuel: 12630 tons
Avgas: 60 tons
Stores: 2704 tons


Hiyo Maru cargo
Ammunition: 5000 tons
Fuel: 17747 tons
Avgas: 8000 tons
Stores: 3000 tons

The things I was looking at with the Zafura class vessels were:
- Ammunition enough to fully resupply one Oshima class battleship.
- Fuel enough to completely fill up two Nurikabe class carriers.
- Not sure about the avgas, so I just assumed 30 tons per plane. Should be able to completely refil the avgas supply of two Nurikabe class carriers.
- Stores enough to completely restock two Nurikabe class carriers.
- Roughly similar range as the above ships.
- A speed close to the speed of the above ships.

With the amount needed for fuel, ammunition, stores as well as the machinery to be able to get to almost 29 knots, that will result in a pretty big vessel. I could have changed the requirements for the ship and gone for a bunch of smaller vessels but I thought that a bigger vessel would be a bit more interesting.

Quoted

I'm not clear on why you're quoting a different full load displacement than the sim says for the Atomic Maru class.

I consider all cargo that the ship can carry to be present at normal displacement. Therefore the only weight added to the ship to get from normal displacement to full displacement should be the ship's own fuel for the 15000nm/15kts range (or 36000nm/10kts for the Mara Maru class) and not that of the 110300nm/15kts (or 141390nm/10kts for the Mara Maru class).

... and the reason I do that is that for 89266 tons, the draught at maximum displacement would be about 53 feet. When you look at the sim and look at the height of the sides, you'll see that that is 57.5 feet. Actually back when I originally simmed it, the draught at maximum displacement was greater than the height of the sides... so I guess that when fully loaded that particular design would have sunk no matter what SS says...

Quoted

There's certain no doubt in my mind as to why all the Japanese cruisers are in the 5,000 t range these days...

Actually they are not cruisers but detroyers...

It still makes no sense to me. Whether you consider all her cargo to be part of her normal displacement or full load, the full load is going to be the same either way.

In which case, there shouldn't be a difference of 20,000 tonnes between what SS says and what you say.

And what is a "Guidance Ship"?

Quoted

It still makes no sense to me. Whether you consider all her cargo to be part of her normal displacement or full load, the full load is going to be the same either way.

In which case, there shouldn't be a difference of 20,000 tonnes between what SS says and what you say.

Of course there is a difference and it is more than 23,000 tons...

Actual bunker (max): 8,731 tons
Cargo fuel, avgas, stores, pool: 28,837 tons
Total: 37,568 tons

Sim bunker (max): 60,637 tons
Gap: 23,069 tons
Difference between SS full load displacement and my given full load displacement: 23,070 tons.

So if all the cargo is part of the normal displacement and the Actual bunker (max) is 8,731 tons, what about that 23,069 tons? Well, that is based on a range of 110,300nm at 15 knots and not on a range of 15,000nm at 15 kts, which is the actual range of the ship.

Thinking about it a bit more as to why I do it, according to the springstyle notes we should be using miscellaneous weights (and not bunkerage) and all of that is always part of the normal displacement thus all the cargo is part of the normal displacement. Even with the altered approach of using bunkerage for cargo that has been adapted by us, all the cargo should still be considered to be part of the normal displacement. If I were to sim the ship according to the springstyle notes and change all the cargo into miscellaneous weight (and ignore the stability issue), the full load displacement of the ship is going to be around the adjusted displacement that I have given and nowhere near the displacement that SS is giving. So in the end, that 23,069 tons does not exist aboard the ship and the actual full load displacement is 66,196 tons and not the 89,266 tons that SS gives.

Quoted

And what is a "Guidance Ship"?

Well I was thinking a bit of the German night fighter direction vessel Togo when I simmed it, so "guidance" as in "guiding Japan's night fighters over sea". Also Japan is test firing rockets from Magejima so perhaps it is capable of tracking the rockets and report stuff to Magejima though I am not sure about the possibility that.

*wakes up and re-reads post*

BTW, here is a sim of how the Hiyo Maru should be simmed, using miscellaneous weights for the fuel, avgas and stores cargo and swimming pool. I was kinda surprised I could get the stability all the way up to 1.00 with the trim, considering that more than half the weight is floating above the main deck somewhere when using the miscellaneous weights...

