WesWorld

... or not. :-)
This is a slightly altered version of one of the first attempts at creating something that was somewhat based on this ship.
Using the latest version of Springsharp, I made a few adjustments compared to that original sim.
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CB-64/65, Japan Large Cruiser laid down 1935

Displacement:
32,267 t light; 33,555 t standard; 36,182 t normal; 38,284 t full load

Dimensions: Length overall / water x beam x draught
873.63 ft / 850.00 ft x 89.00 ft x 31.00 ft (normal load)
266.28 m / 259.08 m x 27.13 m x 9.45 m

Armament:
9 - 12.20" / 310 mm guns (3x3 guns), 900.00lbs / 408.23kg shells, 1935 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
6 - 6.10" / 155 mm guns (2x3 guns), 115.00lbs / 52.16kg shells, 1935 Model
Quick firing guns in turrets (on barbettes)
on centreline ends, evenly spread, all raised mounts
16 - 3.94" / 100 mm guns (8x2 guns), 30.00lbs / 13.61kg shells, 1935 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 4 raised mounts - superfiring
20 - 1.97" / 50.0 mm guns (10x2 guns), 4.00lbs / 1.81kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
36 - 0.98" / 25.0 mm guns (12x3 guns), 0.57lbs / 0.26kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 9,371 lbs / 4,250 kg
Shells per gun, main battery: 105
12 - 24.0" / 609.6 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 11.0" / 278 mm 560.00 ft / 170.69 m 11.32 ft / 3.45 m
Ends: Unarmoured
Upper: 1.50" / 38 mm 560.00 ft / 170.69 m 12.00 ft / 3.66 m
Main Belt covers 101 % of normal length

- Torpedo Bulkhead:
1.00" / 25 mm 560.00 ft / 170.69 m 28.46 ft / 8.67 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 12.0" / 305 mm 9.00" / 229 mm 11.0" / 279 mm
2nd: 3.00" / 76 mm 1.00" / 25 mm 1.00" / 25 mm
3rd: 2.00" / 51 mm - -
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -

- Armour deck: 5.00" / 127 mm, Conning tower: 8.00" / 203 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 207,517 shp / 154,808 Kw = 35.00 kts
Range 10,000nm at 15.00 kts (Bunkerage = 4,730 tons)

Complement:
1,311 - 1,705

Cost:
£15.000 million / $59.998 million

Distribution of weights at normal displacement:
Armament: 1,181 tons, 3.3 %
Armour: 11,407 tons, 31.5 %
- Belts: 3,323 tons, 9.2 %
- Torpedo bulkhead: 590 tons, 1.6 %
- Armament: 2,270 tons, 6.3 %
- Armour Deck: 5,036 tons, 13.9 %
- Conning Tower: 189 tons, 0.5 %
Machinery: 5,895 tons, 16.3 %
Hull, fittings & equipment: 13,684 tons, 37.8 %
Fuel, ammunition & stores: 3,915 tons, 10.8 %
Miscellaneous weights: 100 tons, 0.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
37,031 lbs / 16,797 Kg = 40.7 x 12.2 " / 310 mm shells or 4.0 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 5.1 ft / 1.5 m
Roll period: 16.6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.59
Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.540
Length to Beam Ratio: 9.55 : 1
'Natural speed' for length: 33.24 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 4.00 ft / 1.22 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 34.00 ft / 10.36 m
- Forecastle (20 %): 23.00 ft / 7.01 m
- Mid (50 %): 23.00 ft / 7.01 m
- Quarterdeck (15 %): 23.00 ft / 7.01 m
- Stern: 23.00 ft / 7.01 m
- Average freeboard: 23.88 ft / 7.28 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 101.0 %
- Above water (accommodation/working, high = better): 156.0 %
Waterplane Area: 54,440 Square feet or 5,058 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 170 lbs/sq ft or 828 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.09
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Belt 10 inch + 0.3 inch steel plate backing, angled at 20 degrees

Atatake, Japan Monitor laid down 1924

Displacement:
7,594 t light; 7,991 t standard; 8,919 t normal; 9,627 t full load

Dimensions: Length overall / water x beam x draught
447.04 ft / 440.00 ft x 60.00 ft x 21.50 ft (normal load)
136.26 m / 134.11 m x 18.29 m x 6.55 m

Armament:
4 - 11.02" / 280 mm guns (2x2 guns), 670.00lbs / 303.91kg shells, 1924 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
4 - 5.91" / 150 mm guns (2x2 guns), 105.00lbs / 47.63kg shells, 1921 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, all raised mounts
16 - 4.13" / 105 mm guns (8x2 guns), 35.00lbs / 15.88kg shells, 1921 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships, 4 raised mounts - superfiring
8 - 1.97" / 50.0 mm guns (4x2 guns), 4.00lbs / 1.81kg shells, 1918 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
18 - 0.98" / 25.0 mm guns (6x3 guns), 0.57lbs / 0.26kg shells, 1918 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
Weight of broadside 3,702 lbs / 1,679 kg
Shells per gun, main battery: 100

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 13.7" / 348 mm 166.00 ft / 50.60 m 9.30 ft / 2.83 m
Ends: Unarmoured
Upper: 1.50" / 38 mm 166.00 ft / 50.60 m 11.00 ft / 3.35 m
Main Belt covers 58 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 10.0" / 254 mm 8.00" / 203 mm 10.0" / 254 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -

- Armour deck: 4.00" / 102 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 14,529 shp / 10,839 Kw = 20.00 kts
Range 7,200nm at 15.00 kts (Bunkerage = 1,672 tons)

Complement:
458 - 596

Cost:
£2.228 million / $8.912 million

Distribution of weights at normal displacement:
Armament: 462 tons, 5.2 %
Armour: 3,300 tons, 37.0 %
- Belts: 1,169 tons, 13.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 781 tons, 8.8 %
- Armour Deck: 1,322 tons, 14.8 %
- Conning Tower: 28 tons, 0.3 %
Machinery: 479 tons, 5.4 %
Hull, fittings & equipment: 3,303 tons, 37.0 %
Fuel, ammunition & stores: 1,326 tons, 14.9 %
Miscellaneous weights: 50 tons, 0.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,407 lbs / 6,535 Kg = 21.5 x 11.0 " / 280 mm shells or 2.7 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 2.6 ft / 0.8 m
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.84
Seaboat quality (Average = 1.00): 1.52

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 7.33 : 1
'Natural speed' for length: 20.98 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 46
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.00 ft / 5.79 m
- Forecastle (20 %): 15.00 ft / 4.57 m
- Mid (50 %): 14.00 ft / 4.27 m
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 14.67 ft / 4.47 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 57.8 %
- Above water (accommodation/working, high = better): 105.8 %
Waterplane Area: 17,869 Square feet or 1,660 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 121 lbs/sq ft or 589 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.81
- 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

Belt is 13.14 inch + 0.36 inch steel plate backing angled at 10 degrees

I like the CB-64/65. But I'm afraid I'm about to open another can of worms here: Assuming that on 31/12/34 someone 'gives notice', so that the Treaty expires 31/12/36, can you go ahead and lay down 'Treaty-busting' ships as long as they are completed no sooner than 1/1/37?

Nice monitor too, BTW.

Oh, one more thing - how do the 50mm AA guns compare to the typical 40mm Bofors?

Well, the actual design I made was for 1939, so I slightly altered the date to 1935 without thinking of the CT. I have actually another beasty which I need to work on (the end result of adjusting the CB64/65 design over and over and over and over and over again).
The Monitor is (if I am not mistaken) currently under construction. However now I can actually sim her with all five weapon types.
And how the 50mm compares to the 40mm Bofors? No idea. As far as I know, that thing does not exist yet. Actually I am slowly adding the British 2pdr mark VIII to my arsenal. The 40mm Bofors I have planned for the fourties if we ever get there.

ICN Dairen, "Japan" Battle Cruiser laid down 1925

Displacement:
29,457 t light; 30,621 t standard; 33,176 t normal; 35,087 t full load

Dimensions: Length overall / water x beam x draught
817.01 ft / 800.00 ft x 80.00 ft (Bulges 91.00 ft) x 29.00 ft (normal load)
249.03 m / 243.84 m x 24.38 m (Bulges 27.74 m) x 8.84 m

Armament:
9 - 12.00" / 305 mm guns (3x3 guns), 925.00lbs / 419.57kg shells, 1924 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
6 - 5.91" / 150 mm guns (2x3 guns), 103.62lbs / 47.00kg shells, 1921 Model
Quick firing guns in turrets (on barbettes)
on centreline ends, evenly spread, all raised mounts
20 - 4.13" / 105 mm guns (10x2 guns), 35.27lbs / 16.00kg shells, 1924 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 6 raised mounts - superfiring
16 - 1.57" / 40.0 mm guns (10 mounts), 2.00lbs / 0.91kg shells, 1923 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 8 raised mounts
30 - 0.98" / 25.0 mm guns (18 mounts), 0.57lbs / 0.26kg shells, 1918 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 14 raised mounts
Weight of broadside 9,701 lbs / 4,400 kg
Shells per gun, main battery: 90

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 8.12" / 206 mm 660.00 ft / 201.17 m 11.00 ft / 3.35 m
Ends: Unarmoured
Upper: 1.50" / 38 mm 660.00 ft / 201.17 m 12.00 ft / 3.66 m
Main Belt covers 127 % of normal length

- Torpedo Bulkhead and Bulges:
1.00" / 25 mm 660.00 ft / 201.17 m 27.00 ft / 8.23 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 9.00" / 229 mm 6.00" / 152 mm 8.00" / 203 mm
2nd: 3.00" / 76 mm 2.00" / 51 mm 2.00" / 51 mm
3rd: 2.00" / 51 mm - -
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -

- Armour deck: 4.00" / 102 mm, Conning tower: 8.00" / 203 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 208,649 shp / 155,652 Kw = 34.00 kts
Range 9,000nm at 15.00 kts (Bunkerage = 4,599 tons)

Complement:
1,228 - 1,597

Cost:
£9.621 million / $38.483 million

Distribution of weights at normal displacement:
Armament: 1,143 tons, 3.4 %
Armour: 8,713 tons, 26.3 %
- Belts: 2,852 tons, 8.6 %
- Torpedo bulkhead: 659 tons, 2.0 %
- Armament: 1,818 tons, 5.5 %
- Armour Deck: 3,206 tons, 9.7 %
- Conning Tower: 179 tons, 0.5 %
Machinery: 6,774 tons, 20.4 %
Hull, fittings & equipment: 12,626 tons, 38.1 %
Fuel, ammunition & stores: 3,719 tons, 11.2 %
Miscellaneous weights: 200 tons, 0.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
21,404 lbs / 9,708 Kg = 24.8 x 12.0 " / 305 mm shells or 2.6 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 5.7 ft / 1.7 m
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.60
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 8.79 : 1
'Natural speed' for length: 28.28 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 33.00 ft / 10.06 m
- Forecastle (20 %): 25.00 ft / 7.62 m
- Mid (50 %): 24.00 ft / 7.32 m
- Quarterdeck (15 %): 24.00 ft / 7.32 m
- Stern: 24.00 ft / 7.32 m
- Average freeboard: 24.99 ft / 7.62 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 125.9 %
- Above water (accommodation/working, high = better): 162.8 %
Waterplane Area: 43,318 Square feet or 4,024 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 174 lbs/sq ft or 848 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.15
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

Belt is 8 inch inclined at 10 degrees.

Quoted

And how the 50mm compares to the 40mm Bofors? No idea. As far as I know, that thing does not exist yet. Actually I am slowly adding the British 2pdr mark VIII to my arsenal. The 40mm Bofors I have planned for the fourties if we ever get there.

Quite true, I've noticed how many people seem to be using a gun that doesn't exist yet.

I can think of 37mm and 47mm calibre guns of this period, but no 40mm. Closest is the British 2pdr afforementioned.

Here is a great site for guns and ammunition.

http://www.quarry.nildram.co.uk/

"Quite true, I've noticed how many people seem to be using a gun that doesn't exist yet."

Which ones? I suppose one could argue that their navy invented the gun, but yes reason does have to step in from time to time to burst our bubble!

The RSAN knew 55mm guns as their smallest until the end of WW1. Those were old school center pivot guns and not used for AAA. The 88mm guns of german origin were the first to be used as AAA.

When we reached the 1920s I thought a 20mm gun - automatic, but slow ROF and prone to jammng - would be nice to have. It can hardly be compared to WW2-type Oerlikons but I don´t see why a 20mm gun should be unrealistic.

I also introduced a 40mm gun to my navy. I wanted something larger than 20mm that could also act as some kind of secondary on small units with main armament of 88, 105 or 127mm. Those 40mm guns are all semi-automatic, have a low ROF and are also prone to jamming. They can be best compared to the historical german 37mm but are probably even less useful. I could have choosen the 37mm caliber but I don´t like it. Being metric I prefered to double the smaller caliber - I don´t know why the Germans ever choosed 37mm anyway. Doesn´t make much sense to me, though.

I could have gone for a different caliber but choosing 40mm now will not force me to re-design my ships once Bofors or similar guns are available. So call me lazy but that´s probably the most important motivation to go for 40mm. :o)

Quoted

When we reached the 1920s I thought a 20mm gun - automatic, but slow ROF and prone to jammng - would be nice to have. It can hardly be compared to WW2-type Oerlikons but I don´t see why a 20mm gun should be unrealistic.

See the article on the Oerlikon FFL on the afforementioned site. There is even a picture!

So I guess we can assume the RSAN to use a modified 20mm Becker cannon.

Thanks for the hint.

Erm well count me among the guilty partys who put 40mm guns on his 1915 cruiser. Just call 'em "2-pounders" I guess.

Well Swamphen mentioned this to me (via PM), and I did notice it...
... but why don't I get completed data for the third battery's armor? In all three cases, the "Other gunhouse" bit and "Barbette/hoist"bit do not show up in the report, despite the fact that I did enter armor in those two spots.
BTW too lazy to look at the Warships1 board to see if someone posted something similar there.

Heres an interesting paragragh I found on that site..

From the nineteenth century up to the end of the Second World War, 37mm was a common calibre in military service. This occurred because an international agreement, the Declaration of St Petersburg in 1868, banned explosive shells weighing less than 400 grams (just under one pound), for which 37mm was then the appropriate minimum calibre. The 37mm calibre remained popular long after its original rationale disappeared (the Declaration was effectively abandoned during WW1) and was extensively used by most combatants in both worlds wars in a wide range of weapons including tank, anti-tank, automatic anti-aircraft and aircraft-mounted guns. Even today, 37mm AA guns are still made in China by NORINCO.

Seems like my 25mm fits into the timeline nicely being introduced durring WW1

Quoted

Erm well count me among the guilty partys who put 40mm guns on his 1915 cruiser. Just call 'em "2-pounders" I guess.

Perhaps you use the British Vickers 2-pdr Mark II.

Quoted

This occurred because an international agreement, the Declaration of St Petersburg in 1868, banned explosive shells weighing less than 400 grams (just under one pound), for which 37mm was then the appropriate minimum calibre.

Well, I guess Japan was too busy with its own problems to have noticed any such agreement. ;-)