IJN, Post-GMI

[Tanthalas]

The 6 gun move might be a good idea... I started drawing mine today and discovered I am going to have to do a bit of Fancy arranging to make all 7 fit on that hull (might have to kick another one SF).  I had forgotten how much working room a 6" gun took vs the 4" I was working with previously.

[Logi]

Without increasing ship length (and thereby forcing it to be constructed in Type 2 docks), I can increase tonnage slightly for increased range and armor.

Deck: 30mm -> 40mm
Endurance: 3000nm -> 4500nm

Tenryuu Scheme F, Japanese Light Cruiser laid down 1905

Displacement:
   3,200 t light; 3,328 t standard; 3,716 t normal; 4,026 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.70 ft / 393.70 ft) x 39.04 ft x (16.90 / 17.96 ft)
   (120.00 m / 120.00 m) x 11.90 m  x (5.15 / 5.47 m)

Armament:
      6 - 5.98" / 152 mm 45.0 cal guns - 108.07lbs / 49.02kg shells, 150 per gun
     Quick firing guns in deck and hoist mounts, 1905 Model
     5 x Single mounts on centreline ends, majority aft
      2 raised mounts - superfiring
     1 x Single mount on centreline, aft deck forward
      Weight of broadside 648 lbs / 294 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.39" / 10 mm      0.39" / 10 mm

   - Protected deck - single deck:
   For and Aft decks: 1.57" / 40 mm
   Forecastle: 1.57" / 40 mm  Quarter deck: 1.57" / 40 mm

   - Conning towers: Forward 0.79" / 20 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 20,000 shp / 14,920 Kw = 25.00 kts
   Range 4,500nm at 10.00 kts
   Bunker at max displacement = 699 tons (90% coal)

Complement:
   237 - 309

Cost:
   £0.397 million / $1.587 million

Distribution of weights at normal displacement:
   Armament: 172 tons, 4.6 %
      - Guns: 172 tons, 4.6 %
   Armour: 327 tons, 8.8 %
      - Armament: 22 tons, 0.6 %
      - Armour Deck: 301 tons, 8.1 %
      - Conning Tower: 4 tons, 0.1 %
   Machinery: 1,596 tons, 42.9 %
   Hull, fittings & equipment: 1,080 tons, 29.1 %
   Fuel, ammunition & stores: 516 tons, 13.9 %
   Miscellaneous weights: 25 tons, 0.7 %
      - On freeboard deck: 25 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,588 lbs / 720 Kg = 14.8 x 6.0 " / 152 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 13.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 75 %
         - Recoil effect (Restricted arc if above 1.00): 0.66
   Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.501 / 0.511
   Length to Beam Ratio: 10.08 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 72
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  13.78 ft / 4.20 m,  12.14 ft / 3.70 m
      - Forward deck:   30.00 %,  12.14 ft / 3.70 m,  11.48 ft / 3.50 m
      - Aft deck:   35.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  10.83 ft / 3.30 m
      - Average freeboard:      11.79 ft / 3.60 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 154.1 %
      - Above water (accommodation/working, high = better): 95.8 %
   Waterplane Area: 10,249 Square feet or 952 Square metres
   Displacement factor (Displacement / loading): 88 %
   Structure weight / hull surface area: 69 lbs/sq ft or 335 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.29
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Misc Weight: 25t - Long Range Wireless

[Logi]

I've moved the cruiser rules discussion to another thread, feel free to keep brainstorming there. Tonnage hiked again in exchange for an armored belt & deck and slightly increased endurance. Speed was reduced by a half knot.

Displacement: 3,200t -> 3,600t
Belt: 0mm -> 105mm @ 2m
Deck: 30mm Protected -> 25mm Armored
Endurance: 4500nm -> 5000nm
Speed: 25kn -> 24.48kn

Tenryuu Scheme G, Japanese Light Cruiser laid down 1905

Displacement:
   3,600 t light; 3,738 t standard; 4,198 t normal; 4,566 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.70 ft / 393.70 ft) x 40.35 ft x (18.04 / 19.25 ft)
   (120.00 m / 120.00 m) x 12.30 m  x (5.50 / 5.87 m)

Armament:
      6 - 5.98" / 152 mm 45.0 cal guns - 108.07lbs / 49.02kg shells, 150 per gun
     Quick firing guns in deck and hoist mounts, 1905 Model
     5 x Single mounts on centreline ends, majority aft
      2 raised mounts - superfiring
     1 x Single mount on centreline, aft deck forward
      Weight of broadside 648 lbs / 294 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.13" / 105 mm   393.70 ft / 120.00 m   6.56 ft / 2.00 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.39" / 10 mm      0.39" / 10 mm

   - Armoured deck - single deck:
   For and Aft decks: 0.98" / 25 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 2.76" / 70 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 20,000 shp / 14,920 Kw = 24.48 kts
   Range 5,000nm at 10.00 kts
   Bunker at max displacement = 829 tons (90% coal)

Complement:
   259 - 338

Cost:
   £0.415 million / $1.662 million

Distribution of weights at normal displacement:
   Armament: 172 tons, 4.1 %
      - Guns: 172 tons, 4.1 %
   Armour: 629 tons, 15.0 %
      - Belts: 395 tons, 9.4 %
      - Armament: 22 tons, 0.5 %
      - Armour Deck: 197 tons, 4.7 %
      - Conning Tower: 15 tons, 0.4 %
   Machinery: 1,630 tons, 38.8 %
   Hull, fittings & equipment: 1,144 tons, 27.2 %
   Fuel, ammunition & stores: 598 tons, 14.3 %
   Miscellaneous weights: 25 tons, 0.6 %
      - On freeboard deck: 25 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,110 lbs / 957 Kg = 19.7 x 6.0 " / 152 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.12
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 13.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 75 %
         - Recoil effect (Restricted arc if above 1.00): 0.58
   Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.513 / 0.523
   Length to Beam Ratio: 9.76 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 71
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  13.78 ft / 4.20 m,  12.14 ft / 3.70 m
      - Forward deck:   30.00 %,  12.14 ft / 3.70 m,  11.48 ft / 3.50 m
      - Aft deck:   35.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  10.83 ft / 3.30 m
      - Average freeboard:      11.79 ft / 3.60 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 139.2 %
      - Above water (accommodation/working, high = better): 91.6 %
   Waterplane Area: 10,707 Square feet or 995 Square metres
   Displacement factor (Displacement / loading): 93 %
   Structure weight / hull surface area: 69 lbs/sq ft or 338 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.33
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Misc Weight: 25t - Long Range Wireless

[Kaiser Kirk]

The 6 gun move might be a good idea... I started drawing mine today and discovered I am going to have to do a bit of Fancy arranging to make all 7 fit on that hull (might have to kick another one SF).  I had forgotten how much working room a 6" gun took vs the 4" I was working with previously.

The number of guns on centerline are the only thing that stands out right now. 6There's always that "so how much superstructure and how many boats" issue, that is just really really hard to give a good answer. x6" on a small hull seems a bit much, but I can think of some arrangements, and it sounds like Tan has done the space allocation and thinks 6 works, but 7 is problematic, and you have 6.   

Also, your encyclopedia doesn't list a 1905 152mm, but it does have an 1894 152mm/45 with 49.02kg shells.  :)

Otherwise, it's grown, but it's a far more capable vessel than it was. I think the range makes it far more servicable for your fleet and possessions. Armor is good. One thing I've read is there's a minimum thickness for facehardening, which different countries had at different levels, ranging from 75mm to 100mm, but most towards the upper end. Your 105mm nicely qualifies. I'm using 90mm as my min, but hey the Italians were first to Terni Cemented :)

I found interesting to compare to my Mercury which is 240t heavier, but has a hull that's wider and shallower with a far greater BC. She's got slightly more powerful engines (1.4%) but is half a knot slower  with a mixed battery of 7" &  3.5", but has mines and torpedoes, 10% greater range and can soak a little more damage. No conning tower armor - oversight of mine.

[Logi]

A look at a heavy-light cruiser variant using the new cruiser rules.

Widened beam and replaced the 6 centerline 152mm hoists with 3 centerline twin 203mm turrets.
Block coefficient increased from 0.513 to 0.532
Slightly increased main belt height from 2m to 2.3m
Light ship tonnage increased from 3,600t to 4,700t - an increase of 30%.
Endurance increased from 5,000nm@10kn to 6,000nm@10kn

Using the new 203/50 guns is slightly preferable because of age. It was intended in the original design that the completed Tenryuu ships would have their 152mm (old) batteries replaced with the 130mm guns when they became available. This way "saves" the expense of refitting. Flaws include low number of secondaries, mediocre speed, insufficient armor compared to armament.

As the mission of such a ship is rather different, this design is labelled under a different name.

Otowa (Tenryuu Scheme H), Japanese Heavy-Light Cruiser laid down 1905

Displacement:
   4,700 t light; 4,923 t standard; 5,562 t normal; 6,073 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.70 ft / 393.70 ft) x 52.49 ft x (17.72 / 18.98 ft)
   (120.00 m / 120.00 m) x 16.00 m  x (5.40 / 5.78 m)

Armament:
      6 - 8.00" / 203 mm 50.0 cal guns - 275.58lbs / 125.00kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1904 Model
     3 x Twin mounts on centreline ends, majority forward
      1 raised mount - superfiring
      4 - 4.72" / 120 mm 45.0 cal guns - 45.13lbs / 20.47kg shells, 200 per gun
     Quick firing guns in deck mounts, 1892 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 1,834 lbs / 832 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.13" / 105 mm   393.70 ft / 120.00 m   7.55 ft / 2.30 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.13" / 105 mm   0.98" / 25 mm      3.15" / 80 mm

   - Armoured deck - single deck:
   For and Aft decks: 0.98" / 25 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 4.13" / 105 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 20,000 shp / 14,920 Kw = 23.20 kts
   Range 6,000nm at 10.00 kts
   Bunker at max displacement = 1,150 tons (90% coal)

Complement:
   321 - 418

Cost:
   £0.575 million / $2.301 million

Distribution of weights at normal displacement:
   Armament: 442 tons, 8.0 %
      - Guns: 442 tons, 8.0 %
   Armour: 891 tons, 16.0 %
      - Belts: 454 tons, 8.2 %
      - Armament: 148 tons, 2.7 %
      - Armour Deck: 260 tons, 4.7 %
      - Conning Tower: 28 tons, 0.5 %
   Machinery: 1,650 tons, 29.7 %
   Hull, fittings & equipment: 1,687 tons, 30.3 %
   Fuel, ammunition & stores: 862 tons, 15.5 %
   Miscellaneous weights: 30 tons, 0.5 %
      - On freeboard deck: 30 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,433 lbs / 1,557 Kg = 13.4 x 8.0 " / 203 mm shells or 0.8 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 2.5 ft / 0.7 m
   Roll period: 14.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.66
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.532 / 0.542
   Length to Beam Ratio: 7.50 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  12.47 ft / 3.80 m,  12.47 ft / 3.80 m
      - Forward deck:   30.00 %,  12.47 ft / 3.80 m,  12.47 ft / 3.80 m
      - Aft deck:   35.00 %,  12.47 ft / 3.80 m,  12.47 ft / 3.80 m
      - Quarter deck:   15.00 %,  12.47 ft / 3.80 m,  12.47 ft / 3.80 m
      - Average freeboard:      12.47 ft / 3.80 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 125.1 %
      - Above water (accommodation/working, high = better): 104.9 %
   Waterplane Area: 14,178 Square feet or 1,317 Square metres
   Displacement factor (Displacement / loading): 94 %
   Structure weight / hull surface area: 92 lbs/sq ft or 447 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 1.42
      - Overall: 0.95
   Caution: Hull subject to strain in open-sea
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[eltf177]

   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 1.42
      - Overall: 0.95
   Caution: Hull subject to strain in open-sea

This might be worth fixing, 0.95 is almost there...

[Logi]

[...] using the new cruiser rules.

Although you could argue it is no longer a light cruiser and thus doesn't get those rules applied.

[Walter]

Yes, the turreted twin 8" guns would mean that the BB/AC rules apply to the vessel despite its light weight and thus the minimum hull strength should be 1. I could be wrong, but you would probably need the 1920 light cruiser tech to be allowed to build it as a light cruiser.

Don't worry, Logi. Starting to research that tech in 1905 will only costs you $125 per HY. ;D

[Logi]

You are quite right Walter.

I've fixed the issue by increasing the tonnage and reducing the bunkerage back to 5,000nm@10kn. I've bought some increases in armor in exchange:

Main belt thickened (105mm -> 120mm) and made taller (2.3m -> 2.5m)
Armored deck thickened (25mm -> 30mm)
Turret thickened (105mm -> 155mm Face, 25mm -> 30mm Other)
Conning Tower thickened (105mm -> 120mm)

Block coefficient increased yet again (0.532 -> 0.542)

Otowa A, Japanese Heavy-Light Cruiser laid down 1905

Displacement:
   5,000 t light; 5,228 t standard; 5,777 t normal; 6,216 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.70 ft / 393.70 ft) x 52.49 ft x (18.04 / 19.12 ft)
   (120.00 m / 120.00 m) x 16.00 m  x (5.50 / 5.83 m)

Armament:
      6 - 8.00" / 203 mm 50.0 cal guns - 275.58lbs / 125.00kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1904 Model
     3 x Twin mounts on centreline ends, majority forward
      1 raised mount - superfiring
      4 - 4.72" / 120 mm 45.0 cal guns - 45.13lbs / 20.47kg shells, 200 per gun
     Quick firing guns in deck mounts, 1892 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 1,834 lbs / 832 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   393.70 ft / 120.00 m   8.20 ft / 2.50 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   6.10" / 155 mm   1.18" / 30 mm      3.15" / 80 mm

   - Armoured deck - single deck:
   For and Aft decks: 1.18" / 30 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 4.72" / 120 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 20,000 shp / 14,920 Kw = 23.04 kts
   Range 5,000nm at 10.00 kts
   Bunker at max displacement = 989 tons (90% coal)

Complement:
   330 - 430

Cost:
   £0.586 million / $2.343 million

Distribution of weights at normal displacement:
   Armament: 442 tons, 7.7 %
      - Guns: 442 tons, 7.7 %
   Armour: 1,074 tons, 18.6 %
      - Belts: 564 tons, 9.8 %
      - Armament: 162 tons, 2.8 %
      - Armour Deck: 315 tons, 5.5 %
      - Conning Tower: 33 tons, 0.6 %
   Machinery: 1,650 tons, 28.6 %
   Hull, fittings & equipment: 1,803 tons, 31.2 %
   Fuel, ammunition & stores: 777 tons, 13.4 %
   Miscellaneous weights: 30 tons, 0.5 %
      - On freeboard deck: 30 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,962 lbs / 1,797 Kg = 15.5 x 8.0 " / 203 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 2.4 ft / 0.7 m
   Roll period: 14.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.66
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.542 / 0.551
   Length to Beam Ratio: 7.50 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  13.12 ft / 4.00 m,  12.80 ft / 3.90 m
      - Forward deck:   30.00 %,  12.80 ft / 3.90 m,  12.47 ft / 3.80 m
      - Aft deck:   35.00 %,  12.47 ft / 3.80 m,  12.47 ft / 3.80 m
      - Quarter deck:   15.00 %,  12.47 ft / 3.80 m,  12.47 ft / 3.80 m
      - Average freeboard:      12.61 ft / 3.84 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 120.6 %
      - Above water (accommodation/working, high = better): 103.7 %
   Waterplane Area: 14,318 Square feet or 1,330 Square metres
   Displacement factor (Displacement / loading): 94 %
   Structure weight / hull surface area: 96 lbs/sq ft or 468 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.50
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[Logi]

The modified light cruiser design in accordance with the new rules. The 120mm/45 guns are intended to be replaced with the soon to be developed 130mm/50 guns.

The 400 rounds of ammunition is equivalent to 250 rounds of the pending 130mm/50 guns and 35t of the 65t total misc weight is reserved for the installation of the larger mounts for the 130mm/50 guns.
As there is little structure that must be changed, I believe such a change would be closer to a basic refit than a refurbishment.

Such a refit would cost 140 tons, or $0.14 and 0.14 BP.
If it is counted as a refurbishment it would cost $0.84 and 0.14 BP

The 140 tons includes the weight of the gun, mount, and armor.

Tenryuu A2, Japanese Light Cruiser laid down 1905

Displacement:
   3,500 t light; 3,642 t standard; 4,094 t normal; 4,455 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.70 ft / 393.70 ft) x 40.35 ft x (16.73 / 17.88 ft)
   (120.00 m / 120.00 m) x 12.30 m  x (5.10 / 5.45 m)

Armament:
      6 - 4.72" / 120 mm 45.0 cal guns - 44.97lbs / 20.40kg shells, 400 per gun
     Quick firing guns in deck and hoist mounts, 1905 Model
     5 x Single mounts on centreline ends, majority aft
      2 raised mounts - superfiring
     1 x Single mount on centreline, aft deck forward
      Weight of broadside 270 lbs / 122 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.13" / 105 mm   393.70 ft / 120.00 m   6.56 ft / 2.00 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.39" / 10 mm      0.39" / 10 mm

   - Armoured deck - single deck:
   For and Aft decks: 0.98" / 25 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 4.13" / 105 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 20,000 shp / 14,920 Kw = 24.51 kts
   Range 5,000nm at 10.00 kts
   Bunker at max displacement = 813 tons (90% coal)

Complement:
   255 - 332

Cost:
   £0.382 million / $1.528 million

Distribution of weights at normal displacement:
   Armament: 86 tons, 2.1 %
      - Guns: 86 tons, 2.1 %
   Armour: 638 tons, 15.6 %
      - Belts: 395 tons, 9.7 %
      - Armament: 19 tons, 0.5 %
      - Armour Deck: 201 tons, 4.9 %
      - Conning Tower: 23 tons, 0.6 %
   Machinery: 1,636 tons, 40.0 %
   Hull, fittings & equipment: 1,075 tons, 26.3 %
   Fuel, ammunition & stores: 594 tons, 14.5 %
   Miscellaneous weights: 65 tons, 1.6 %
      - On freeboard deck: 65 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,256 lbs / 1,023 Kg = 42.8 x 4.7 " / 120 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 1.8 ft / 0.6 m
   Roll period: 12.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.22
   Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.539 / 0.549
   Length to Beam Ratio: 9.76 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 67
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  14.11 ft / 4.30 m,  12.14 ft / 3.70 m
      - Forward deck:   30.00 %,  12.14 ft / 3.70 m,  11.48 ft / 3.50 m
      - Aft deck:   35.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Average freeboard:      11.87 ft / 3.62 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 137.3 %
      - Above water (accommodation/working, high = better): 95.4 %
   Waterplane Area: 10,974 Square feet or 1,020 Square metres
   Displacement factor (Displacement / loading): 95 %
   Structure weight / hull surface area: 63 lbs/sq ft or 307 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.17
      - Overall: 0.99
   Caution: Hull subject to strain in open-sea
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Tenryuu as it would be refit with 130mm/50 guns.

Tenryuu A2, Japanese Light Cruiser laid down 1905

Displacement:
   3,500 t light; 3,642 t standard; 4,094 t normal; 4,455 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.70 ft / 393.70 ft) x 40.35 ft x (16.73 / 17.88 ft)
   (120.00 m / 120.00 m) x 12.30 m  x (5.10 / 5.45 m)

Armament:
      6 - 5.12" / 130 mm 50.0 cal guns - 72.75lbs / 33.00kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1905 Model
     5 x Single mounts on centreline ends, majority aft
      2 raised mounts - superfiring
     1 x Single mount on centreline, aft deck forward
      Weight of broadside 437 lbs / 198 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.13" / 105 mm   393.70 ft / 120.00 m   6.56 ft / 2.00 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.39" / 10 mm      0.39" / 10 mm

   - Armoured deck - single deck:
   For and Aft decks: 0.98" / 25 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 4.13" / 105 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 20,000 shp / 14,920 Kw = 24.51 kts
   Range 5,000nm at 10.00 kts
   Bunker at max displacement = 813 tons (90% coal)

Complement:
   255 - 332

Cost:
   £0.396 million / $1.582 million

Distribution of weights at normal displacement:
   Armament: 127 tons, 3.1 %
      - Guns: 127 tons, 3.1 %
   Armour: 639 tons, 15.6 %
      - Belts: 395 tons, 9.7 %
      - Armament: 20 tons, 0.5 %
      - Armour Deck: 201 tons, 4.9 %
      - Conning Tower: 23 tons, 0.6 %
   Machinery: 1,629 tons, 39.8 %
   Hull, fittings & equipment: 1,075 tons, 26.2 %
   Fuel, ammunition & stores: 594 tons, 14.5 %
   Miscellaneous weights: 30 tons, 0.7 %
      - On freeboard deck: 30 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,129 lbs / 966 Kg = 31.8 x 5.1 " / 130 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 1.8 ft / 0.6 m
   Roll period: 12.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.35
   Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.539 / 0.549
   Length to Beam Ratio: 9.76 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 67
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  14.11 ft / 4.30 m,  12.14 ft / 3.70 m
      - Forward deck:   30.00 %,  12.14 ft / 3.70 m,  11.48 ft / 3.50 m
      - Aft deck:   35.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Average freeboard:      11.87 ft / 3.62 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 139.6 %
      - Above water (accommodation/working, high = better): 95.4 %
   Waterplane Area: 10,974 Square feet or 1,020 Square metres
   Displacement factor (Displacement / loading): 93 %
   Structure weight / hull surface area: 64 lbs/sq ft or 313 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.17
      - Overall: 0.98
   Caution: Hull subject to strain in open-sea
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform