Logi's Design Studies

[Logi]

A tiny battleship meant to protect the coastal waters.

Hull-003,  Light Battleship laid down 1910

Displacement:
   10,332 t light; 11,441 t standard; 12,000 t normal; 12,447 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (450.00 ft / 450.00 ft) x 71.00 ft x (24.00 / 24.70 ft)
   (137.16 m / 137.16 m) x 21.64 m  x (7.32 / 7.53 m)

Armament:
      8 - 12.00" / 305 mm 50.0 cal guns - 914.66lbs / 414.88kg shells, 200 per gun
     Breech loading guns in turret on barbette mounts, 1910 Model
     4 x Twin mounts on centreline, evenly spread
      20 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 150 per gun
     Breech loading guns in casemate mounts, 1910 Model
     20 x Single mounts on sides, evenly spread
      Weight of broadside 7,995 lbs / 3,626 kg
      Main Torpedoes
      16 - 21.7" / 550 mm, 22.97 ft / 7.00 m torpedoes - 1.524 t each, 24.386 t total
   In 8 sets of deck mounted side rotating tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   330.00 ft / 100.58 m   8.00 ft / 2.44 m
   Ends:   3.00" / 76 mm   120.00 ft / 36.58 m   8.00 ft / 2.44 m
   Upper:   4.00" / 102 mm   330.00 ft / 100.58 m   8.00 ft / 2.44 m
     Main Belt covers 113 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      0.79" / 20 mm   400.00 ft / 121.92 m   20.00 ft / 6.10 m
   Beam between torpedo bulkheads 60.00 ft / 18.29 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   7.00" / 178 mm      9.00" / 229 mm
   2nd:   4.50" / 114 mm   2.00" / 51 mm      5.00" / 127 mm

   - Armoured deck - single deck:
   For and Aft decks: 3.00" / 76 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

   - Conning towers: Forward 8.00" / 203 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 11,765 shp / 8,776 Kw = 18.00 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 1,006 tons (100% coal)

Complement:
   573 - 745

Cost:
   £1.232 million / $4.927 million

Distribution of weights at normal displacement:
   Armament: 1,612 tons, 13.4 %
      - Guns: 1,563 tons, 13.0 %
      - Weapons: 49 tons, 0.4 %
   Armour: 4,441 tons, 37.0 %
      - Belts: 1,895 tons, 15.8 %
      - Torpedo bulkhead: 234 tons, 1.9 %
      - Armament: 1,132 tons, 9.4 %
      - Armour Deck: 1,091 tons, 9.1 %
      - Conning Tower: 90 tons, 0.8 %
   Machinery: 535 tons, 4.5 %
   Hull, fittings & equipment: 3,744 tons, 31.2 %
   Fuel, ammunition & stores: 1,668 tons, 13.9 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     12,585 lbs / 5,709 Kg = 14.6 x 12.0 " / 305 mm shells or 2.3 torpedoes
   Stability (Unstable if below 1.00): 1.07
   Metacentric height 3.4 ft / 1.0 m
   Roll period: 16.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.69
   Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.548 / 0.552
   Length to Beam Ratio: 6.34 : 1
   'Natural speed' for length: 21.21 kts
   Power going to wave formation at top speed: 41 %
   Trim (Max stability = 0, Max steadiness = 100): 66
   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 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Forward deck:   30.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Aft deck:   35.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Quarter deck:   15.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Average freeboard:      11.00 ft / 3.35 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 92.0 %
      - Above water (accommodation/working, high = better): 79.6 %
   Waterplane Area: 22,250 Square feet or 2,067 Square metres
   Displacement factor (Displacement / loading): 92 %
   Structure weight / hull surface area: 144 lbs/sq ft or 701 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.41
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[KWorld]

Kind of a lengthened cousin of Espana, eh?  The extra length allows you to move the en echelon turrets to the centerline.  The torpedo tubes are problematic, however: first offl, they're a major fire hazard at dreadnought battle ranges, second off, they block your 4" guns line of fire (because they're on the same leve and they have to be in front of the 4" guns to avoid being right below the barrels of the l2" guns).  Move one or the other up or down (or get rid of most of the torpedoes, my personal recommendation).  Lack of conning tower armor is also risky, a torpedo boat that gets close could shoot up the bridge crew with a 6 pounder.

