Vilnius Union Ships, 1920+: Electric Drive Boogaloo

[The Rock Doctor]

Recognizing that it may be "too soon" from an out-of-character perspective, given the recent accident in the Atlantic, there is nonetheless an in-character utility in acquiring a dedicated submarine rescue ship.

This class would embark divers, diving bells, decompression chambers, extra cranes and other stuff associated with getting people safely out of a disabled submarine.  There would also be some medical facilities to observe and treat survivors or the ship's own diving complement.  It would not be capable of actually retrieving a submarine, though, a heavier crane ship would be needed for that.

When not dealing with accidents or training for accidents, the class can also be used to work around wrecks (investigating/charting/demolishing), surveying, torpedo recovery, and that sort of thing.

Armament is very modest and defensive in nature.  Speed/range is primarily to allow a rapid-ish transit from home port to an accident site.  The build would be to civilian specs.

From a numbers perspective, most Union submarines are in European or Caribbean waters so a unit in each would make some sense.  A third unit might be good to have some back-up coverage.

Submarine rescue ship, laid down 1927

Displacement:
   1,129 t light; 1,166 t standard; 1,355 t normal; 1,507 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (252.64 ft / 242.78 ft) x 36.09 ft x (9.84 / 10.71 ft)
   (77.01 m / 74.00 m) x 11.00 m  x (3.00 / 3.26 m)

Armament:
      1 - 3.94" / 100.0 mm 45.0 cal gun - 30.77lbs / 13.96kg shells, 250 per gun
     Quick firing gun in deck mount, 1927 Model
     1 x Single mount on centreline, forward deck forward
      1 raised mount
      1 - 3.94" / 100.0 mm 45.0 cal gun - 30.77lbs / 13.96kg shells, 250 per gun
     Anti-air gun in deck mount, 1927 Model
     1 x Single mount on centreline, aft deck centre
      1 raised mount
      4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1927 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 62 lbs / 28 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.59" / 15 mm            -
   2nd:   0.79" / 20 mm   0.59" / 15 mm            -
   3rd:   0.59" / 15 mm         -               -

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 2 shafts, 5,899 shp / 4,400 Kw = 20.09 kts
   Range 3,000nm at 16.90 kts
   Bunker at max displacement = 341 tons

Complement:
   111 - 145

Cost:
   £0.250 million / $1.000 million

Distribution of weights at normal displacement:
   Armament: 12 tons, 0.9 %
   Armour: 11 tons, 0.8 %
      - Armament: 11 tons, 0.8 %
   Machinery: 186 tons, 13.7 %
   Hull, fittings & equipment: 462 tons, 34.1 %
   Fuel, ammunition & stores: 226 tons, 16.7 %
   Miscellaneous weights: 458 tons, 33.8 %
      - Hull below water: 127 tons
      - Hull above water: 100 tons
      - On freeboard deck: 194 tons
      - Above deck: 37 tons

Fittings:
-25 t:  L/R wireless (AD)
-10 t:  Lighting/nightfighting doodads (AD)
-2 t:  1918 fire control (AD)
-14 t:  Weight reserve (FD)
-180 t:  Extra cranes, operations space, and other mission-themed stuff (FD)
-30 t:  Cargo hold (Diving bells, etc) (AW)
-70 t:  Decompression chamber, medical facilities (AW)
-102 t:  Diesel-electric machinery (BW)
-25 t:  Sonar and enhanced hydrophone package (BW)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,146 lbs / 1,427 Kg = 103.1 x 3.9 " / 100 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality  (Average = 1.00): 1.59

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.562
   Length to Beam Ratio: 6.73 : 1
   'Natural speed' for length: 15.58 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 44
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  18.70 ft / 5.70 m,  13.78 ft / 4.20 m
      - Forward deck:   30.00 %,  13.78 ft / 4.20 m,  13.78 ft / 4.20 m
      - Aft deck:   35.00 %,  13.78 ft / 4.20 m,  13.78 ft / 4.20 m
      - Quarter deck:   15.00 %,  13.78 ft / 4.20 m,  13.78 ft / 4.20 m
      - Average freeboard:      14.17 ft / 4.32 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 66.5 %
      - Above water (accommodation/working, high = better): 144.6 %
   Waterplane Area: 6,115 Square feet or 568 Square metres
   Displacement factor (Displacement / loading): 156 %
   Structure weight / hull surface area: 46 lbs/sq ft or 223 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.87
      - Longitudinal: 3.50
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