Hiyo Maru, Japan Carrier Support Vessel laid down 1945

Displacement:
51,039 t light; 57,466 t standard; 62,316 t normal; 66,196 t full load

Dimensions: Length overall / water x beam x draught
852.19 ft / 835.00 ft x 106.00 ft x 37.00 ft (normal load)
259.75 m / 254.51 m x 32.31 m x 11.28 m

Armament:
8 - 2.95" / 75.0 mm guns (4x2 guns), 12.00lbs / 5.44kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side ends, evenly spread, all raised mounts - superfiring
12 - 1.57" / 40.0 mm guns (2x6 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, all raised mounts
24 - 1.57" / 40.0 mm guns (4x6 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 168 lbs / 76 kg
Shells per gun, main battery: 43,630

Armour:
- 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 - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 4 shafts, 145,000 shp / 108,170 Kw = 28.76 kts
Range 15,000nm at 15.00 kts
Bunker at max displacement = 8,731 tons

Complement:
1,971 - 2,563

Cost:
£16.025 million / $64.098 million

Distribution of weights at normal displacement:
Armament: 24 tons, 0.0%
Armour: 16 tons, 0.0%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 16 tons, 0.0%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 3,662 tons, 5.9%
Hull, fittings & equipment: 13,500 tons, 21.7%
Fuel, ammunition & stores: 11,277 tons, 18.1%
Miscellaneous weights: 33,837 tons, 54.3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
61,111 lbs / 27,719 Kg = 4,747.5 x 3.0 " / 75 mm shells or 3.9 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 5.5 ft / 1.7 m
Roll period: 19.0 seconds
Steadiness - As gun platform (Average = 50 %): 38 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
and transom stern
Block coefficient: 0.666
Length to Beam Ratio: 7.88 : 1
'Natural speed' for length: 33.04 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 29
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 33.50 ft / 10.21 m
- Forecastle (12%): 28.50 ft / 8.69 m (20.50 ft / 6.25 m aft of break)
- Mid (41%): 23.50 ft / 7.16 m
- Quarterdeck (25%): 28.50 ft / 8.69 m (20.50 ft / 6.25 m before break)
- Stern: 28.50 ft / 8.69 m
- Average freeboard: 24.63 ft / 7.51 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 87.8%
- Above water (accommodation/working, high = better): 152.7%
Waterplane Area: 71,803 Square feet or 6,671 Square metres
Displacement factor (Displacement / loading): 151%
Structure weight / hull surface area: 135 lbs/sq ft or 658 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.00
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

I will need to dig through a bunch of the SS files to find the ones for the refitted ships and check them, so starting with the simple stuff...

D-4, Pacifica Destroyer laid down 1945

Displacement:
1,660 t light; 1,756 t standard; 2,087 t normal; 2,351 t full load

Dimensions: Length overall / water x beam x draught
391.73 ft / 378.00 ft x 34.50 ft x 14.00 ft (normal load)
119.40 m / 115.21 m x 10.52 m x 4.27 m

Armament:
4 - 5.00" / 127 mm guns in single mounts, 55.12lbs / 25.00kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 1.57" / 40.0 mm guns (2x6 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
16 - 0.98" / 25.0 mm guns (4x4 guns), 0.57lbs / 0.26kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 254 lbs / 115 kg
Shells per gun, main battery: 350
8 - 24.0" / 610 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
2nd: 1.00" / 25 mm - -
3rd: 1.00" / 25 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 39,864 shp / 29,738 Kw = 34.00 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 596 tons

Complement:
153 - 200

Cost:
£1.524 million / $6.097 million

Distribution of weights at normal displacement:
Armament: 41 tons, 2.0%
Armour: 25 tons, 1.2%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 25 tons, 1.2%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 913 tons, 43.7%
Hull, fittings & equipment: 581 tons, 27.9%
Fuel, ammunition & stores: 427 tons, 20.5%
Miscellaneous weights: 100 tons, 4.8%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
626 lbs / 284 Kg = 10.0 x 5.0 " / 127 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.43
Seaboat quality (Average = 1.00): 1.03

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.96 : 1
'Natural speed' for length: 22.32 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.00 ft / 7.01 m
- Forecastle (20%): 14.25 ft / 4.34 m
- Mid (50%): 14.25 ft / 4.34 m
- Quarterdeck (15%): 14.25 ft / 4.34 m
- Stern: 14.25 ft / 4.34 m
- Average freeboard: 14.95 ft / 4.56 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 163.1%
- Above water (accommodation/working, high = better): 66.1%
Waterplane Area: 8,331 Square feet or 774 Square metres
Displacement factor (Displacement / loading): 85%
Structure weight / hull surface area: 35 lbs/sq ft or 171 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.65
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

Soryu is the same as the Hiryu, but has a slightly greater length overall.

Compared to the original sim, I removed 50 tons of miscellaneous weights and used it for the magazine so the usage of the 'Shells per gun, main battery' is similar to my other recent designs. Also the old guns and mounts are being replaced with current ones.

Hiryu, Japan Carrier laid down 1927 (1945 refit)

Displacement:
19,919 t light; 20,589 t standard; 22,685 t normal; 24,362 t full load

Dimensions: Length overall / water x beam x draught
726.38 ft / 720.00 ft x 72.00 ft (Bulges 82.00 ft) x 24.45 ft (normal load)
221.40 m / 219.46 m x 21.95 m (Bulges 24.99 m) x 7.45 m

Armament:
8 - 4.13" / 105 mm guns (4x2 guns), 34.00lbs / 15.42kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side ends, evenly spread, 2 raised mounts - superfiring
8 - 2.95" / 75.0 mm guns (4x2 guns), 12.00lbs / 5.44kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side ends, evenly spread
24 - 1.57" / 40.0 mm guns (4x6 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
24 - 0.98" / 25.0 mm guns (6x4 guns), 0.57lbs / 0.26kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 430 lbs / 195 kg
Shells per gun, main battery: 768

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 7.00" / 178 mm 600.00 ft / 182.88 m 11.00 ft / 3.35 m
Ends: Unarmoured
Main Belt covers 128% of normal length

- Torpedo Bulkhead and Bulges:
1.00" / 25 mm 582.00 ft / 177.39 m 22.44 ft / 6.84 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -

- Armour deck: 3.50" / 89 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 154,063 shp / 114,931 Kw = 34.30 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 3,773 tons

Complement:
923 - 1,201

Cost:
£5.210 million / $20.839 million

Distribution of weights at normal displacement:
Armament: 65 tons, 0.3%
Armour: 4,888 tons, 21.5%
- Belts: 1,857 tons, 8.2%
- Torpedo bulkhead: 483 tons, 2.1%
- Armament: 57 tons, 0.2%
- Armour Deck: 2,439 tons, 10.8%
- Conning Tower: 52 tons, 0.2%
Machinery: 4,863 tons, 21.4%
Hull, fittings & equipment: 6,553 tons, 28.9%
Fuel, ammunition & stores: 2,766 tons, 12.2%
Miscellaneous weights: 3,550 tons, 15.6%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
26,410 lbs / 11,980 Kg = 747.7 x 4.1 " / 105 mm shells or 3.6 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 3.6 ft / 1.1 m
Roll period: 18.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.03

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.550
Length to Beam Ratio: 8.78 : 1
'Natural speed' for length: 30.76 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 68
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.00 ft / 9.14 m
- Forecastle (20%): 21.35 ft / 6.51 m
- Mid (50%): 21.35 ft / 6.51 m
- Quarterdeck (15%): 21.35 ft / 6.51 m
- Stern: 21.35 ft / 6.51 m
- Average freeboard: 22.04 ft / 6.72 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 124.8%
- Above water (accommodation/working, high = better): 166.0%
Waterplane Area: 37,665 Square feet or 3,499 Square metres
Displacement factor (Displacement / loading): 121%
Structure weight / hull surface area: 111 lbs/sq ft or 544 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.01
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

Actual rounds per gun
105mm => 400 rpg = 60t
75mm => 1500 rpg =80t
40mm => 2000 rpg = 53t
25mm => 3000 rpg = 23t
Total magazine weight: 216 tons = 768 rounds