[Logi]

The torpedo tubes are a consideration of the smaller ships it would have to dispatch along with the other duties of such a ship. But it is perfectly valid that there is no space for them - I don't believe in placing submerged torpedoes (expect on submarines ;)) so they'll be removed entirely.

So torpedo tubes removed and aft conning tower given some armor. That's all the changes.

Hull-003,  Light Battleship laid down 1910

Displacement:
   10,275 t light; 11,441 t standard; 12,000 t normal; 12,447 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (450.00 ft / 450.00 ft) x 71.00 ft x (24.00 / 24.70 ft)
   (137.16 m / 137.16 m) x 21.64 m  x (7.32 / 7.53 m)

Armament:
      8 - 12.00" / 305 mm 50.0 cal guns - 914.66lbs / 414.88kg shells, 200 per gun
     Breech loading guns in turret on barbette mounts, 1910 Model
     4 x Twin mounts on centreline, evenly spread
      20 - 4.00" / 102 mm 50.0 cal guns - 33.89lbs / 15.37kg shells, 300 per gun
     Breech loading guns in casemate mounts, 1910 Model
     20 x Single mounts on sides, evenly spread
      Weight of broadside 7,995 lbs / 3,626 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   330.00 ft / 100.58 m   8.00 ft / 2.44 m
   Ends:   3.00" / 76 mm   120.00 ft / 36.58 m   8.00 ft / 2.44 m
   Upper:   4.00" / 102 mm   330.00 ft / 100.58 m   8.00 ft / 2.44 m
     Main Belt covers 113 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      0.79" / 20 mm   330.00 ft / 100.58 m   20.00 ft / 6.10 m
   Beam between torpedo bulkheads 61.00 ft / 18.59 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   7.00" / 178 mm      9.00" / 229 mm
   2nd:   4.00" / 102 mm   2.00" / 51 mm      5.00" / 127 mm

   - Armoured deck - single deck:
   For and Aft decks: 3.00" / 76 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

   - Conning towers: Forward 8.00" / 203 mm, Aft 4.00" / 102 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 11,765 shp / 8,776 Kw = 18.00 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 1,006 tons (100% coal)

Complement:
   573 - 745

Cost:
   £1.230 million / $4.919 million

Distribution of weights at normal displacement:
   Armament: 1,563 tons, 13.0 %
      - Guns: 1,563 tons, 13.0 %
   Armour: 4,430 tons, 36.9 %
      - Belts: 1,895 tons, 15.8 %
      - Torpedo bulkhead: 193 tons, 1.6 %
      - Armament: 1,116 tons, 9.3 %
      - Armour Deck: 1,091 tons, 9.1 %
      - Conning Towers: 136 tons, 1.1 %
   Machinery: 535 tons, 4.5 %
   Hull, fittings & equipment: 3,747 tons, 31.2 %
   Fuel, ammunition & stores: 1,725 tons, 14.4 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     12,540 lbs / 5,688 Kg = 14.5 x 12.0 " / 305 mm shells or 2.6 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 3.5 ft / 1.1 m
   Roll period: 16.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.68
   Seaboat quality  (Average = 1.00): 1.11

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.548 / 0.552
   Length to Beam Ratio: 6.34 : 1
   'Natural speed' for length: 21.21 kts
   Power going to wave formation at top speed: 41 %
   Trim (Max stability = 0, Max steadiness = 100): 63
   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 %,  14.00 ft / 4.27 m,  11.00 ft / 3.35 m
      - Forward deck:   30.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Aft deck:   35.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Quarter deck:   15.00 %,  11.00 ft / 3.35 m,  12.00 ft / 3.66 m
      - Average freeboard:      11.32 ft / 3.45 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 91.1 %
      - Above water (accommodation/working, high = better): 81.4 %
   Waterplane Area: 22,250 Square feet or 2,067 Square metres
   Displacement factor (Displacement / loading): 92 %
   Structure weight / hull surface area: 143 lbs/sq ft or 699 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.44
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[KWorld]

OK, about the only thing left is the 4" guns: if you're happy with their cramped layout, they should be quick firing guns rather than breech loaders.

[Logi]

I think it's a necessary evil (where else would you put them?) and the change from BL to QF actually doesn't make a difference in SS so I wouldn't post the revised copy.

Here is a similar design though following along the lines of the RL Dante Alighieri and Gangut battleships - triples. The ship uses triples to shorten the citadel - allowing for:
+ 1 12"/50 gun
+ 1" 12"/50 turret barbette armor
+ 1" main belt armor
~ 4 Raised secondaries
+ 50 rounds per gun for secondaries

Hull-004,  Light Battleship laid down 1910

Displacement:
   10,163 t light; 11,450 t standard; 12,000 t normal; 12,440 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (400.00 ft / 400.00 ft) x 73.00 ft x (26.00 / 26.75 ft)
   (121.92 m / 121.92 m) x 22.25 m  x (7.92 / 8.15 m)

Armament:
      9 - 12.00" / 305 mm 50.0 cal guns - 914.65lbs / 414.88kg shells, 200 per gun
     Breech loading guns in turret on barbette mounts, 1910 Model
     3 x Twin mounts on centreline, evenly spread
      20 - 4.00" / 102 mm 50.0 cal guns - 33.89lbs / 15.37kg shells, 350 per gun
     Quick firing guns in casemate mounts, 1910 Model
     20 x Single mounts on sides, evenly spread
      8 raised mounts
      Weight of broadside 8,910 lbs / 4,041 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.0" / 330 mm   260.00 ft / 79.25 m   8.00 ft / 2.44 m
   Ends:   3.00" / 76 mm   140.00 ft / 42.67 m   8.00 ft / 2.44 m
   Upper:   4.00" / 102 mm   260.00 ft / 79.25 m   8.00 ft / 2.44 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      0.79" / 20 mm   260.00 ft / 79.25 m   20.00 ft / 6.10 m
   Beam between torpedo bulkheads 64.00 ft / 19.51 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   7.00" / 178 mm      10.0" / 254 mm
   2nd:   4.00" / 102 mm   2.00" / 51 mm      5.00" / 127 mm

   - Armoured deck - single deck:
   For and Aft decks: 3.00" / 76 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

   - Conning towers: Forward 8.00" / 203 mm, Aft 4.00" / 102 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 12,272 shp / 9,155 Kw = 18.00 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 991 tons (100% coal)

Complement:
   573 - 745

Cost:
   £1.324 million / $5.296 million

Distribution of weights at normal displacement:
   Armament: 1,760 tons, 14.7 %
      - Guns: 1,760 tons, 14.7 %
   Armour: 4,121 tons, 34.3 %
      - Belts: 1,701 tons, 14.2 %
      - Torpedo bulkhead: 152 tons, 1.3 %
      - Armament: 1,130 tons, 9.4 %
      - Armour Deck: 1,002 tons, 8.3 %
      - Conning Towers: 136 tons, 1.1 %
   Machinery: 558 tons, 4.6 %
   Hull, fittings & equipment: 3,725 tons, 31.0 %
   Fuel, ammunition & stores: 1,837 tons, 15.3 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11,016 lbs / 4,997 Kg = 12.7 x 12.0 " / 305 mm shells or 2.2 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 3.6 ft / 1.1 m
   Roll period: 16.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.71
   Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.553 / 0.557
   Length to Beam Ratio: 5.48 : 1
   'Natural speed' for length: 20.00 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 64
   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 %,  12.00 ft / 3.66 m,  11.00 ft / 3.35 m
      - Forward deck:   30.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Aft deck:   35.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Quarter deck:   15.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Average freeboard:      11.08 ft / 3.38 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 98.5 %
      - Above water (accommodation/working, high = better): 74.7 %
   Waterplane Area: 20,440 Square feet or 1,899 Square metres
   Displacement factor (Displacement / loading): 88 %
   Structure weight / hull surface area: 157 lbs/sq ft or 767 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 1.96
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[Logi]

Been a while - the concept below is as an alternative to the eventual Alaska design. Since the initial demand was for a Pocket Battleship like that of the Deutschland-class, that is what I designed.

In order to keep the speed high (32 kts) and the ship relatively protected, the size had to balloon (originally a 15,000 ton normal design). To keep the inflation contained, much like the real Alaska class, no TBS is installed.

Keeping line with USN practice, the range is the standard 10,000 nm @ 15 kts (Baltimore) and has the same comfortable secondary battery numbers and arrangement.

The GM is an adequate 3.83 ft and the GM/Beam ratio 0.05319. The roll period is a longer than I would want, ideally I would go for a 7-10 sec range, but SS is quite stubborn on the issue.

The end result is a ship about 12,000 tons lighter at full load than the historical Alaska with slightly thicker armor and 1/3 less firepower. By comparison, the ship is about 4,500 tons heavier than the Baltimore heavy cruisers.

Alaska, USN PBB laid down 1942

Displacement:
   18,427 t light; 19,174 t standard; 21,000 t normal; 22,461 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (750.00 ft / 750.00 ft) x 72.00 ft x (26.00 / 27.39 ft)
   (228.60 m / 228.60 m) x 21.95 m  x (7.92 / 8.35 m)

Armament:
      6 - 12.00" / 305 mm 50.0 cal guns - 1,140.01lbs / 517.10kg shells, 50 per gun
     Breech loading guns in turret on barbette mounts, 1937 Model
     2 x 3-gun mounts on centreline, forward evenly spread
      12 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 200 per gun
     Dual purpose guns in deck and hoist mounts, 1932 Model
     6 x Single mounts on sides, evenly spread
      48 - 1.57" / 40.0 mm 70.0 cal guns - 2.18lbs / 0.99kg shells, 1,000 per gun
     Anti-air guns in deck mounts, 1943 Model
     24 x Twin mounts on sides, evenly spread
      Weight of broadside 7,657 lbs / 3,473 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   10.0" / 254 mm   488.00 ft / 148.74 m   16.00 ft / 4.88 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   13.0" / 330 mm   5.00" / 127 mm      11.0" / 279 mm
   2nd:   1.00" / 25 mm   1.00" / 25 mm      1.00" / 25 mm
   3rd:   0.25" / 6 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 4.00" / 102 mm

   - Conning towers: Forward 4.50" / 114 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 122,404 shp / 91,313 Kw = 32.00 kts
   Range 10,000nm at 15.00 kts
   Bunker at max displacement = 3,287 tons

Complement:
   871 - 1,133

Cost:
   £11.005 million / $44.018 million

Distribution of weights at normal displacement:
   Armament: 1,539 tons, 7.3 %
      - Guns: 1,539 tons, 7.3 %
   Armour: 6,382 tons, 30.4 %
      - Belts: 3,186 tons, 15.2 %
      - Armament: 888 tons, 4.2 %
      - Armour Deck: 2,234 tons, 10.6 %
      - Conning Tower: 74 tons, 0.4 %
   Machinery: 3,198 tons, 15.2 %
   Hull, fittings & equipment: 7,308 tons, 34.8 %
   Fuel, ammunition & stores: 2,573 tons, 12.3 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     26,864 lbs / 12,185 Kg = 31.1 x 12.0 " / 305 mm shells or 2.7 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 3.8 ft / 1.2 m
   Roll period: 15.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.71
   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): 0.524 / 0.532
   Length to Beam Ratio: 10.42 : 1
   'Natural speed' for length: 27.39 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   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 %,  22.00 ft / 6.71 m,  18.00 ft / 5.49 m
      - Forward deck:   30.00 %,  18.00 ft / 5.49 m,  17.00 ft / 5.18 m
      - Aft deck:   35.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
      - Quarter deck:   15.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
      - Average freeboard:      17.67 ft / 5.39 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 77.0 %
      - Above water (accommodation/working, high = better): 138.6 %
   Waterplane Area: 36,782 Square feet or 3,417 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 145 lbs/sq ft or 709 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.01
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room

[Logi]

This is an attempt to design the N3 RRC Armored Cruiser, Huang Hun, with more SS and NA experience.

The first thing changed was the laid down date, I instead waited for newer engines and other technologies (such as All-or-Nothing and Sloped Armor).

The end result was a lighter and overall stronger ship. The main battery is centralized and reduced to lower the GM and avoid super-firing penalties. The speed was increased from 25.84 to 28 by adopting oil-firing boilers. The armor was thickened were it mattered, resulting in an immunity from 6,000 yds to 18,000 yds against the Russian 12"/52 1907 pattern gun.

Huang Hun, RRC PBB laid down 1917 (Engine 1916)

Displacement:
   12,000 t light; 12,423 t standard; 13,386 t normal; 14,156 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (550.00 ft / 550.00 ft) x 73.00 ft x (23.00 / 24.00 ft)
   (167.64 m / 167.64 m) x 22.25 m  x (7.01 / 7.32 m)

Armament:
      6 - 11.00" / 279 mm 45.0 cal guns - 671.18lbs / 304.44kg shells, 50 per gun
     Breech loading guns in turret on barbette mounts, 1913 Model
     2 x 3-gun mounts on centreline ends, evenly spread
      12 - 4.00" / 102 mm 45.0 cal guns - 32.28lbs / 14.64kg shells, 200 per gun
     Quick firing guns in deck mounts, 1917 Model
     6 x Single mounts on sides, evenly spread
      4 - 0.50" / 12.7 mm 45.0 cal guns - 0.07lbs / 0.03kg shells, 1,000 per gun
     Machine guns in deck mounts, 1917 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 4,415 lbs / 2,002 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   10.0" / 254 mm   300.00 ft / 91.44 m   16.00 ft / 4.88 m
   Ends:   Unarmoured
     Main Belt covers 84 % of normal length
     Main Belt inclined 20.00 degrees (positive = in)

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   13.2" / 334 mm   3.00" / 76 mm      11.0" / 279 mm
   2nd:   2.00" / 51 mm   1.00" / 25 mm            -
   3rd:   0.25" / 6 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 2.50" / 64 mm

   - Conning towers: Forward 4.00" / 102 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 63,407 shp / 47,302 Kw = 28.00 kts
   Range 8,000nm at 12.00 kts
   Bunker at max displacement = 1,734 tons

Complement:
   621 - 808

Cost:
   £2.083 million / $8.332 million

Distribution of weights at normal displacement:
   Armament: 971 tons, 7.3 %
      - Guns: 971 tons, 7.3 %
   Armour: 3,888 tons, 29.0 %
      - Belts: 2,109 tons, 15.8 %
      - Armament: 708 tons, 5.3 %
      - Armour Deck: 1,022 tons, 7.6 %
      - Conning Tower: 49 tons, 0.4 %
   Machinery: 2,362 tons, 17.6 %
   Hull, fittings & equipment: 4,528 tons, 33.8 %
   Fuel, ammunition & stores: 1,386 tons, 10.4 %
   Miscellaneous weights: 250 tons, 1.9 %
      - Above deck: 250 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     16,043 lbs / 7,277 Kg = 24.1 x 11.0 " / 279 mm shells or 2.2 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 16.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.50
   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): 0.507 / 0.514
   Length to Beam Ratio: 7.53 : 1
   'Natural speed' for length: 23.45 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 %,  21.00 ft / 6.40 m,  18.00 ft / 5.49 m
      - Forward deck:   30.00 %,  18.00 ft / 5.49 m,  16.00 ft / 4.88 m
      - Aft deck:   35.00 %,  16.00 ft / 4.88 m,  15.00 ft / 4.57 m
      - Quarter deck:   15.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
      - Average freeboard:      16.62 ft / 5.06 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 83.6 %
      - Above water (accommodation/working, high = better): 133.8 %
   Waterplane Area: 26,931 Square feet or 2,502 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 129 lbs/sq ft or 632 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.46
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[Logi]

An 1870 period ironclad warship. The arrangement is reminiscent of the USS Monitor. I lowered the ship's trim to increase the metacentric height and reduce the roll period. Despite what SS thinks, a roll period longer than 11 sec is generally not good, neither is a GM/B ratio lower than 0.05.

Hull-05,  Armored Ship laid down 1870

Displacement:
   3,056 t light; 3,189 t standard; 3,500 t normal; 3,749 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (220.00 ft / 220.00 ft) x 46.00 ft x (20.00 / 21.20 ft)
   (67.06 m / 67.06 m) x 14.02 m  x (6.10 / 6.46 m)

Armament:
      2 - 12.00" / 305 mm 13.5 cal guns - 706.01lbs / 320.24kg shells, 80 per gun
     Muzzle loading guns in Coles/Ericsson turret mount, 1870 Model
     1 x Twin mount on centreline, forward deck aft
      Weight of broadside 1,412 lbs / 640 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   220.00 ft / 67.06 m   8.00 ft / 2.44 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   14.0" / 356 mm   10.0" / 254 mm            -

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

   - Conning towers: Forward 7.90" / 201 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 1,795 ihp / 1,339 Kw = 12.00 kts
   Range 3,000nm at 8.00 kts
   Bunker at max displacement = 560 tons (100% coal)

Complement:
   226 - 295

Cost:
   £0.204 million / $0.817 million

Distribution of weights at normal displacement:
   Armament: 67 tons, 1.9 %
      - Guns: 67 tons, 1.9 %
   Armour: 1,299 tons, 37.1 %
      - Belts: 781 tons, 22.3 %
      - Armament: 207 tons, 5.9 %
      - Armour Deck: 272 tons, 7.8 %
      - Conning Tower: 39 tons, 1.1 %
   Machinery: 440 tons, 12.6 %
   Hull, fittings & equipment: 1,244 tons, 35.5 %
   Fuel, ammunition & stores: 444 tons, 12.7 %
   Miscellaneous weights: 6 tons, 0.2 %
      - Hull below water: 6 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,558 lbs / 1,614 Kg = 5.9 x 12.0 " / 305 mm shells or 1.7 torpedoes
   Stability (Unstable if below 1.00): 1.37
   Metacentric height 2.7 ft / 0.8 m
   Roll period: 11.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.23
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has rise aft of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.605 / 0.612
   Length to Beam Ratio: 4.78 : 1
   'Natural speed' for length: 14.83 kts
   Power going to wave formation at top speed: 44 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   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 %,  5.20 ft / 1.58 m,  5.20 ft / 1.58 m
      - Forward deck:   30.00 %,  5.20 ft / 1.58 m,  5.20 ft / 1.58 m
      - Aft deck:   35.00 %,  5.50 ft / 1.68 m,  5.20 ft / 1.58 m
      - Quarter deck:   15.00 %,  5.20 ft / 1.58 m,  5.20 ft / 1.58 m
      - Average freeboard:      5.25 ft / 1.60 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 52.6 %
      - Above water (accommodation/working, high = better): 32.4 %
   Waterplane Area: 7,282 Square feet or 676 Square metres
   Displacement factor (Displacement / loading): 139 %
   Structure weight / hull surface area: 122 lbs/sq ft or 598 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.68
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room

[Walter]

Maybe make it look a bit more like the USS Monitor by lowering the freeboard a bit more. :)

Considereing that the other points of the freeboard are 5.20 ft, I assume that the 5.50 ft is a typing error.