D-E engines add 90% to range, so:

22,800 @ 10 kts
8,000 @ 15 kts
5,700 @ 16.92 kts (half power)
3,400 @ 20 kts

[The Rock Doctor]

A big torpedo-boat intended for small-ship combat operations in the North Sea and Baltic alongside the Swarm.  Notionally it'd have about the same kit as a U or W class ship, but maybe two more torpedoes.

Enter ship name, Enter country Enter ship type laid down 1928

Displacement:
   2,484 t light; 2,615 t standard; 2,931 t normal; 3,183 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (436.30 ft / 417.98 ft) x 38.71 ft x (15.09 / 15.97 ft)
   (132.98 m / 127.40 m) x 11.80 m  x (4.60 / 4.87 m)

Armament:
      6 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 300 per gun
     Quick firing guns in deck and hoist mounts, 1928 Model
     2 x 2-gun mounts on centreline, forward evenly spread
      1 raised mount
     1 x 2-gun mount on centreline, aft deck centre
      4 - 1.97" / 50.0 mm 45.0 cal guns - 3.85lbs / 1.74kg shells, 300 per gun
     Anti-air guns in deck mounts, 1928 Model
     4 x Single mounts on sides, evenly spread
      8 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1928 Model
     4 x Twin mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 422 lbs / 191 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   1.18" / 30 mm      1.97" / 50 mm
   3rd:   0.79" / 20 mm   0.59" / 15 mm            -
   4th:   0.59" / 15 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 53,619 shp / 40,000 Kw = 33.61 kts
   Range 12,000nm at 10.00 kts
   Bunker at max displacement = 567 tons

Complement:
   198 - 258

Cost:
   £1.276 million / $5.104 million

Distribution of weights at normal displacement:
   Armament: 113 tons, 3.9 %
   Armour: 49 tons, 1.7 %
      - Armament: 49 tons, 1.7 %
   Machinery: 1,481 tons, 50.5 %
   Hull, fittings & equipment: 697 tons, 23.8 %
   Fuel, ammunition & stores: 446 tons, 15.2 %
   Miscellaneous weights: 144 tons, 4.9 %
      - Hull below water: 25 tons
      - On freeboard deck: 69 tons
      - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     667 lbs / 303 Kg = 10.0 x 5.1 " / 130 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.12
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 13.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.53
   Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.420 / 0.431
   Length to Beam Ratio: 10.80 : 1
   'Natural speed' for length: 20.44 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 66
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 9.84 ft / 3.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  23.29 ft / 7.10 m,  19.36 ft / 5.90 m
      - Forward deck:   30.00 %,  19.36 ft / 5.90 m,  19.36 ft / 5.90 m
      - Aft deck:   35.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Average freeboard:      15.73 ft / 4.80 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 178.0 %
      - Above water (accommodation/working, high = better): 146.7 %
   Waterplane Area: 10,088 Square feet or 937 Square metres
   Displacement factor (Displacement / loading): 75 %
   Structure weight / hull surface area: 39 lbs/sq ft or 191 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.35
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform

[The Rock Doctor]

A wee light cruiser in the Arethusa style.  Don't think it ticks my boxes but was amusing to sim.

Enter ship name, Enter country Enter ship type laid down 1928

Displacement:
   5,381 t light; 5,613 t standard; 6,290 t normal; 6,832 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (519.26 ft / 505.25 ft) x 52.49 ft x (18.04 / 19.16 ft)
   (158.27 m / 154.00 m) x 16.00 m  x (5.50 / 5.84 m)

Armament:
      6 - 5.91" / 150 mm 45.0 cal guns - 103.86lbs / 47.11kg shells, 250 per gun
     Breech loading guns in turret on barbette mounts, 1928 Model
     3 x 2-gun mounts on centreline ends, majority forward
      1 raised mount - superfiring
      4 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Anti-air guns in deck mounts, 1928 Model
     4 x Single mounts on centreline, aft evenly spread
      8 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Breech loading guns in deck mounts, 1928 Model
     4 x Twin mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 747 lbs / 339 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   0.98" / 25 mm   393.70 ft / 120.00 m   11.81 ft / 3.60 m
   Ends:   Unarmoured
     Main Belt covers 120 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   0.98" / 25 mm      1.97" / 50 mm
   2nd:   0.79" / 20 mm   0.59" / 15 mm            -
   3rd:   0.59" / 15 mm         -               -

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

   - Conning towers: Forward 0.98" / 25 mm,  Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 67,024 shp / 50,000 Kw = 32.02 kts
   Range 16,400nm at 10.00 kts
   Bunker at max displacement = 1,219 tons

Complement:
   353 - 459

Cost:
   £2.084 million / $8.335 million

Distribution of weights at normal displacement:
   Armament: 201 tons, 3.2 %
   Armour: 618 tons, 9.8 %
      - Belts: 183 tons, 2.9 %
      - Armament: 115 tons, 1.8 %
      - Armour Deck: 313 tons, 5.0 %
      - Conning Tower: 7 tons, 0.1 %
   Machinery: 2,087 tons, 33.2 %
   Hull, fittings & equipment: 2,350 tons, 37.4 %
   Fuel, ammunition & stores: 909 tons, 14.4 %
   Miscellaneous weights: 125 tons, 2.0 %
      - On freeboard deck: 60 tons
      - Above deck: 65 tons

Fittings:
-20 t:  Fire control (AD)
-25 t:  L/R wireless (AD)
-10 t:  Nightfighting doodads (AD)
-30 t:  Armed scoutplane and catapult (FD)
-24 t:  2x3 530mm torpedo carriages (FD)
-16 t:  Weight reserve (AD/FD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,648 lbs / 2,562 Kg = 54.8 x 5.9 " / 150 mm shells or 1.0 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 2.3 ft / 0.7 m
   Roll period: 14.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.36
   Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.460 / 0.471
   Length to Beam Ratio: 9.63 : 1
   'Natural speed' for length: 22.48 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 67
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 4.92 ft / 1.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  24.97 ft / 7.61 m,  20.01 ft / 6.10 m
      - Forward deck:   50.00 %,  20.01 ft / 6.10 m,  20.01 ft / 6.10 m
      - Aft deck:   15.00 %,  12.14 ft / 3.70 m,  12.14 ft / 3.70 m
      - Quarter deck:   15.00 %,  12.14 ft / 3.70 m,  12.14 ft / 3.70 m
      - Average freeboard:      18.05 ft / 5.50 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 118.2 %
      - Above water (accommodation/working, high = better): 167.5 %
   Waterplane Area: 17,059 Square feet or 1,585 Square metres
   Displacement factor (Displacement / loading): 114 %
   Structure weight / hull surface area: 87 lbs/sq ft or 426 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 1.63
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform

[TacCovert4]

Eeep that armor.

[The Rock Doctor]

I know, right?  I did a version where I just skipped the belt and deck entirely and shaved the hull down to around 4,100 t. 

Not that I seem likely to build that variant either.

[Jefgte]

If you raise it to 6000t, it will have more serious armor.

[The Rock Doctor]

This is undoubtedly true.

[The Rock Doctor]

The 1928 Emergency Battleship is technically over its maximum light displacement, but on the other hand, everybody who's seen the sketch agrees that it doesn't look as dorky as the 1924 Emergency Battleship.  Let's be honest, it's a big-ass monitor.

There's a different emphasis on deck versus belt armor, and there won't be much running away with all the big guns forward.

Enter ship name, Enter country Enter ship type laid down 1928

Displacement:
   15,547 t light; 16,447 t standard; 17,775 t normal; 18,837 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (448.35 ft / 433.07 ft) x 95.14 ft x (25.59 / 26.84 ft)
   (136.66 m / 132.00 m) x 29.00 m  x (7.80 / 8.18 m)

Armament:
      6 - 13.78" / 350 mm 45.0 cal guns - 1,319.35lbs / 598.45kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1928 Model
     2 x 3-gun mounts on centreline, forward evenly spread
      1 raised mount
      8 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1928 Model
     4 x 2-gun mounts on sides, evenly spread
      6 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Anti-air guns in deck mounts, 1928 Model
     4 x Single mounts on sides, aft deck forward
      4 raised mounts - superfiring
     2 x Single mounts on sides, forward deck aft
      16 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1928 Model
     8 x Twin mounts on sides, evenly spread
      8 raised mounts
      Weight of broadside 8,644 lbs / 3,921 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.87" / 200 mm   281.50 ft / 85.80 m   16.37 ft / 4.99 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead:
      1.57" / 40 mm   281.50 ft / 85.80 m   23.79 ft / 7.25 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.7" / 400 mm   7.87" / 200 mm      13.8" / 350 mm
   2nd:   1.97" / 50 mm   1.18" / 30 mm      1.97" / 50 mm
   3rd:   0.79" / 20 mm   0.59" / 15 mm            -
   4th:   0.59" / 15 mm         -               -

   - Armoured deck - multiple decks: 3.94" / 100 mm For and Aft decks
   Forecastle: 1.97" / 50 mm  Quarter deck: 3.94" / 100 mm

   - Conning towers: Forward 13.78" / 350 mm,  Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 29,490 shp / 22,000 Kw = 21.05 kts
   Range 18,000nm at 10.00 kts
   Bunker at max displacement = 2,390 tons

Complement:
   769 - 1,000

Cost:
   £5.621 million / $22.484 million

Distribution of weights at normal displacement:
   Armament: 1,836 tons, 10.3 %
   Armour: 6,131 tons, 34.5 %
      - Belts: 1,682 tons, 9.5 %
      - Torpedo bulkhead: 390 tons, 2.2 %
      - Armament: 1,761 tons, 9.9 %
      - Armour Deck: 2,095 tons, 11.8 %
      - Conning Tower: 202 tons, 1.1 %
   Machinery: 918 tons, 5.2 %
   Hull, fittings & equipment: 6,224 tons, 35.0 %
   Fuel, ammunition & stores: 2,228 tons, 12.5 %
   Miscellaneous weights: 438 tons, 2.5 %
      - On freeboard deck: 138 tons
      - Above deck: 300 tons

Fittings:
-184 t:  Fire control (AD)
-25 t:  L/R wireless (AD)
-25 t:  Night-fighting doodads (AD)
-50 t:  Flag facilities (AD/FD))
-30 t:  Single scout plane and catapult (FD)
-41 + 83 t:  Weight reserve

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     29,513 lbs / 13,387 Kg = 22.6 x 13.8 " / 350 mm shells or 6.3 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 6.0 ft / 1.8 m
   Roll period: 16.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.49
   Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.590 / 0.596
   Length to Beam Ratio: 4.55 : 1
   'Natural speed' for length: 20.81 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 62
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  23.95 ft / 7.30 m,  20.01 ft / 6.10 m
      - Forward deck:   40.00 %,  20.01 ft / 6.10 m,  20.01 ft / 6.10 m
      - Aft deck:   25.00 %,  12.14 ft / 3.70 m,  12.14 ft / 3.70 m
      - Quarter deck:   15.00 %,  12.14 ft / 3.70 m,  12.14 ft / 3.70 m
      - Average freeboard:      17.18 ft / 5.24 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 73.9 %
      - Above water (accommodation/working, high = better): 125.6 %
   Waterplane Area: 29,855 Square feet or 2,774 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 181 lbs/sq ft or 885 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.73
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform

[The Rock Doctor]

More or less the 1925 CL, but with a hypothetical 170mm main battery that doesn't exist just yet.

I suppose with 150mm and 200mm guns in service, maybe the Union would split the difference and go with a 175 instead. 

Enter ship name, Enter country Enter ship type laid down 1927

Displacement:
   7,940 t light; 8,314 t standard; 9,283 t normal; 10,058 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (593.66 ft / 577.43 ft) x 57.74 ft x (21.65 / 22.93 ft)
   (180.95 m / 176.00 m) x 17.60 m  x (6.60 / 6.99 m)

Armament:
      8 - 6.69" / 170 mm 45.0 cal guns - 151.18lbs / 68.58kg shells, 250 per gun
     Breech loading guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      4 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      12 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1927 Model
     6 x Twin mounts on sides amidships
      6 raised mounts
      Weight of broadside 1,334 lbs / 605 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   387.14 ft / 118.00 m   16.37 ft / 4.99 m
   Ends:   Unarmoured
     Main Belt covers 103 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm   1.97" / 50 mm      2.95" / 75 mm
   2nd:   0.79" / 20 mm   0.59" / 15 mm            -
   3rd:   0.59" / 15 mm         -               -

   - Armoured deck - multiple decks: 1.57" / 40 mm For and Aft decks
   Forecastle: 1.57" / 40 mm  Quarter deck: 1.57" / 40 mm

   - Conning towers: Forward 3.94" / 100 mm,  Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 80,429 shp / 60,000 Kw = 32.09 kts
   Range 18,000nm at 10.00 kts
   Bunker at max displacement = 1,744 tons

Complement:
   472 - 614

Cost:
   £2.763 million / $11.051 million

Distribution of weights at normal displacement:
   Armament: 354 tons, 3.8 %
   Armour: 1,789 tons, 19.3 %
      - Belts: 1,015 tons, 10.9 %
      - Armament: 112 tons, 1.2 %
      - Armour Deck: 625 tons, 6.7 %
      - Conning Tower: 37 tons, 0.4 %
   Machinery: 2,539 tons, 27.4 %
   Hull, fittings & equipment: 2,911 tons, 31.4 %
   Fuel, ammunition & stores: 1,343 tons, 14.5 %
   Miscellaneous weights: 347 tons, 3.7 %
      - On freeboard deck: 147 tons
      - Above deck: 200 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     8,905 lbs / 4,039 Kg = 59.4 x 6.7 " / 170 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 2.7 ft / 0.8 m
   Roll period: 14.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.43
   Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.450 / 0.460
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 24.03 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 55
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  26.57 ft / 8.10 m,  21.65 ft / 6.60 m
      - Forward deck:   30.00 %,  21.65 ft / 6.60 m,  21.65 ft / 6.60 m
      - Aft deck:   35.00 %,  13.78 ft / 4.20 m,  13.78 ft / 4.20 m
      - Quarter deck:   15.00 %,  13.78 ft / 4.20 m,  13.78 ft / 4.20 m
      - Average freeboard:      18.11 ft / 5.52 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102.6 %
      - Above water (accommodation/working, high = better): 149.5 %
   Waterplane Area: 21,268 Square feet or 1,976 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 89 lbs/sq ft or 434 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 1.25
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

[Kaiser Kirk]

Sorry we don't have more recent Norse ships for you to design against.
Looking at my designs vs. this, the OPFOR's designs matter.
But compared to Snip's Messana class, you have a similar main gun,
but better belt/deck on the same tonnage...but more speed.
And speed is a real tonnage eater on these.

The 170/175 range is interesting.
The Germans had some 170mm secondaries, and they worked, but were considered
a little heavy. The French had a bunch of 164mm.
The next tier up was the top of the handworked guns the 194s/190s
and we know they retrofitted the Hawkins guns with power assist to help there.
That's why I have the smaller-but-should be more workable 180s...which the Aztec and Romans now have.

If the gun isn't around yet, I'd put the build date at +2 years
and see what the engine savings get you.

[The Rock Doctor]

Fair point, and I guess I'd be looking at a 1930 design if that were done.  It would probably gain me 10mm of deck armor or such.

But I'm not really likely to go down this path, I don't think.  Suspect I'm sticking with a "capital ship - cruiser killer/armored cruiser - light cruiser" force mix.

[The Rock Doctor]

A further refinement of the riverine seaplane carrier.

This one has capacity for six aircraft - definitely four in the hanger, with external deckspace for a couple more. 

While I've kept the general configuration of preceding types, there's a case to be made for shifting the hanger forward and having the catapult, recovery ramp, and deckpark as one long stretch on the aft half of the hull.

Don't expect I'll build it, but it's fun to play with.

Enter ship name, Enter country Enter ship type laid down 1927

Displacement:
   924 t light; 949 t standard; 980 t normal; 1,004 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (325.41 ft / 318.24 ft) x 45.93 ft x (3.61 / 3.69 ft)
   (99.18 m / 97.00 m) x 14.00 m  x (1.10 / 1.12 m)

Armament:
      1 - 2.95" / 75.0 mm 45.0 cal gun - 12.98lbs / 5.89kg shells, 250 per gun
     Quick firing gun in deck mount, 1927 Model
     1 x Single mount on centreline, forward deck forward
      1 raised mount
      2 - 1.97" / 50.0 mm 45.0 cal guns - 3.85lbs / 1.74kg shells, 250 per gun
     Anti-air guns in deck mounts, 1927 Model
     2 x Single mounts on sides amidships
      2 raised mounts
      8 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1927 Model
     4 x Twin mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 22 lbs / 10 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.59" / 15 mm            -
   2nd:   0.79" / 20 mm   0.59" / 15 mm            -
   3rd:   0.59" / 15 mm         -               -

   - Box over machinery & magazines: 0.98" / 25 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

Machinery:
   Diesel Internal combustion motors,
   Electric cruising motors plus geared drives, 2 shafts, 939 shp / 700 Kw = 12.23 kts
   Range 1,500nm at 10.00 kts
   Bunker at max displacement = 55 tons

Complement:
   86 - 113

Cost:
   £0.138 million / $0.552 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 0.5 %
   Armour: 89 tons, 9.1 %
      - Armament: 14 tons, 1.4 %
      - Armour Deck: 76 tons, 7.7 %
   Machinery: 30 tons, 3.0 %
   Hull, fittings & equipment: 453 tons, 46.3 %
   Fuel, ammunition & stores: 55 tons, 5.7 %
   Miscellaneous weights: 347 tons, 35.4 %
      - Hull below water: 92 tons
      - Hull above water: 75 tons
      - On freeboard deck: 90 tons
      - Above deck: 90 tons

Fittings:
-150 t:  Facilities for six armed floatplanes (BW/AW)
-5 t:  Catapult (FD)
-17 t:  Diesel-electric machinery (BW)
-50 t:  Flight operations (AD)
-25 t:  L/R wireless (AD)
-10 t:  Extra S/R wireless (AD)
-90 t:  Weight reserve (almost entirely FD)


Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,031 lbs / 2,735 Kg = 468.5 x 3.0 " / 75 mm shells or 3.4 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 13.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 90 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
   Hull has raised forecastle, low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.650 / 0.652
   Length to Beam Ratio: 6.93 : 1
   'Natural speed' for length: 17.84 kts
   Power going to wave formation at top speed: 21 %
   Trim (Max stability = 0, Max steadiness = 100): 84
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: -11.81 ft / -3.60 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Forward deck:   30.00 %,  11.81 ft / 3.60 m,  11.81 ft / 3.60 m
      - Aft deck:   35.00 %,  11.81 ft / 3.60 m,  11.81 ft / 3.60 m
      - Quarter deck:   15.00 %,  3.94 ft / 1.20 m,  3.94 ft / 1.20 m
      - Average freeboard:      12.20 ft / 3.72 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 31.7 %
      - Above water (accommodation/working, high = better): 292.9 %
   Waterplane Area: 11,198 Square feet or 1,040 Square metres
   Displacement factor (Displacement / loading): 192 %
   Structure weight / hull surface area: 34 lbs/sq ft or 164 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.73
      - Longitudinal: 0.97
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform

[The Rock Doctor]

The Oyono class light cruisers are slightly larger than the preceding Volkhov class, mainly to allow for incrementally better protection.  Visually they're similar enough that I won't bother sketching them.

The Union would like to get to the point where it can lay down a new light cruiser every six months, until the heat death of the universe, but it's not 100% certain that the Union's BP count is up to that task along with all the other stuff the Union wants to build.

Enter ship name, Enter country Enter ship type laid down 1927

Displacement:
   8,294 t light; 8,629 t standard; 9,531 t normal; 10,252 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (595.30 ft / 580.71 ft) x 58.07 ft x (21.98 / 23.16 ft)
   (181.45 m / 177.00 m) x 17.70 m  x (6.70 / 7.06 m)

Armament:
      8 - 5.91" / 150 mm 45.0 cal guns - 103.86lbs / 47.11kg shells, 250 per gun
     Breech loading guns in turret on barbette mounts, 1927 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      6 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Anti-air guns in deck mounts, 1927 Model
     6 x Single mounts on side ends, majority forward
      12 - 0.59" / 15.0 mm 45.0 cal guns - 0.10lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1927 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
     4 x Twin mounts on sides amidships
      4 double raised mounts
      Weight of broadside 1,017 lbs / 461 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   377.46 ft / 115.05 m   16.37 ft / 4.99 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.91" / 150 mm   1.57" / 40 mm      3.94" / 100 mm
   2nd:   0.79" / 20 mm   0.79" / 20 mm            -
   3rd:   0.59" / 15 mm         -               -

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

   - Conning towers: Forward 3.94" / 100 mm,  Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 81,770 shp / 61,000 Kw = 32.11 kts
   Range 16,400nm at 10.00 kts
   Bunker at max displacement = 1,624 tons

Complement:
   481 - 626

Cost:
   £2.689 million / $10.755 million

Distribution of weights at normal displacement:
   Armament: 272 tons, 2.9 %
   Armour: 1,950 tons, 20.5 %
      - Belts: 995 tons, 10.4 %
      - Armament: 286 tons, 3.0 %
      - Armour Deck: 632 tons, 6.6 %
      - Conning Tower: 38 tons, 0.4 %
   Machinery: 2,581 tons, 27.1 %
   Hull, fittings & equipment: 3,251 tons, 34.1 %
   Fuel, ammunition & stores: 1,236 tons, 13.0 %
   Miscellaneous weights: 240 tons, 2.5 %
      - On freeboard deck: 100 tons
      - Above deck: 140 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10,787 lbs / 4,893 Kg = 104.8 x 5.9 " / 150 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 2.6 ft / 0.8 m
   Roll period: 15.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.30
   Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.450 / 0.460
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 24.10 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 56
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 4.92 ft / 1.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  26.57 ft / 8.10 m,  21.65 ft / 6.60 m
      - Forward deck:   30.00 %,  21.65 ft / 6.60 m,  21.65 ft / 6.60 m
      - Aft deck:   35.00 %,  13.78 ft / 4.20 m,  13.78 ft / 4.20 m
      - Quarter deck:   15.00 %,  13.78 ft / 4.20 m,  13.78 ft / 4.20 m
      - Average freeboard:      18.11 ft / 5.52 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 97.6 %
      - Above water (accommodation/working, high = better): 148.3 %
   Waterplane Area: 21,510 Square feet or 1,998 Square metres
   Displacement factor (Displacement / loading): 116 %
   Structure weight / hull surface area: 96 lbs/sq ft or 471 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.32
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

960nm @ 32 kts
1170nm @ 30 kts
1960nm @ 25 kts
3510nm @ 20 kts
6930nm @ 15 kts

[The Rock Doctor]

...And now the governors of Orimirilandia and Srebrny Rzeki are like, "Hey, we've got a lot of coast and big rivers that we need to travel on sometimes, too, you know?"

So they get yachts too.  These ones are shallow-draft to allow riverine use, but are strudy enough for runs up and down the immediate coast as well.  Reflecting the always-warm climates of these territories, there's a big raised quarterdeck that can be covered over with awnings for outdoor entertaining/working.

While a smaller vessel overall compared to the two ocean-going yachts, the installed machinery is much lighter and the room for actual fittings is in fact slightly superior as a result.

The Governor of Bermudez laughed at the idea of needing a yacht, his colleague in North Eryka far prefers to travel by rail, and the Governor of Papuzek said it can wait for another time when you get bored and want to design a different ship.

Enter ship name, Enter country Enter ship type laid down 1928

Displacement:
   168 t light; 171 t standard; 175 t normal; 178 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (156.68 ft / 147.64 ft) x 22.97 ft x (3.28 / 3.32 ft)
   (47.76 m / 45.00 m) x 7.00 m  x (1.00 / 1.01 m)

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 2 shafts, 302 shp / 225 Kw = 12.24 kts
   Range 500nm at 10.00 kts
   Bunker at max displacement = 6 tons

Complement:
   23 - 31

Cost:
   £0.027 million / $0.110 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 9 tons, 5.4 %
   Hull, fittings & equipment: 72 tons, 40.9 %
   Fuel, ammunition & stores: 7 tons, 3.9 %
   Miscellaneous weights: 87 tons, 49.8 %
      - Hull below water: 5 tons
      - Hull above water: 40 tons
      - On freeboard deck: 42 tons

Fittings:
-10 t:  Governor's suite (FD)
-20 t:  Dining room/amenities (FD)
-10 t:  Staff workspace (FD)
-2 t:  Deck cargo and small crane (FD)
-10 t:  Guest suites for two (AW)
-8 t:  Cabins for two senior staff (AW)
-16 t:  Berthing for eight junior staff (AW)
-5 t:  Additional workspace (AW)
-1 t:  Stowed cargo/luggage (AW)
-5 t:  Diesel-electric machinery (BW)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     717 lbs / 325 Kg = 6.6 x 6 " / 152 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 11.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 90 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.552
   Length to Beam Ratio: 6.43 : 1
   'Natural speed' for length: 12.15 kts
   Power going to wave formation at top speed: 42 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 2.95 ft / 0.90 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  16.73 ft / 5.10 m,  13.78 ft / 4.20 m
      - Forward deck:   30.00 %,  13.78 ft / 4.20 m,  13.78 ft / 4.20 m
      - Aft deck:   35.00 %,  5.91 ft / 1.80 m,  5.91 ft / 1.80 m
      - Quarter deck:   15.00 %,  5.91 ft / 1.80 m,  5.91 ft / 1.80 m
      - Average freeboard:      10.08 ft / 3.07 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 46.7 %
      - Above water (accommodation/working, high = better): 186.9 %
   Waterplane Area: 2,366 Square feet or 220 Square metres
   Displacement factor (Displacement / loading): 165 %
   Structure weight / hull surface area: 18 lbs/sq ft or 87 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.61
      - Longitudinal: 4.37
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, rides out heavy weather easily

[The Rock Doctor]

Options for a 1928 razee/armored cruiser, all of which would carry 300mm/45 guns in 2-gun turrets plus a 6x2 130mm secondary.  The general role remains the same:  Cruiser-killing in trade protection roles and fleeting scouting. 

Sim B:  18,600 t; 6 guns; B150/D75, 31.89 knots.  Basically a newer Straznik.  Size range precludes torpedo bulkhead.

Sim C:  18,600 t; 6 guns; B170/D75, 31.89 knots.  Squeeze out a bit more belt armor through misc. weight

Sim D:  18,848 t; 6 guns; B200/D75, 31.89 knots.  Sim E looks a lot like D.

Sim F:  22,732 t; 8 guns; B200/D75/TB25, 31.94 knots. 

Sim G has an all-forward main battery A-Bs-C-Ds, at the cost of lower seakeeping, but otherwise resembles Sim F.

Sim A:  24,119 t; 8 guns; B200/D90/TB40, 31.87 knots.

Sim H:  23,331 t; 6x350/45 guns; B200/D90/TB25, 32 knots.

Notes:

-I don't have a 3-gun 300mm, but could introduce one for a 2H1929 lay-down.

-I think I'll have a 250/50cal in service for 1930 as an alternative.