Miscellaneous weights (3550t)
- 2500 tons for 50 planes
- 150 tons for 6 spare planes
- 200 tons for spare parts
- 156 tons for repair shop
- 100 tons for radar systems
- 100 tons for flight operations center
- 50 tons for briefing room
- 50 tons for carrier command center
- 150 tons for firecontrol and fire control center
- 60 tons for mount improvements
--- 32 tons for 105mm mounts
--- 16 tons for 75mm mounts
--- 6 tons for 40mm mounts
--- 6 tons for 25mm mounts
- 34 tons for crew comfort

Shinyo (ex Chosen) gets a similar treatment as the Soryu/Hiryu in that the usage of the 'Shells per gun, main battery' is now similar to my other recent designs and the old guns and mounts are being replaced. While digging up the sim I had noticed that I had originally simmed the 105mm and 75mm as being in turrets on barbettes which is actually an error due to the change from springstyle to springsharp which I kept on using. They should have been in mounts with hoists.

Shinyo (ex Chosen), Japan Carrier laid down 1925 (1945 refit)

Displacement:
17,533 t light; 18,154 t standard; 20,240 t normal; 21,909 t full load

Dimensions: Length overall / water x beam x draught
706.38 ft / 700.00 ft x 80.00 ft x 23.00 ft (normal load)
215.30 m / 213.36 m x 24.38 m x 7.01 m

Armament:
8 - 4.13" / 105 mm guns (4x2 guns), 34.00lbs / 15.42kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side ends, evenly spread, 2 raised mounts - superfiring
8 - 2.95" / 75.0 mm guns (4x2 guns), 12.00lbs / 5.44kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side ends, evenly spread
24 - 1.57" / 40.0 mm guns (4x6 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
24 - 0.98" / 25.0 mm guns (6x4 guns), 0.57lbs / 0.26kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 430 lbs / 195 kg
Shells per gun, main battery: 768

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.00" / 102 mm 575.00 ft / 175.26 m 11.00 ft / 3.35 m
Ends: Unarmoured
Main Belt covers 126% of normal length

- Torpedo Bulkhead:
1.00" / 25 mm 575.00 ft / 175.26 m 21.50 ft / 6.55 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm
2nd: 1.00" / 25 mm - 1.00" / 25 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -

- Armour deck: 3.00" / 76 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 144,432 shp / 107,746 Kw = 33.00 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 3,754 tons

Complement:
847 - 1,102

Cost:
£4.336 million / $17.344 million

Distribution of weights at normal displacement:
Armament: 65 tons, 0.3%
Armour: 3,749 tons, 18.5%
- Belts: 1,027 tons, 5.1%
- Torpedo bulkhead: 457 tons, 2.3%
- Armament: 48 tons, 0.2%
- Armour Deck: 2,169 tons, 10.7%
- Conning Tower: 48 tons, 0.2%
Machinery: 4,689 tons, 23.2%
Hull, fittings & equipment: 6,130 tons, 30.3%
Fuel, ammunition & stores: 2,707 tons, 13.4%
Miscellaneous weights: 2,900 tons, 14.3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
24,321 lbs / 11,032 Kg = 688.6 x 4.1 " / 105 mm shells or 3.2 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 4.7 ft / 1.4 m
Roll period: 15.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.07

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 8.75 : 1
'Natural speed' for length: 26.46 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 66
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.00 ft / 9.14 m
- Forecastle (20%): 21.00 ft / 6.40 m
- Mid (50%): 20.00 ft / 6.10 m
- Quarterdeck (15%): 20.00 ft / 6.10 m
- Stern: 20.00 ft / 6.10 m
- Average freeboard: 21.07 ft / 6.42 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 126.2%
- Above water (accommodation/working, high = better): 177.8%
Waterplane Area: 39,082 Square feet or 3,631 Square metres
Displacement factor (Displacement / loading): 122%
Structure weight / hull surface area: 108 lbs/sq ft or 529 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.01
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

Space for 45 planes (2025 tons)

Actual rounds per gun
105mm => 400 rpg = 60t
75mm => 1500 rpg =80t
40mm => 2000 rpg = 53t
25mm => 3000 rpg = 23t
Total magazine weight: 216 tons = 768 rounds

Miscellaneous weights (2900t)
- 2025 tons for 45 planes
- 180 tons for spare parts
- 135 tons for repair shop
- 100 tons for radar systems
- 90 tons for flight operations center
- 45 tons for briefing room
- 50 tons for carrier command center
- 150 tons for firecontrol and fire control center
- 60 tons for mount improvements
--- 32 tons for 105mm mounts
--- 16 tons for 75mm mounts
--- 6 tons for 40mm mounts
--- 6 tons for 25mm mounts
- 65 tons for crew comfort

Small vessel... not really exciting...

RPB-1, Japan River Police Boat laid down 1928 (1945 refit)

Displacement:
142 t light; 149 t standard; 168 t normal; 183 t full load

Dimensions: Length overall / water x beam x draught
141.41 ft / 140.00 ft x 30.00 ft x 2.00 ft (normal load)
43.10 m / 42.67 m x 9.14 m x 0.61 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.00lbs / 5.44kg shells, 1945 Model
Dual purpose gun in deck mount
on centreline forward
8 - 0.98" / 25.0 mm guns (4x2 guns), 0.57lbs / 0.26kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 300

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm -
2nd: 1.00" / 25 mm - -

- Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 848 shp / 632 Kw = 15.00 kts
Range 2,800nm at 10.00 kts
Bunker at max displacement = 34 tons

Complement:
23 - 30

Cost:
£0.040 million / $0.159 million

Distribution of weights at normal displacement:
Armament: 2 tons, 1.2%
Armour: 6 tons, 3.5%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 4 tons, 2.4%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 2 tons, 1.2%
Machinery: 26 tons, 15.7%
Hull, fittings & equipment: 108 tons, 64.2%
Fuel, ammunition & stores: 26 tons, 15.3%
Miscellaneous weights: 0 tons, 0.0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
719 lbs / 326 Kg = 55.9 x 3.0 " / 75 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.30
Metacentric height 1.3 ft / 0.4 m
Roll period: 11.0 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 0.71

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.700
Length to Beam Ratio: 4.67 : 1
'Natural speed' for length: 11.83 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 72
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 8.00 ft / 2.44 m
- Forecastle (10%): 6.50 ft / 1.98 m
- Mid (50%): 6.50 ft / 1.98 m
- Quarterdeck (15%): 6.50 ft / 1.98 m
- Stern: 6.50 ft / 1.98 m
- Average freeboard: 6.56 ft / 2.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 63.0%
- Above water (accommodation/working, high = better): 181.2%
Waterplane Area: 3,366 Square feet or 313 Square metres
Displacement factor (Displacement / loading): 223%
Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 2.04
- Overall: 1.02
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Smaller vessel... even less exciting...

Edit: forgot to use the proper caliber for the crew's SMGs...

CCB, Japan Command Communication Boat laid down 1930 (1945 refit)

Displacement:
62 t light; 71 t standard; 74 t normal; 76 t full load

Dimensions: Length overall / water x beam x draught
59.85 ft / 56.00 ft x 17.50 ft x 3.42 ft (normal load)
18.24 m / 17.07 m x 5.33 m x 1.04 m

Armament:
1 - 1.57" / 40.0 mm guns in single mounts, 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns (1x2 guns), 0.57lbs / 0.26kg shells, 1945 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
2 - 0.52" / 13.2 mm guns in single mounts, 0.09lbs / 0.04kg shells, 1945 Model
Machine guns in deck mounts
on side, all aft, all raised mounts - superfiring
16 - 0.32" / 8.1 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1945 Model
Machine guns in deck mounts (= Type 2 SMGs for the crew)
on side, evenly spread
4 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.00kg shells, 1930 Model
Machine guns in deck mounts (= Detachable Type 2 LMGs)
on side, evenly spread
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 2,400

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0.80" / 20 mm 27.00 ft / 8.23 m 4.70 ft / 1.43 m
Ends: 0.80" / 20 mm 7.50 ft / 2.29 m 2.00 ft / 0.61 m
21.50 ft / 6.55 m Unarmoured ends
Upper: 0.80" / 20 mm 48.75 ft / 14.86 m 3.85 ft / 1.17 m
Main Belt covers 74% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm -
2nd: 2.00" / 51 mm 1.00" / 25 mm -
3rd: 2.00" / 51 mm 1.00" / 25 mm -

