Ersatz Rhineland

[ledeper]

Ersatz Rhineland  , BCS Ligth Cruiser laid down 1917 (Engine 1916)

Displacement:
   6.153 t light; 6.374 t standard; 6.953 t normal; 7.416 t full load

Dimensions: Length overall / water x beam x draught
   512,00 ft / 508,53 ft x 49,21 ft x 21,33 ft (normal load)
   156,06 m / 155,00 m x 15,00 m  x 6,50 m

Armament:
      8 - 5,91" / 150 mm guns (4x2 guns), 102,98lbs / 46,71kg shells, 1917 Model
     Quick firing guns in deck mounts with hoists
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      4 - 3,94" / 100 mm guns in single mounts, 30,51lbs / 13,84kg shells, 1917 Model
     Quick firing guns in deck mounts
     on side, all amidships
      4 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1917 Model
     Quick firing guns in deck mounts
     on side, evenly spread
   Weight of broadside 954 lbs / 433 kg
   Shells per gun, main battery: 150
   4 - 21,0" / 533,4 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3,94" / 100 mm   379,76 ft / 115,75 m   8,43 ft / 2,57 m
   Ends:   Unarmoured
   Upper:   1,97" / 50 mm   330,54 ft / 100,75 m   8,01 ft / 2,44 m
     Main Belt covers 115 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,98" / 25 mm   0,98" / 25 mm      0,98" / 25 mm

   - Armour deck: 1,97" / 50 mm, Conning tower: 5,91" / 150 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 54.083 shp / 40.346 Kw = 30,00 kts
   Range 5.000nm at 14,00 kts
   Bunker at max displacement = 1.042 tons

Complement:
   379 - 494

Cost:
   £1,087 million / $4,346 million

Distribution of weights at normal displacement:
   Armament: 119 tons, 1,7 %
   Armour: 1.393 tons, 20,0 %
      - Belts: 727 tons, 10,5 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 35 tons, 0,5 %
      - Armour Deck: 584 tons, 8,4 %
      - Conning Tower: 46 tons, 0,7 %
   Machinery: 2.015 tons, 29,0 %
   Hull, fittings & equipment: 2.376 tons, 34,2 %
   Fuel, ammunition & stores: 800 tons, 11,5 %
   Miscellaneous weights: 250 tons, 3,6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6.170 lbs / 2.799 Kg = 59,9 x 5,9 " / 150 mm shells or 1,0 torpedoes
   Stability (Unstable if below 1.00): 1,16
   Metacentric height 2,3 ft / 0,7 m
   Roll period: 13,6 seconds
   Steadiness   - As gun platform (Average = 50 %): 55 %
         - Recoil effect (Restricted arc if above 1.00): 0,40
   Seaboat quality  (Average = 1.00): 1,09

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,456
   Length to Beam Ratio: 10,33 : 1
   'Natural speed' for length: 22,55 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19,69 ft / 6,00 m
      - Forecastle (20 %):   15,78 ft / 4,81 m
      - Mid (50 %):      15,78 ft / 4,81 m
      - Quarterdeck (15 %):   15,78 ft / 4,81 m
      - Stern:      15,78 ft / 4,81 m
      - Average freeboard:   16,09 ft / 4,91 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 111,4 %
      - Above water (accommodation/working, high = better): 113,2 %
   Waterplane Area: 16.043 Square feet or 1.490 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 85 lbs/sq ft or 417 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,96
      - Longitudinal: 1,49
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate

Warning: Armour belts longer than ship

Misc W:
FC 100 t
L/R W/L 25t
Torpedoes +reloads 40 t
Mines 50 t
Reserve 35 t

[TexanCowboy]

You can lose some weight by reducing the armoured belt length. Also, 10 torpedos per tube?

[Guinness]

My guess is the belt is long enough to cover the machinery and magazine spaces, but not much longer. My concern with the belt is that I think it's not tall enough for a 30 knots ship.

Also I think the 100mm guns might prove as much liability as asset alongside the 150mm guns on a ship with fire control. Seems to me that shell splashes might prove confusing at light cruiser engagement ranges.

[ledeper]

Ersatz Rhineland  , BCS Ligth Cruiser laid down 1917 (Engine 1916)

Displacement:
   6.196 t light; 6.418 t standard; 6.999 t normal; 7.464 t full load

Dimensions: Length overall / water x beam x draught
   512,90 ft / 508,53 ft x 49,21 ft x 21,33 ft (normal load)
   156,33 m / 155,00 m x 15,00 m  x 6,50 m

Armament:
      8 - 5,91" / 150 mm guns (4x2 guns), 102,98lbs / 46,71kg shells, 1917 Model
     Quick firing guns in deck mounts with hoists
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      4 - 3,94" / 100 mm guns in single mounts, 30,51lbs / 13,84kg shells, 1917 Model
     Quick firing guns in deck mounts
     on side, all amidships
      4 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1917 Model
     Quick firing guns in deck mounts
     on side, evenly spread
   Weight of broadside 954 lbs / 433 kg
   Shells per gun, main battery: 150
   4 - 21,0" / 533,4 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3,94" / 100 mm   369,91 ft / 112,75 m   9,42 ft / 2,87 m
   Ends:   Unarmoured
   Upper:   1,97" / 50 mm   369,91 ft / 112,75 m   8,01 ft / 2,44 m
     Main Belt covers 112 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,98" / 25 mm   0,98" / 25 mm      0,98" / 25 mm

   - Armour deck: 1,97" / 50 mm, Conning tower: 5,91" / 150 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 54.371 shp / 40.561 Kw = 30,00 kts
   Range 5.000nm at 14,00 kts
   Bunker at max displacement = 1.046 tons

Complement:
   382 - 497

Cost:
   £1,092 million / $4,368 million

Distribution of weights at normal displacement:
   Armament: 119 tons, 1,7 %
   Armour: 1.463 tons, 20,9 %
      - Belts: 796 tons, 11,4 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 35 tons, 0,5 %
      - Armour Deck: 586 tons, 8,4 %
      - Conning Tower: 47 tons, 0,7 %
   Machinery: 2.026 tons, 28,9 %
   Hull, fittings & equipment: 2.388 tons, 34,1 %
   Fuel, ammunition & stores: 803 tons, 11,5 %
   Miscellaneous weights: 200 tons, 2,9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6.304 lbs / 2.860 Kg = 61,2 x 5,9 " / 150 mm shells or 1,1 torpedoes
   Stability (Unstable if below 1.00): 1,17
   Metacentric height 2,3 ft / 0,7 m
   Roll period: 13,6 seconds
   Steadiness   - As gun platform (Average = 50 %): 56 %
         - Recoil effect (Restricted arc if above 1.00): 0,40
   Seaboat quality  (Average = 1.00): 1,12

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,459
   Length to Beam Ratio: 10,33 : 1
   'Natural speed' for length: 22,55 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      24,80 ft / 7,56 m
      - Forecastle (20 %):   15,78 ft / 4,81 m
      - Mid (50 %):      15,78 ft / 4,81 m
      - Quarterdeck (15 %):   15,78 ft / 4,81 m
      - Stern:      15,78 ft / 4,81 m
      - Average freeboard:   16,50 ft / 5,03 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 110,4 %
      - Above water (accommodation/working, high = better): 112,6 %
   Waterplane Area: 16.083 Square feet or 1.494 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 85 lbs/sq ft or 415 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,95
      - Longitudinal: 1,53
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate

Misc W:
FC 100 t
L/R W/L 25t
Torpedoes +reloads 25 t
Mines 30 t
Reserve 15 t