1919 studies - next generation

[Jefgte]

BB next generation

27250T-2T3x406, Peru BB laid down 1919 (Engine 1916)

Displacement:
   27 250 t light; 28 621 t standard; 30 079 t normal; 31 245 t full load

Dimensions: Length overall / water x beam x draught
   682.41 ft / 682.41 ft x 104.99 ft x 25.56 ft (normal load)
   208.00 m / 208.00 m x 32.00 m  x 7.79 m

Armament:
      6 - 15.98" / 406 mm guns (2x3 guns), 2 041.96lbs / 926.22kg shells, 1919 Model
     Breech loading guns in turrets (on barbettes)
     on centreline, evenly spread
      6 - 5.98" / 152 mm guns (2x3 guns), 107.15lbs / 48.60kg shells, 1919 Model
     Breech loading guns in turrets (on barbettes)
     on centreline, evenly spread, all raised mounts
      12 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1919 Model
     Quick firing guns in casemate mounts
     on side, evenly spread
      4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1919 Model
     Quick firing guns in deck mounts
     on side, evenly spread, all raised mounts
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 13 582 lbs / 6 160 kg
   Shells per gun, main battery: 100

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.4" / 340 mm   433.07 ft / 132.00 m   12.73 ft / 3.88 m
   Ends:   4.72" / 120 mm   229.66 ft / 70.00 m   10.17 ft / 3.10 m
     19.69 ft / 6.00 m Unarmoured ends
   Upper:   4.72" / 120 mm   433.07 ft / 132.00 m   8.01 ft / 2.44 m
     Main Belt covers 98 % of normal length

   - Torpedo Bulkhead:
      1.77" / 45 mm   433.07 ft / 132.00 m   25.20 ft / 7.68 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   13.4" / 340 mm   7.09" / 180 mm      11.8" / 300 mm
   2nd:   3.94" / 100 mm   2.36" / 60 mm      3.15" / 80 mm
   3rd:   0.79" / 20 mm         -               -
   4th:   0.50" / 13 mm         -               -

   - Armour deck: 3.54" / 90 mm, Conning tower: 11.81" / 300 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 64 000 shp / 47 744 Kw = 24.84 kts
   Range 7 000nm at 12.00 kts
   Bunker at max displacement = 2 625 tons

Complement:
   1 141 - 1 484

Cost:
   £5.921 million / $23.683 million

Distribution of weights at normal displacement:
   Armament: 1 698 tons, 5.6 %
   Armour: 10 415 tons, 34.6 %
      - Belts: 4 363 tons, 14.5 %
      - Torpedo bulkhead: 715 tons, 2.4 %
      - Armament: 1 736 tons, 5.8 %
      - Armour Deck: 3 355 tons, 11.2 %
      - Conning Tower: 246 tons, 0.8 %
   Machinery: 2 384 tons, 7.9 %
   Hull, fittings & equipment: 12 353 tons, 41.1 %
   Fuel, ammunition & stores: 2 829 tons, 9.4 %
   Miscellaneous weights: 400 tons, 1.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     43 857 lbs / 19 893 Kg = 21.5 x 16.0 " / 406 mm shells or 7.5 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 7.4 ft / 2.3 m
   Roll period: 16.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.42
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.575
   Length to Beam Ratio: 6.50 : 1
   'Natural speed' for length: 26.12 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      26.90 ft / 8.20 m
      - Forecastle (19 %):   21.00 ft / 6.40 m
      - Mid (30 %):      17.72 ft / 5.40 m
      - Quarterdeck (18 %):   17.72 ft / 5.40 m
      - Stern:      17.72 ft / 5.40 m
      - Average freeboard:   18.97 ft / 5.78 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 86.5 %
      - Above water (accommodation/working, high = better): 153.8 %
   Waterplane Area: 51 187 Square feet or 4 755 Square metres
   Displacement factor (Displacement / loading): 103 %
   Structure weight / hull surface area: 187 lbs/sq ft or 913 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.20
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform

----------------------
AC next generation

17200T-2T3x340, Peru AC laid down 1919 (Engine 1916)

Displacement:
   17 200 t light; 18 172 t standard; 19 282 t normal; 20 171 t full load

Dimensions: Length overall / water x beam x draught
   720.26 ft / 715.22 ft x 75.30 ft x 25.06 ft (normal load)
   219.53 m / 218.00 m x 22.95 m  x 7.64 m

Armament:
      6 - 13.39" / 340 mm guns (2x3 guns), 1 200.00lbs / 544.31kg shells, 1919 Model
     Breech loading guns in turrets (on barbettes)
     on centreline, evenly spread
     Main guns limited to end-on fire
      6 - 5.98" / 152 mm guns (2x3 guns), 107.15lbs / 48.60kg shells, 1919 Model
     Breech loading guns in turrets (on barbettes)
     on centreline, evenly spread, all raised mounts
      12 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1919 Model
     Quick firing guns in casemate mounts
     on side, evenly spread
      4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1919 Model
     Quick firing guns in deck mounts
     on side, evenly spread, all raised mounts
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 8 530 lbs / 3 869 kg
   Shells per gun, main battery: 120
   8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   465.88 ft / 142.00 m   12.73 ft / 3.88 m
   Ends:   3.15" / 80 mm   223.10 ft / 68.00 m   10.17 ft / 3.10 m
     26.25 ft / 8.00 m Unarmoured ends
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   7.09" / 180 mm   4.72" / 120 mm      6.30" / 160 mm
   2nd:   3.94" / 100 mm   2.36" / 60 mm      3.15" / 80 mm
   3rd:   0.79" / 20 mm         -               -
   4th:   0.50" / 13 mm         -               -

   - Armour deck: 1.97" / 50 mm, Conning tower: 7.09" / 180 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 90 000 shp / 67 140 Kw = 29.84 kts
   Range 7 000nm at 12.00 kts
   Bunker at max displacement = 1 999 tons

Complement:
   817 - 1 063

Cost:
   £4.291 million / $17.163 million

Distribution of weights at normal displacement:
   Armament: 1 066 tons, 5.5 %
   Armour: 3 777 tons, 19.6 %
      - Belts: 1 435 tons, 7.4 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 925 tons, 4.8 %
      - Armour Deck: 1 307 tons, 6.8 %
      - Conning Tower: 110 tons, 0.6 %
   Machinery: 3 353 tons, 17.4 %
   Hull, fittings & equipment: 8 704 tons, 45.1 %
   Fuel, ammunition & stores: 2 082 tons, 10.8 %
   Miscellaneous weights: 300 tons, 1.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     20 019 lbs / 9 081 Kg = 16.7 x 13.4 " / 340 mm shells or 2.0 torpedoes
   Stability (Unstable if below 1.00): 1.06
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 16.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 1.00
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.500
   Length to Beam Ratio: 9.50 : 1
   'Natural speed' for length: 26.74 kts
   Power going to wave formation at top speed: 48 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   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:      28.54 ft / 8.70 m
      - Forecastle (19 %):   21.98 ft / 6.70 m
      - Mid (40 %):      18.70 ft / 5.70 m
      - Quarterdeck (18 %):   18.70 ft / 5.70 m
      - Stern:      18.70 ft / 5.70 m
      - Average freeboard:   20.17 ft / 6.15 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.1 %
      - Above water (accommodation/working, high = better): 144.5 %
   Waterplane Area: 35 881 Square feet or 3 333 Square metres
   Displacement factor (Displacement / loading): 100 %
   Structure weight / hull surface area: 160 lbs/sq ft or 779 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.23
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[P3D]

The BB has too shallow draught and too long and beamy. Do you have a requirement for it to be < 8m?

Rules allow turreted 6" in 1921 earliest.

The AC is much better balanced, but. The hull is very narrow and very fine, IMO the triple 340mm turrets would not fit there (Panzerschiff: 71' beam). Same on the 6" turrets.

Range should be increased. Both scouting  for the battleline, or independent operations, would require longer range compared to a battleship.

[maddox]

The BB is nicely inside the rules concerning beam ratio 6.5/1. 
She's narrow compared to the French BB's.
The length, only dockspace is the limiting factor there, she takes a type 3 dock.
And about draught,  the designers of her could be worrying over certain areas where the ships could be used.
Or, maybe certain docks for Peru aren't as deep.