- Armour deck: 0.25" / 6 mm, Conning tower: 4.00" / 102 mm

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 55 shp / 41 Kw = 8.50 kts
Range 1,000nm at 8.50 kts
Bunker at max displacement = 5 tons

Complement:
12 - 16

Cost:
£0.011 million / $0.046 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.6%
Armour: 21 tons, 28.9%
- Belts: 12 tons, 16.9%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 3 tons, 4.4%
- Armour Deck: 4 tons, 5.5%
- Conning Tower: 2 tons, 2.1%
Machinery: 2 tons, 2.3%
Hull, fittings & equipment: 28 tons, 38.2%
Fuel, ammunition & stores: 12 tons, 16.5%
Miscellaneous weights: 10 tons, 13.6%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
235 lbs / 106 Kg = 120.2 x 1.6 " / 40 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 0.5 ft / 0.2 m
Roll period: 10.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 0.79

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.770
Length to Beam Ratio: 3.20 : 1
'Natural speed' for length: 9.23 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 64
Bow angle (Positive = bow angles forward): 45.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 3.85 ft / 1.17 m
- Forecastle (20%): 3.85 ft / 1.17 m
- Mid (50%): 3.85 ft / 1.17 m
- Quarterdeck (15%): 3.85 ft / 1.17 m
- Stern: 3.85 ft / 1.17 m
- Average freeboard: 3.85 ft / 1.17 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 39.3%
- Above water (accommodation/working, high = better): 53.4%
Waterplane Area: 873 Square feet or 81 Square metres
Displacement factor (Displacement / loading): 194%
Structure weight / hull surface area: 26 lbs/sq ft or 129 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.32
- Longitudinal: 5.28
- Overall: 1.51
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

A bit bigger... but does not do much for the excitement rating...

Seta (refit), Japan River Gunboat laid down 1928

Displacement:
236 t light; 250 t standard; 273 t normal; 291 t full load

Dimensions: Length overall / water x beam x draught
182.06 ft / 180.12 ft x 27.23 ft x 2.62 ft (normal load)
55.49 m / 54.90 m x 8.30 m x 0.80 m

Armament:
2 - 2.95" / 75.0 mm guns in single mounts, 12.00lbs / 5.44kg shells, 1945 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
4 - 0.98" / 25.0 mm guns in single mounts, 0.57lbs / 0.26kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread
Weight of broadside 26 lbs / 12 kg
Shells per gun, main battery: 550

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.00" / 25 mm 60.00 ft / 18.29 m 6.26 ft / 1.91 m
Ends: Unarmoured
Main Belt covers 51% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm -
2nd: 1.00" / 25 mm - -

- Armour deck: 0.50" / 13 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 1,000 shp / 746 Kw = 15.16 kts
Range 2,800nm at 10.00 kts
Bunker at max displacement = 41 tons

Complement:
33 - 43

Cost:
£0.059 million / $0.237 million

Distribution of weights at normal displacement:
Armament: 3 tons, 1.3%
Armour: 66 tons, 24.3%
- Belts: 20 tons, 7.2%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 6 tons, 2.3%
- Armour Deck: 38 tons, 13.8%
- Conning Tower: 3 tons, 1.0%
Machinery: 31 tons, 11.4%
Hull, fittings & equipment: 135 tons, 49.4%
Fuel, ammunition & stores: 37 tons, 13.6%
Miscellaneous weights: 0 tons, 0.0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,145 lbs / 520 Kg = 89.0 x 3.0 " / 75 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.52
Metacentric height 1.5 ft / 0.4 m
Roll period: 9.5 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 0.86

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.743
Length to Beam Ratio: 6.61 : 1
'Natural speed' for length: 13.42 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11.00 ft / 3.35 m
- Forecastle (10%): 10.00 ft / 3.05 m (5.70 ft / 1.74 m aft of break)
- Mid (50%): 5.70 ft / 1.74 m
- Quarterdeck (15%): 5.70 ft / 1.74 m
- Stern: 5.70 ft / 1.74 m
- Average freeboard: 6.17 ft / 1.88 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 50.5%
- Above water (accommodation/working, high = better): 134.3%
Waterplane Area: 4,081 Square feet or 379 Square metres
Displacement factor (Displacement / loading): 175%
Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.02
- Longitudinal: 1.00
- Overall: 1.01
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather