Japan 1870 Start

[Logi]

1st class BB, main fleet

H-09 Scheme 2A2,  Battleship laid down 1870

Displacement:
   4,500 t light; 4,742 t standard; 4,994 t normal; 5,195 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (280.00 ft / 275.00 ft) x 52.00 ft x (21.00 / 21.70 ft)
   (85.34 m / 83.82 m) x 15.85 m  x (6.40 / 6.61 m)

Armament:
      4 - 12.00" / 305 mm 15.0 cal guns - 699.99lbs / 317.51kg shells, 80 per gun
     Muzzle loading guns in Coles/Ericsson turret mounts, 1870 Model
     2 x Twin mounts on centreline ends, evenly spread
      4 - 6.00" / 152 mm 18.0 cal guns - 80.01lbs / 36.29kg shells, 100 per gun
     Muzzle loading guns in casemate mounts, 1870 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 3,120 lbs / 1,415 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   140.00 ft / 42.67 m   6.50 ft / 1.98 m
   Ends:   Unarmoured
   Upper:   6.00" / 152 mm   140.00 ft / 42.67 m   3.00 ft / 0.91 m
     Main Belt covers 78 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.00" / 127 mm   2.00" / 51 mm            -
   2nd:   1.00" / 25 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.00" / 51 mm
   Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 6.56" / 167 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines, 
   Direct drive, 1 shaft, 3,714 ihp / 2,771 Kw = 14.00 kts
   Range 2,500nm at 7.00 kts
   Bunker at max displacement = 453 tons (100% coal)

Complement:
   296 - 386

Cost:
   £0.371 million / $1.483 million

Distribution of weights at normal displacement:
   Armament: 168 tons, 3.4 %
      - Guns: 168 tons, 3.4 %
   Armour: 1,195 tons, 23.9 %
      - Belts: 647 tons, 12.9 %
      - Armament: 133 tons, 2.7 %
      - Armour Deck: 374 tons, 7.5 %
      - Conning Tower: 41 tons, 0.8 %
   Machinery: 910 tons, 18.2 %
   Hull, fittings & equipment: 1,977 tons, 39.6 %
   Fuel, ammunition & stores: 494 tons, 9.9 %
   Miscellaneous weights: 250 tons, 5.0 %
      - Above deck: 250 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,378 lbs / 1,532 Kg = 5.6 x 12.0 " / 305 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 2.6 ft / 0.8 m
   Roll period: 13.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.49
   Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.582 / 0.586
   Length to Beam Ratio: 5.29 : 1
   'Natural speed' for length: 16.58 kts
   Power going to wave formation at top speed: 44 %
   Trim (Max stability = 0, Max steadiness = 100): 65
   Bow angle (Positive = bow angles forward): -20.00 degrees
   Stern overhang: -3.00 ft / -0.91 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  9.00 ft / 2.74 m,  6.50 ft / 1.98 m
      - Forward deck:   35.00 %,  6.50 ft / 1.98 m,  6.50 ft / 1.98 m
      - Aft deck:   35.00 %,  6.50 ft / 1.98 m,  6.50 ft / 1.98 m
      - Quarter deck:   15.00 %,  6.50 ft / 1.98 m,  6.50 ft / 1.98 m
      - Average freeboard:      6.65 ft / 2.03 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 77.3 %
      - Above water (accommodation/working, high = better): 41.9 %
   Waterplane Area: 10,029 Square feet or 932 Square metres
   Displacement factor (Displacement / loading): 122 %
   Structure weight / hull surface area: 144 lbs/sq ft or 702 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.31
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Sail speed    =     7.0 knots

Displacement  = 4,994.0 tons
7 knots (5%)  =   249.7 tons

[Logi]

2nd class BB, part of the fleet screen

H-10 Scheme 3,  Scout Battleship laid down 1870
Armoured Frigate (Broadside ironclad)

Displacement:
   3,000 t light; 3,472 t standard; 3,603 t normal; 3,708 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (265.10 ft / 260.00 ft) x 40.00 ft x (20.00 / 20.49 ft)
   (80.80 m / 79.25 m) x 12.19 m  x (6.10 / 6.25 m)

Armament:
      60 - 8.00" / 203 mm 15.0 cal guns - 120.00lbs / 54.43kg shells, 100 per gun
     Muzzle loading guns in broadside mounts, 1870 Model
     30 x Single mounts on sides, evenly spread
      30 hull mounts on upper deck- Limited use in all but light seas
     30 x Single mounts on sides, evenly spread
      30 hull mounts on gun deck- Limited use in any sea
      Weight of broadside 7,200 lbs / 3,266 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.55" / 65 mm   260.00 ft / 79.25 m   10.00 ft / 3.05 m
   Upper:   2.55" / 65 mm   200.00 ft / 60.96 m   4.00 ft / 1.22 m
     Main Belt covers 154 % of normal length

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

   - Protected deck - single deck:
   For and Aft decks: 1.00" / 25 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines, 
   Direct drive, 1 shaft, 3,061 ihp / 2,284 Kw = 14.00 kts
   Range 1,500nm at 7.00 kts
   Bunker at max displacement = 236 tons (100% coal)

Complement:
   232 - 302

Cost:
   £0.383 million / $1.532 million

Distribution of weights at normal displacement:
   Armament: 481 tons, 13.3 %
      - Guns: 481 tons, 13.3 %
   Armour: 606 tons, 16.8 %
      - Belts: 331 tons, 9.2 %
      - Armament: 135 tons, 3.8 %
      - Armour Deck: 140 tons, 3.9 %
   Machinery: 714 tons, 19.8 %
   Hull, fittings & equipment: 695 tons, 19.3 %
   Fuel, ammunition & stores: 603 tons, 16.7 %
   Miscellaneous weights: 504 tons, 14.0 %
      - Above deck: 504 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,391 lbs / 631 Kg = 7.8 x 8.0 " / 203 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 12.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.16
   Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.606 / 0.609
   Length to Beam Ratio: 6.50 : 1
   'Natural speed' for length: 16.12 kts
   Power going to wave formation at top speed: 44 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: -3.00 ft / -0.91 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  14.00 ft / 4.27 m,  12.00 ft / 3.66 m
      - Forward deck:   30.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
      - Aft deck:   30.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
      - Quarter deck:   20.00 %,  12.00 ft / 3.66 m,  12.50 ft / 3.81 m
      - Average freeboard:      12.21 ft / 3.72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 117.2 %
      - Above water (accommodation/working, high = better): 73.8 %
   Waterplane Area: 7,492 Square feet or 696 Square metres
   Displacement factor (Displacement / loading): 84 %
   Structure weight / hull surface area: 83 lbs/sq ft or 408 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.05
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Sail speed       =       16.0 knots

Displacement  = 3,603.0 tons
7 knots (5%)  =    504.4 tons

[KWorld]

Broadside mounts are unarmored.  I'm guessing the 120 pounders are smoothbores, as the shell weight's very low for a rifled gun of that bore size.  [Good thing about that is that the smoothbore's very unlikely to just explode, which can certainly happen with rifled guns at this time period.]

The amount of armor is very light, it'll be useful against shell but too light to keep off much in the way of shot.

[Logi]

The 2nd-class BB is based on the HMS Victoria (the same as the one in Walter's thread). The difference is a smaller battery, overall simplification, and a hull form derived from Schneekluth, Watson-Gilfillan, etc. equations.

Since Walter's design also have 1" armor over broadside mounts, I assumed that it was typical and allowed. Similar for the main belt armor.

[Logi]

The other main component of the Fleet screen, the cruiser division. Currently 10 ships in plan.

H-11 Scheme 1,  Cruiser laid down 1870

Displacement:
   1,500 t light; 1,587 t standard; 1,666 t normal; 1,729 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (213.46 ft / 210.00 ft) x 35.00 ft x (15.00 / 15.45 ft)
   (65.06 m / 64.01 m) x 10.67 m  x (4.57 / 4.71 m)

Armament:
      2 - 8.00" / 203 mm 15.0 cal guns - 120.00lbs / 54.43kg shells, 100 per gun
     Muzzle loading guns in deck mounts, 1870 Model
     2 x Single mounts on sides amidships
      6 - 6.00" / 152 mm 18.0 cal guns - 80.01lbs / 36.29kg shells, 150 per gun
     Muzzle loading guns in deck mounts, 1870 Model
     6 x Single mounts on sides, evenly spread
      Weight of broadside 720 lbs / 327 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm         -               -
   2nd:   0.60" / 15 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.00" / 25 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines, 
   Direct drive, 1 shaft, 3,384 ihp / 2,525 Kw = 16.00 kts
   Range 1,500nm at 7.00 kts
   Bunker at max displacement = 142 tons (100% coal)

Complement:
   129 - 169

Cost:
   £0.171 million / $0.682 million

Distribution of weights at normal displacement:
   Armament: 45 tons, 2.7 %
      - Guns: 45 tons, 2.7 %
   Armour: 108 tons, 6.5 %
      - Armament: 17 tons, 1.0 %
      - Armour Deck: 91 tons, 5.4 %
   Machinery: 736 tons, 44.2 %
   Hull, fittings & equipment: 528 tons, 31.7 %
   Fuel, ammunition & stores: 166 tons, 9.9 %
   Miscellaneous weights: 83 tons, 5.0 %
      - Above deck: 83 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     470 lbs / 213 Kg = 2.6 x 8.0 " / 203 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.52
   Metacentric height 2.1 ft / 0.6 m
   Roll period: 10.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.529 / 0.533
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 14.49 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   Bow angle (Positive = bow angles forward): 20.00 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 %,  9.50 ft / 2.90 m,  7.00 ft / 2.13 m
      - Forward deck:   30.00 %,  7.00 ft / 2.13 m,  6.50 ft / 1.98 m
      - Aft deck:   30.00 %,  6.50 ft / 1.98 m,  6.50 ft / 1.98 m
      - Quarter deck:   20.00 %,  6.50 ft / 1.98 m,  6.50 ft / 1.98 m
      - Average freeboard:      6.88 ft / 2.10 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 153.9 %
      - Above water (accommodation/working, high = better): 47.5 %
   Waterplane Area: 4,859 Square feet or 451 Square metres
   Displacement factor (Displacement / loading): 84 %
   Structure weight / hull surface area: 73 lbs/sq ft or 358 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.15
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room

Sail speed    =     7.0 knots

Displacement  = 1,666.0 tons
7 knots (5%)  =    83.3 tons

[Logi]

Flagships of the fleet, they are bigger than their H-09 2A2 cousins. With this they have heavier belt, deck, and conning armor. The belt is taller and there is an end belt. The secondary is heavier as well. The ship range is doubled. Currently 2 such ships are to be built.

H-12 Scheme 2,  Flagship Battleship laid down 1870

Displacement:
   7,000 t light; 7,328 t standard; 7,971 t normal; 8,485 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (315.00 ft / 310.00 ft) x 60.00 ft x (23.00 / 24.28 ft)
   (96.01 m / 94.49 m) x 18.29 m  x (7.01 / 7.40 m)

Armament:
      4 - 12.00" / 305 mm 15.0 cal guns - 699.99lbs / 317.51kg shells, 80 per gun
     Muzzle loading guns in Coles/Ericsson turret mounts, 1870 Model
     2 x Twin mounts on centreline ends, evenly spread
      8 - 6.00" / 152 mm 18.0 cal guns - 80.01lbs / 36.29kg shells, 100 per gun
     Muzzle loading guns in casemate mounts, 1870 Model
     8 x Single mounts on sides, evenly spread
      8 - 3.00" / 76.2 mm 15.0 cal guns - 10.00lbs / 4.54kg shells, 200 per gun
     Muzzle loading guns in deck mounts, 1870 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
      Weight of broadside 3,520 lbs / 1,597 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   18.0" / 457 mm   130.00 ft / 39.62 m   10.00 ft / 3.05 m
   Ends:   3.00" / 76 mm   180.00 ft / 54.86 m   7.00 ft / 2.13 m
     Main Belt covers 65 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.00" / 127 mm   2.00" / 51 mm            -
   2nd:   1.00" / 25 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 3.00" / 76 mm
   Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines, 
   Direct drive, 1 shaft, 4,892 ihp / 3,650 Kw = 14.00 kts
   Range 5,000nm at 7.00 kts
   Bunker at max displacement = 1,157 tons (100% coal)

Complement:
   421 - 548

Cost:
   £0.506 million / $2.024 million

Distribution of weights at normal displacement:
   Armament: 191 tons, 2.4 %
      - Guns: 191 tons, 2.4 %
   Armour: 2,387 tons, 30.0 %
      - Belts: 1,356 tons, 17.0 %
      - Armament: 140 tons, 1.8 %
      - Armour Deck: 788 tons, 9.9 %
      - Conning Tower: 103 tons, 1.3 %
   Machinery: 1,199 tons, 15.0 %
   Hull, fittings & equipment: 2,705 tons, 33.9 %
   Fuel, ammunition & stores: 971 tons, 12.2 %
   Miscellaneous weights: 518 tons, 6.5 %
      - Hull above water: 119 tons
      - Above deck: 399 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,999 lbs / 3,175 Kg = 11.6 x 12.0 " / 305 mm shells or 2.0 torpedoes
   Stability (Unstable if below 1.00): 1.30
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 13.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.34
   Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.652 / 0.658
   Length to Beam Ratio: 5.17 : 1
   'Natural speed' for length: 17.61 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   Bow angle (Positive = bow angles forward): -20.00 degrees
   Stern overhang: -3.00 ft / -0.91 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  12.00 ft / 3.66 m,  8.00 ft / 2.44 m
      - Forward deck:   35.00 %,  8.00 ft / 2.44 m,  8.00 ft / 2.44 m
      - Aft deck:   35.00 %,  8.00 ft / 2.44 m,  8.00 ft / 2.44 m
      - Quarter deck:   15.00 %,  8.00 ft / 2.44 m,  10.00 ft / 3.05 m
      - Average freeboard:      8.39 ft / 2.56 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 63.5 %
      - Above water (accommodation/working, high = better): 51.0 %
   Waterplane Area: 14,081 Square feet or 1,308 Square metres
   Displacement factor (Displacement / loading): 129 %
   Structure weight / hull surface area: 143 lbs/sq ft or 700 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 1.96
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Sail speed          =     7.0 knots

Displacement        = 7,971.0 tons
7 knots (5%)        =   398.6 tons
Flagship Facilities =   119.0 tons

[Logi]

The high speed wing. Operates either as a fleet screen attachment or detaches to chase other ships. These ships can also perform other tasks such as commerce raiding. Currently 4 are to be built.

H-14 Scheme 1,  Cruiser laid down 1870
Corvette (Unarmoured)

Displacement:
   3,000 t light; 3,147 t standard; 3,353 t normal; 3,517 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (303.82 ft / 300.00 ft) x 36.00 ft x (19.00 / 19.77 ft)
   (92.60 m / 91.44 m) x 10.97 m  x (5.79 / 6.03 m)

Armament:
      2 - 8.00" / 203 mm 15.0 cal guns - 120.00lbs / 54.43kg shells, 100 per gun
     Muzzle loading guns in deck mounts, 1870 Model
     2 x Single mounts on sides amidships
      10 - 6.00" / 152 mm 18.0 cal guns - 80.01lbs / 36.29kg shells, 150 per gun
     Muzzle loading guns in broadside mounts, 1870 Model
     10 x Single mounts on sides, evenly spread
      Weight of broadside 1,040 lbs / 472 kg

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

   - Protected deck - single deck:
   For and Aft decks: 1.00" / 25 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines, 
   Direct drive, 1 shaft, 7,145 ihp / 5,330 Kw = 18.00 kts
   Range 2,500nm at 7.00 kts
   Bunker at max displacement = 370 tons (100% coal)

Complement:
   219 - 286

Cost:
   £0.357 million / $1.429 million

Distribution of weights at normal displacement:
   Armament: 60 tons, 1.8 %
      - Guns: 60 tons, 1.8 %
   Armour: 146 tons, 4.4 %
      - Armament: 7 tons, 0.2 %
      - Armour Deck: 140 tons, 4.2 %
   Machinery: 1,650 tons, 49.2 %
   Hull, fittings & equipment: 977 tons, 29.1 %
   Fuel, ammunition & stores: 353 tons, 10.5 %
   Miscellaneous weights: 168 tons, 5.0 %
      - Above deck: 168 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     649 lbs / 295 Kg = 3.6 x 8.0 " / 203 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 12.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.33
   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): 0.572 / 0.577
   Length to Beam Ratio: 8.33 : 1
   'Natural speed' for length: 17.32 kts
   Power going to wave formation at top speed: 48 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 20.00 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 %,  10.50 ft / 3.20 m,  7.00 ft / 2.13 m
      - Forward deck:   30.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Aft deck:   30.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Quarter deck:   20.00 %,  7.00 ft / 2.13 m,  8.00 ft / 2.44 m
      - Average freeboard:      7.38 ft / 2.25 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 166.8 %
      - Above water (accommodation/working, high = better): 45.6 %
   Waterplane Area: 7,490 Square feet or 696 Square metres
   Displacement factor (Displacement / loading): 83 %
   Structure weight / hull surface area: 82 lbs/sq ft or 398 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.39
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Sail speed          =     7.0 knots

Displacement        = 3,353.0 tons
7 knots (5%)        =   167.7 tons

[Logi]

The current 1870 plan.
48 ships - 119,000t

Type	Tech	Name		Δ	#	Total Δ		CB	Lpp	Armament		Vtop	FN	Vcru	Range	Armor
BB-1	1870	H-12 1		7,000	2	14,000		0.664	310.00	4x12" + 8x6" + 8x3"		14.0	0.235	7.0	5,000	B18-3-D3
BB-1	1870	H-09 2A2		4,500	8	36,000		0.582	280.00	4x12" + 4x6"		14.0	0.247	7.0	2,500	B12-6-D2
BB-2	1870	H-10 3		3,000	4	12,000		0.606	260.00	20x8"		16.0	0.293	7.0	2,500	B2.55-D1
CL-1	1870	H-11 1		1,500	30	45,000		0.529	210.00	2x8" + 6x6"		16.0	0.326	7.0	2,500	D1
CL-1	1870	H-14 1		3,000	4	12,000		0.572	300.00	2x8" + 10x6"		18.0	0.307	7.0	2,500	D1

[Walter]

30 hull mounts on upper deck- Limited use in all but light seas
...
30 hull mounts on gun deck- Limited use in any sea

That might be a bit of a problem with the guns, especially the lower ones.

I'm guessing the 120 pounders are smoothbores, as the shell weight's very low for a rifled gun of that bore size.

I can't remember where I got that figure from, but I used it in the initial sim where I used 1855 as date and when the shell weights are a lot lower. When the decision was made to use 1870 as year for our pre-1870 ships, I kept on using that weight. Should be noted that the caliber of the (smoothbore) 68-pounder is given as 8.12" on wiki while I simmed it at 6.3" to avoid SS from whining about the shell weight being too light.

The 2nd-class BB is based on the HMS Victoria

... not exactly sure which aspects it is based on...

Since Walter's design also have 1" armor over broadside mounts, I assumed that it was typical and allowed. Similar for the main belt armor.

I consider the main and upper belt to be the main protection of the guns. The broadside mount is some extra plate proctection around the gun ports. SS is not whining so I would assume that it is allowed and was it typical? Don't know.
As for the armored belt, HMS Victoria did not have any armor plating on her, so even if the 2.25" is inadequate (2.55" in Logi's design), it would be better than the historical ship. I have messed around a bit more with the design since posting it and made it slightly thicker.

[KWorld]

I can't remember where I got that figure from, but I used it in the initial sim where I used 1855 as date and when the shell weights are a lot lower. When the decision was made to use 1870 as year for our pre-1870 ships, I kept on using that weight. Should be noted that the caliber of the (smoothbore) 68-pounder is given as 8.12" on wiki while I simmed it at 6.3" to avoid SS from whining about the shell weight being too light.

I encountered that problem earlier as well: 9" Dahlgren smoothbores fire a 90 pound shot or a 75 pound shell, both of which SS complains about.  Thinking about it, we should probably let it complain, a 6." gun is going to be too light to simulate a 8.12" gun.  Leave the complaint SS puts in the file alone and just note that the guns are smoothbores.

I consider the main and upper belt to be the main protection of the guns. The broadside mount is some extra plate proctection around the gun ports. SS is not whining so I would assume that it is allowed and was it typical? Don't know.
As for the armored belt, HMS Victoria did not have any armor plating on her, so even if the 2.25" is inadequate (2.55" in Logi's design), it would be better than the historical ship. I have messed around a bit more with the design since posting it and made it slightly thicker.

Historically, guns in broadside mounts were not fitted with shields, probably because they have to recoil and the shields would make that even more dangerous to the crew (note that field guns didn't get shields until they stopped recoiling as well).  Also, guns on the battery decks are protected (to a degree) by the hull, and guns on the main deck are given some cover by the bulwarks.

[Walter]

I encountered that problem earlier as well: 9" Dahlgren smoothbores fire a 90 pound shot or a 75 pound shell, both of which SS complains about.  Thinking about it, we should probably let it complain, a 6." gun is going to be too light to simulate a 8.12" gun.  Leave the complaint SS puts in the file alone and just note that the guns are smoothbores.

Had the same with simming a few USN monitors. Those Dahlgren weights really make SS cry. :)
I guess I will apply that. Probably be best to also add that those guns are supposed to be like the historical Dahlgren guns.

Historically, guns in broadside mounts were not fitted with shields, probably because they have to recoil and the shields would make that even more dangerous to the crew (note that field guns didn't get shields until they stopped recoiling as well).  Also, guns on the battery decks are protected (to a degree) by the hull, and guns on the main deck are given some cover by the bulwarks.

Like I said, I consider it to be armor around the gunport, not on the gun itself. It's not only the crew's safety, but also the additional weight moving around the ship when the guns fire. Looking at SS, one Vittoria broadside would mean an additional 120 tons or so moving around in the ship if the armor was fitted to the guns.
Playing around with the sim a bit, I'm not so sure about the armor on the gun. I would think that if SS thinks that it is a shield on the gun, it would eat up a lot less hullstrength. I can add that inch from the guns with ease to both the main and the upper belt armor of my sim (and the armor covers an area of 260 by 30 feet).

[KWorld]

Historically, guns in broadside mounts were not fitted with shields, probably because they have to recoil and the shields would make that even more dangerous to the crew (note that field guns didn't get shields until they stopped recoiling as well).  Also, guns on the battery decks are protected (to a degree) by the hull, and guns on the main deck are given some cover by the bulwarks.

Like I said, I consider it to be armor around the gunport, not on the gun itself. It's not only the crew's safety, but also the additional weight moving around the ship when the guns fire. Looking at SS, one Vittoria broadside would mean an additional 120 tons or so moving around in the ship if the armor was fitted to the guns.
Playing around with the sim a bit, I'm not so sure about the armor on the gun. I would think that if SS thinks that it is a shield on the gun, it would eat up a lot less hullstrength. I can add that inch from the guns with ease to both the main and the upper belt armor of my sim (and the armor covers an area of 260 by 30 feet).

<shrug>  It could be that the shield it's trying to create is, if fitted to all the guns, big enough to be that inch of belt armor.

[Logi]

The 2nd-class BB is based on the HMS Victoria

... not exactly sure which aspects it is based on...

I mentioned the original hull scheme was based on your SS of the HMS Victoria. I later modified the hull form to bring the F_N and overall hull efficiency to where I wanted. The armament was simplified simply because I don't like to see such complex armament.

In any case, I will work on the designs and submit H-14 Scheme 2 and H-10 Scheme 4. I will take it that the consensus is to ignore SS warnings about the lightness of gun shells and remove the broadside armor.

[Walter]

I would also try to make the guns more useful on the H-10 design, but that is just me.

[Logi]

Well yes. So I've reduced it to a one-decker. The steam range has been increased to 2,500/10.

H-10 Scheme 5,  Scout Battleship laid down 1870
Armoured Corvette (Broadside ironclad)

Displacement:
   3,000 t light; 3,284 t standard; 3,486 t normal; 3,647 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (263.28 ft / 260.00 ft) x 42.50 ft x (19.00 / 19.73 ft)
   (80.25 m / 79.25 m) x 12.95 m  x (5.79 / 6.01 m)

Armament:
      26 - 8.00" / 203 mm 14.8 cal guns - 174.76lbs / 79.27kg shells, 85 per gun
     Muzzle loading guns in broadside mounts, 1870 Model
     26 x Single mounts on sides, evenly spread
      Weight of broadside 4,544 lbs / 2,061 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.00" / 76 mm   160.00 ft / 48.77 m   9.00 ft / 2.74 m
   Ends:   Unarmoured
     Main Belt covers 95 % of normal length

   - Armoured deck - single deck:
   For and Aft decks: 1.00" / 25 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines, 
   Direct drive, 1 shaft, 2,994 ihp / 2,233 Kw = 14.00 kts
   Range 2,500nm at 7.00 kts
   Bunker at max displacement = 363 tons (100% coal)

Complement:
   226 - 294

Cost:
   £0.284 million / $1.134 million

Distribution of weights at normal displacement:
   Armament: 205 tons, 5.9 %
      - Guns: 205 tons, 5.9 %
   Armour: 336 tons, 9.6 %
      - Belts: 192 tons, 5.5 %
      - Armour Deck: 144 tons, 4.1 %
   Machinery: 734 tons, 21.0 %
   Hull, fittings & equipment: 1,238 tons, 35.5 %
   Fuel, ammunition & stores: 486 tons, 13.9 %
   Miscellaneous weights: 488 tons, 14.0 %
      - Above deck: 488 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,096 lbs / 951 Kg = 11.7 x 8.0 " / 203 mm shells or 0.8 torpedoes
   Stability (Unstable if below 1.00): 1.25
   Metacentric height 2.1 ft / 0.6 m
   Roll period: 12.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.69
   Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.581 / 0.586
   Length to Beam Ratio: 6.12 : 1
   'Natural speed' for length: 16.12 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 42
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: -3.00 ft / -0.91 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  9.00 ft / 2.74 m,  7.00 ft / 2.13 m
      - Forward deck:   30.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Aft deck:   30.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Quarter deck:   20.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Average freeboard:      7.16 ft / 2.18 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 93.5 %
      - Above water (accommodation/working, high = better): 45.7 %
   Waterplane Area: 7,742 Square feet or 719 Square metres
   Displacement factor (Displacement / loading): 116 %
   Structure weight / hull surface area: 115 lbs/sq ft or 563 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.34
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room
   Good seaboat, rides out heavy weather easily

Sail speed          =     16.0 knots

Displacement        =  3,486.0 tons
 7 knots ( 5%)      =    174.3 tons
16 knots (14%)      =    488.0 tons