[Jefgte]

IMO, I m not fan of this kind of ship.
During the war, monitors with low freeboard made good work on rivers but were nearly unable to work in coastal sea.
I note on your SS a range of 3000nm.
If you want to work in coastal waters, increase forecastle freeboard by one deck or half deck.
--
Floating battery (Tonnante) of Crimean war had higher freeboard

Jef  ;)

[Logi]

I did as Jef suggested and increased the foredeck and forecastle height by 1 deck. I was able to buy a bit more range (4000 vs 3000) and speed (12.5 vs 12) by accepting a lower GM/B ratio (0.045 vs 0.059) by modifying the hull dimensions.

Hull-05 Scheme 2,  Armored Ship laid down 1870

Displacement:
   2,955 t light; 3,087 t standard; 3,500 t normal; 3,830 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (200.00 ft / 200.00 ft) x 40.00 ft x (24.00 / 25.94 ft)
   (60.96 m / 60.96 m) x 12.19 m  x (7.32 / 7.91 m)

Armament:
      2 - 12.00" / 305 mm 13.5 cal guns - 706.01lbs / 320.24kg shells, 80 per gun
     Muzzle loading guns in Coles/Ericsson turret mount, 1870 Model
     1 x Twin mount on centreline, forward deck aft
      Weight of broadside 1,412 lbs / 640 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   200.00 ft / 60.96 m   8.00 ft / 2.44 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   14.0" / 356 mm   10.0" / 254 mm            -

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

   - Conning towers: Forward 10.00" / 254 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 2,178 ihp / 1,625 Kw = 12.50 kts
   Range 4,000nm at 8.00 kts
   Bunker at max displacement = 743 tons (100% coal)

Complement:
   226 - 295

Cost:
   £0.214 million / $0.856 million

Distribution of weights at normal displacement:
   Armament: 67 tons, 1.9 %
      - Guns: 67 tons, 1.9 %
   Armour: 1,190 tons, 34.0 %
      - Belts: 710 tons, 20.3 %
      - Armament: 207 tons, 5.9 %
      - Armour Deck: 223 tons, 6.4 %
      - Conning Tower: 50 tons, 1.4 %
   Machinery: 534 tons, 15.3 %
   Hull, fittings & equipment: 1,164 tons, 33.3 %
   Fuel, ammunition & stores: 545 tons, 15.6 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,976 lbs / 1,350 Kg = 4.9 x 12.0 " / 305 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 1.8 ft / 0.5 m
   Roll period: 12.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.55
   Seaboat quality  (Average = 1.00): 1.23

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.638 / 0.646
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 14.14 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 41
   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 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Forward deck:   30.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Aft deck:   35.00 %,  4.00 ft / 1.22 m,  4.00 ft / 1.22 m
      - Quarter deck:   15.00 %,  4.00 ft / 1.22 m,  4.00 ft / 1.22 m
      - Average freeboard:      7.50 ft / 2.29 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 61.0 %
      - Above water (accommodation/working, high = better): 36.4 %
   Waterplane Area: 5,965 Square feet or 554 Square metres
   Displacement factor (Displacement / loading): 135 %
   Structure weight / hull surface area: 120 lbs/sq ft or 585 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.84
      - Longitudinal: 4.69
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room
   Good seaboat, rides out heavy weather easily

[KWorld]

The downside of the redesign is that while you've now improved the seakeeping, you've also made the ship substantially more vulnerable, because that raised foredeck has no protection from enemy projectiles.  I would recommend some upper belt armor.  The other flaw I can see is that the draft is VERY high for it's size, meaning this ship is going to quite limited in where it can sail and prone to grounding


Classic Monitor-style designs are limited in their usefulness, absolutely.  The other side of the coin is that they're quite good at what they're good at, so like so many things at this time period, you have to choose what's important to you.

[Jefgte]

Classic Monitor-style designs are limited in their usefulness, absolutely.  The other side of the coin is that they're quite good at what they're good at, so like so many things at this time period, you have to choose what's important to you.

From wiki:
"The body of water known as Hampton Roads is one of the world's largest natural harbors (more accurately a roadstead or "roads"). It incorporates the mouths of the Elizabeth River and James River with several smaller rivers and empties into the Chesapeake Bay near its mouth leading to the Atlantic Ocean."

Monitors with low freeboard are very good to defend Elisabeth & James river mouths... or, by extension, other river mouths.

In our SIM, defend an estuary is short for a warship job => Increase freeboard to defend ocean coast & harbors => built a 3rd line battleship to work @ the end of the battleline.

:) Just Jef opinion  :)

[Logi]

I think that's a bit misleading. The limitation imposed by high draft are the same no matter the displacement, rather than as you suggest, a function of the displacement.
As far as it's draft goes, it's about the same at other vessels of the period (granted ocean-going). The only drawback for it's high draft relative to it's beam is that it reduces it's metacentric height.

As you suggest, it's not going to be the best ship for monitor-ese work, however I designed it as a sort of fusion between a true monitor and an ocean-going ironclad warship ala HMS Devastation. Which gives a hint as to the sort of mission expected. As far as pure river defense work, that seems to be more the territory of 1000 tons or smaller ships.

I should change the deck armor scheme to protected deck - single rather than the current setting, but changing it doesn't affect the ship strength, so I'll refrain from posting it again. This should counteract the unprotected raised foredeck somewhat.

[Logi]

This design is meant to take on the tasks of a monitor (patrol rivers and provide naval fire-support for troops near the rivers).

Hull-06 Scheme 1,  Monitor laid down 1870

Displacement:
   906 t light; 970 t standard; 1,000 t normal; 1,024 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (160.00 ft / 160.00 ft) x 31.00 ft x (10.00 / 10.21 ft)
   (48.77 m / 48.77 m) x 9.45 m  x (3.05 / 3.11 m)

Armament:
      4 - 9.00" / 229 mm 14.0 cal guns - 250.00lbs / 113.40kg shells, 80 per gun
     Muzzle loading guns in Coles/Ericsson turret mounts, 1870 Model
     2 x Twin mounts on centreline ends, evenly spread
      Weight of broadside 1,000 lbs / 454 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.00" / 102 mm   160.00 ft / 48.77 m   6.00 ft / 1.83 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.00" / 127 mm   4.00" / 102 mm            -

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

   - Conning towers: Forward 4.00" / 102 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 80 ihp / 60 Kw = 6.00 kts
   Range 1,000nm at 6.00 kts
   Bunker at max displacement = 53 tons (100% coal)

Complement:
   88 - 115

Cost:
   £0.066 million / $0.263 million

Distribution of weights at normal displacement:
   Armament: 74 tons, 7.4 %
      - Guns: 74 tons, 7.4 %
   Armour: 324 tons, 32.4 %
      - Belts: 142 tons, 14.2 %
      - Armament: 100 tons, 10.0 %
      - Armour Deck: 74 tons, 7.4 %
      - Conning Tower: 9 tons, 0.9 %
   Machinery: 20 tons, 2.0 %
   Hull, fittings & equipment: 488 tons, 48.8 %
   Fuel, ammunition & stores: 94 tons, 9.4 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,327 lbs / 602 Kg = 5.2 x 9.0 " / 229 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 1.2 ft / 0.4 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.53
   Seaboat quality  (Average = 1.00): 0.72

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.706 / 0.708
   Length to Beam Ratio: 5.16 : 1
   'Natural speed' for length: 12.65 kts
   Power going to wave formation at top speed: 19 %
   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 %,  3.00 ft / 0.91 m,  3.00 ft / 0.91 m
      - Forward deck:   30.00 %,  3.00 ft / 0.91 m,  3.00 ft / 0.91 m
      - Aft deck:   35.00 %,  3.00 ft / 0.91 m,  3.00 ft / 0.91 m
      - Quarter deck:   15.00 %,  3.00 ft / 0.91 m,  3.00 ft / 0.91 m
      - Average freeboard:      3.00 ft / 0.91 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 38.6 %
      - Above water (accommodation/working, high = better): 25.8 %
   Waterplane Area: 3,972 Square feet or 369 Square metres
   Displacement factor (Displacement / loading): 151 %
   Structure weight / hull surface area: 105 lbs/sq ft or 514 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.86
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather