Byzantine Empire 1923-1924...

Jefgte · May 20, 2022, 04:08:16 PM

I like this one with Hawkins & Hood guns

C9, Byzantine Empire C9-7800t laid down 1924

Displacement:
   7 800 t light; 8 218 t standard; 9 013 t normal; 9 649 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (559,80 ft / 557,74 ft) x 62,34 ft x (18,15 / 19,11 ft)
   (170,63 m / 170,00 m) x 19,00 m x (5,53 / 5,82 m)

Armament:
6 - 7,52" / 191 mm 45,0 cal guns - 214,42lbs / 97,26kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1924 Model
     2 x 3-gun mounts on centreline ends, evenly spread
12 - 5,51" / 140 mm 50,0 cal guns - 88,63lbs / 40,20kg shells, 200 per gun
     Breech loading guns in deck and hoist mounts, 1924 Model
     6 x 2-gun mounts on sides, evenly spread
4 - 3,00" / 76,2 mm 45,0 cal guns - 13,62lbs / 6,18kg shells, 250 per gun
     Anti-air guns in deck mounts, 1924 Model
     4 x Single mounts on side ends, evenly spread
      4 raised mounts
8 - 1,85" / 47,0 mm 45,0 cal guns - 3,19lbs / 1,45kg shells, 300 per gun
     Quick firing guns in deck mounts, 1924 Model
     8 x Single mounts on side ends, evenly spread
      8 raised mounts
4 - 0,30" / 7,7 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 4 000 per gun
     Machine guns in deck mounts, 1924 Model
     4 x Single mounts on side ends, evenly spread
      4 raised mounts
Weight of broadside 2 430 lbs / 1 102 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3,94" / 100 mm   360,89 ft / 110,00 m   9,84 ft / 3,00 m
   Ends:   1,38" / 35 mm   196,85 ft / 60,00 m   9,02 ft / 2,75 m
     Main Belt covers 100 % of normal length

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5,91" / 150 mm   2,76" / 70 mm      4,72" / 120 mm
   3rd:   0,78" / 20 mm     -           -
   4th:   0,39" / 10 mm     -           -
   5th:   0,39" / 10 mm     -           -

- Protected deck - single deck:
   For and Aft decks: 1,57" / 40 mm
   Forecastle: 0,98" / 25 mm Quarter deck: 0,98" / 25 mm

- Conning towers: Forward 3,54" / 90 mm, Aft 2,76" / 70 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 56 000 shp / 41 776 Kw = 29,06 kts
   Range 10 000nm at 12 kts
7130nm at 14 kts
5250nm at 16 kts

   Bunker at max displacement = 1 431 tons

Complement:
   462 - 601

Cost:
   £2,375 million / $9,500 million

Distribution of weights at normal displacement:
   Armament: 694 tons, 7,7 %
     - Guns: 694 tons, 7,7 %
   Armour: 1 616 tons, 17,9 %
     - Belts: 671 tons, 7,4 %
     - Armament: 255 tons, 2,8 %
     - Armour Deck: 632 tons, 7,0 %
     - Conning Towers: 59 tons, 0,7 %
   Machinery: 1 845 tons, 20,5 %
   Hull, fittings & equipment: 3 373 tons, 37,4 %
   Fuel, ammunition & stores: 1 213 tons, 13,5 %
   Miscellaneous weights: 272 tons, 3,0 %
     - Hull below water: 30 tons
     - Hull above water: 30 tons
     - On freeboard deck: 117 tons
     - Above deck: 95 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11 953 lbs / 5 422 Kg = 56,2 x 7,5 " / 191 mm shells or 1,7 torpedoes
   Stability (Unstable if below 1.00): 1,10
   Metacentric height 3,0 ft / 0,9 m
   Roll period: 15,2 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0,58
   Seaboat quality (Average = 1.00): 1,18

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0,500 / 0,508
   Length to Beam Ratio: 8,95 : 1
   'Natural speed' for length: 23,62 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): 5,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   17,50 %, 23,46 ft / 7,15 m, 20,51 ft / 6,25 m
     - Forward deck:   32,50 %, 20,51 ft / 6,25 m, 17,55 ft / 5,35 m
     - Aft deck:   32,50 %, 17,55 ft / 5,35 m, 17,55 ft / 5,35 m
     - Quarter deck:   17,50 %, 17,55 ft / 5,35 m, 17,55 ft / 5,35 m
     - Average freeboard:      18,76 ft / 5,72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 92,3 %
      - Above water (accommodation/working, high = better): 174,7 %
   Waterplane Area: 23 165 Square feet or 2 152 Square metres
   Displacement factor (Displacement / loading): 115 %
   Structure weight / hull surface area: 108 lbs/sq ft or 526 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,96
      - Longitudinal: 1,37
      - Overall: 1,00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

25t for Long Range Marconi
70t for top mast rangefinder - FC1918
30t for climatisation
30t for additionnal pumps
32t for 8TTx21" HW
60t for 2x30 minen
25t reserved

Kaiser Kirk · May 24, 2022, 11:22:27 AM

Quote from: Jefgte on May 20, 2022, 04:08:16 PM
I like this one with Hawkins & Hood guns

C9, Byzantine Empire C9-7800t laid down 1924

Armament:
6 - 7,52" / 191 mm 45,0 cal guns - 214,42lbs / 97,26kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1924 Model
     2 x 3-gun mounts on centreline ends, evenly spread
12 - 5,51" / 140 mm 50,0 cal guns - 88,63lbs / 40,20kg shells, 200 per gun
     Breech loading guns in deck and hoist mounts, 1924 Model
     6 x 2-gun mounts on sides, evenly spread

I know you're using the historical guns so I'll note :
The shell weight on the 191/45 is off. Hawkin's was 90.7kg
The 140/50 should be 37.2kg and likely Quickfire instead of BL

Interesting to compare this to the Royal Niessan I posted.

Question on the Belt/Deck combo :
With a freeboard of 5.35 and the standard decks ~2.44
the crown of the protective deck should be about +0.47m above WL.

With a belt height of 3m, I would guess it
goes from -1.5m below WL to +1.5m above WL,

Giving protection against 'shorts' and also shells arching over the belt
onto the slopes of the protected deck, except from very long range.

But you could have the belt shallower or higher.
What coverage are you expecting for that belt ?

Jefgte · May 24, 2022, 03:48:45 PM

Quote...But you could have the belt shallower or higher.
What coverage are you expecting for that belt ?

All C9 class SS are estimates. I made no choice regarding armament, speed or belt.

Your right about guns & shells weights, but that give a few more shells...

Jefgte · May 28, 2022, 12:13:43 AM

I update C7class from 5500t to 6000t
Economical & powerfull. Speed is maintained to 29kts (increase to 31-32kts is too expensive for 1924 & 6000t)

C9, Byzantine Empire C9 laid down 1924

Displacement:
   6 000 t light; 6 306 t standard; 6 980 t normal; 7 518 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (503,86 ft / 501,97 ft) x 56,76 ft x (16,98 / 17,97 ft)
   (153,58 m / 153,00 m) x 17,30 m x (5,18 / 5,48 m)

Armament:
6 - 7,52" / 191 mm 45,0 cal guns - 200,00lbs / 90,72kg shells, 140 per gun
     Breech loading guns in deck and hoist mounts, 1924 Model
     6 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
8 - 5,51" / 140 mm 50,0 cal guns - 81,99lbs / 37,19kg shells, 180 per gun
     Breech loading guns in deck and hoist mounts, 1924 Model
     8 x Single mounts on sides, evenly spread
4 - 3,00" / 76,2 mm 45,0 cal guns - 11,99lbs / 5,44kg shells, 200 per gun
     Anti-air guns in deck mounts, 1924 Model
     4 x Single mounts on side ends, evenly spread
      4 raised mounts
4 - 1,85" / 47,0 mm 45,0 cal guns - 3,31lbs / 1,50kg shells, 300 per gun
     Quick firing guns in deck mounts, 1924 Model
     4 x Single mounts on side ends, evenly spread
      4 raised mounts
4 - 0,30" / 7,7 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 4 000 per gun
     Machine guns in deck mounts, 1924 Model
     4 x Single mounts on side ends, evenly spread
      4 raised mounts
Weight of broadside 1 917 lbs / 870 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3,94" / 100 mm   341,21 ft / 104,00 m   9,84 ft / 3,00 m
   Ends:   1,38" / 35 mm   160,76 ft / 49,00 m   9,19 ft / 2,80 m
     Main Belt covers 105 % of normal length

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2,76" / 70 mm   0,79" / 20 mm      2,17" / 55 mm
   2nd:   1,57" / 40 mm   0,79" / 20 mm      1,18" / 30 mm
   3rd:   0,39" / 10 mm     -           -
   4th:   0,39" / 10 mm     -           -
   5th:   0,39" / 10 mm     -           -

- Protected deck - single deck:
   For and Aft decks: 1,57" / 40 mm
   Forecastle: 0,98" / 25 mm Quarter deck: 0,98" / 25 mm

- Conning towers: Forward 3,54" / 90 mm, Aft 2,76" / 70 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 50 000 shp / 37 300 Kw = 29,05 kts
   Range 10 000nm at 12,00 kts
   Bunker at max displacement = 1 212 tons

Complement:
   381 - 496

Cost:
   £1,977 million / $7,908 million

Distribution of weights at normal displacement:
   Armament: 561 tons, 8,0 %
     - Guns: 561 tons, 8,0 %
   Armour: 1 317 tons, 18,9 %
     - Belts: 620 tons, 8,9 %
     - Armament: 122 tons, 1,7 %
     - Armour Deck: 525 tons, 7,5 %
     - Conning Towers: 50 tons, 0,7 %
   Machinery: 1 647 tons, 23,6 %
   Hull, fittings & equipment: 2 205 tons, 31,6 %
   Fuel, ammunition & stores: 979 tons, 14,0 %
   Miscellaneous weights: 270 tons, 3,9 %
     - Hull below water: 30 tons
     - Hull above water: 30 tons
     - On freeboard deck: 129 tons
     - Above deck: 81 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6 781 lbs / 3 076 Kg = 31,9 x 7,5 " / 191 mm shells or 1,3 torpedoes
   Stability (Unstable if below 1.00): 1,05
   Metacentric height 2,4 ft / 0,7 m
   Roll period: 15,5 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0,67
   Seaboat quality (Average = 1.00): 1,03

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0,505 / 0,514
   Length to Beam Ratio: 8,84 : 1
   'Natural speed' for length: 22,40 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   Bow angle (Positive = bow angles forward): 5,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   17,00 %, 21,65 ft / 6,60 m, 18,70 ft / 5,70 m
     - Forward deck:   34,00 %, 18,70 ft / 5,70 m, 15,75 ft / 4,80 m
     - Aft deck:   34,00 %, 15,75 ft / 4,80 m, 15,75 ft / 4,80 m
     - Quarter deck:   15,00 %, 15,75 ft / 4,80 m, 15,75 ft / 4,80 m
     - Average freeboard:      16,95 ft / 5,17 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 104,0 %
      - Above water (accommodation/working, high = better): 157,2 %
   Waterplane Area: 19 070 Square feet or 1 772 Square metres
   Displacement factor (Displacement / loading): 103 %
   Structure weight / hull surface area: 87 lbs/sq ft or 426 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,86
      - Longitudinal: 1,22
      - Overall: 0,90
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

25t for Long Range Marconi
56t for top mast rangefinder - FC1918
30t for climatisation
30t for additionnal pumps
32t for 8TTx21" HW
70t for 2x35 minen
22t reserved

TacCovert4 · May 31, 2022, 08:17:22 AM

Yeah, I got my Jaguar class to 32kts at 6000t, but to do that I had to sacrifice 1 gun, some armor, etc.

Jefgte · June 17, 2022, 04:51:27 PM

Update Aquaba class (T500-1921)

Mayyun Class, Byzantine Empire T500 laid down 1924

Displacement:
   500 t light; 521 t standard; 560 t normal; 592 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (261,75 ft / 259,19 ft) x 24,21 ft x (7,81 / 8,10 ft)
   (79,78 m / 79,00 m) x 7,38 m x (2,38 / 2,47 m)

Armament:
2 - 4,00" / 102 mm 45,0 cal guns - 32,27lbs / 14,64kg shells, 220 per gun
     Quick firing guns in deck mounts, 1924 Model
     2 x Single mounts on centreline, aft evenly spread
1 - 1,85" / 47,0 mm 45,0 cal gun - 3,19lbs / 1,45kg shells, 1 000 per gun
     Anti-air gun in deck mount, 1924 Model
     1 x Single mount on centreline, aft deck aft
      1 raised mount
4 - 0,30" / 7,7 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 4 000 per gun
     Machine guns in deck mounts, 1924 Model
     4 x Single mounts on sides, forward evenly spread
Weight of broadside 68 lbs / 31 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm     -           -
   2nd:   0,39" / 10 mm     -           -
   3rd:   0,39" / 10 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 15 338 shp / 11 442 Kw = 30,20 kts
   Range 3 860nm at 10,00 kts
   Bunker at max displacement = 70 tons

Complement:
   56 - 74

Cost:
   £0,189 million / $0,755 million

Distribution of weights at normal displacement:
   Armament: 13 tons, 2,2 %
     - Guns: 13 tons, 2,2 %
   Armour: 7 tons, 1,2 %
     - Armament: 7 tons, 1,2 %
   Machinery: 287 tons, 51,2 %
   Hull, fittings & equipment: 177 tons, 31,7 %
   Fuel, ammunition & stores: 60 tons, 10,7 %
   Miscellaneous weights: 17 tons, 3,0 %
     - On freeboard deck: 16 tons
     - Above deck: 1 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     179 lbs / 81 Kg = 5,6 x 4,0 " / 102 mm shells or 0,2 torpedoes
   Stability (Unstable if below 1.00): 1,12
   Metacentric height 0,7 ft / 0,2 m
   Roll period: 11,8 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0,21
   Seaboat quality (Average = 1.00): 1,00

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0,400 / 0,408
   Length to Beam Ratio: 10,70 : 1
   'Natural speed' for length: 16,10 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 10,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   17,50 %, 14,52 ft / 4,43 m, 12,22 ft / 3,73 m
     - Forward deck:   32,50 %, 12,22 ft / 3,73 m, 10,25 ft / 3,13 m
     - Aft deck:   32,50 %, 10,25 ft / 3,13 m, 10,25 ft / 3,13 m
     - Quarter deck:   17,50 %, 10,25 ft / 3,13 m, 10,91 ft / 3,33 m
     - Average freeboard:      11,14 ft / 3,39 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 172,2 %
      - Above water (accommodation/working, high = better): 128,4 %
   Waterplane Area: 3 863 Square feet or 359 Square metres
   Displacement factor (Displacement / loading): 53 %
   Structure weight / hull surface area: 23 lbs/sq ft or 114 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 2,19
      - Overall: 0,57
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

16 tons for 4TTx533HW

Trial speed : 32.5kts
Bonus : 2.3

Jefgte · June 18, 2022, 09:52:09 AM

For the fun, a 38m - 200t TB from "la Jeune Ecole" in 1924.

T200, Byzantine Empire T200 laid down 1924

Displacement:
   200 t light; 205 t standard; 215 t normal; 222 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (124,67 ft / 124,67 ft) x 14,83 ft x (10,17 / 10,40 ft)
   (38,00 m / 38,00 m) x 4,52 m x (3,10 / 3,17 m)

Armament:
2 - 1,57" / 40,0 mm 45,0 cal guns - 1,97lbs / 0,89kg shells, 250 per gun
     Quick firing guns in deck mounts, 1924 Model
     2 x Single mounts on sides, forward deck forward
1 - 1,57" / 40,0 mm 45,0 cal gun - 1,96lbs / 0,89kg shells, 250 per gun
     Quick firing gun in deck mount, 1924 Model
     1 x Single mount on centreline, aft deck aft
2 - 0,30" / 7,7 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 2 000 per gun
     Machine guns in deck mounts, 1924 Model
     2 x Single mounts on sides, forward deck forward
      2 raised mounts
Weight of broadside 6 lbs / 3 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm     -           -
   2nd:   0,39" / 10 mm     -           -
   3rd:   0,24" / 6 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 8 500 shp / 6 341 Kw = 26,80 kts
   Range 1 500nm at 10,00 kts
   Bunker at max displacement = 17 tons

Complement:
   27 - 36

Cost:
   £0,073 million / $0,291 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0,7 %
     - Guns: 2 tons, 0,7 %
   Armour: 4 tons, 2,0 %
     - Armament: 4 tons, 2,0 %
   Machinery: 115 tons, 53,6 %
   Hull, fittings & equipment: 57 tons, 26,7 %
   Fuel, ammunition & stores: 15 tons, 6,8 %
   Miscellaneous weights: 22 tons, 10,2 %
     - Hull below water: 10 tons
     - On freeboard deck: 12 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     45 lbs / 21 Kg = 23,3 x 1,6 " / 40 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,01
   Metacentric height 0,3 ft / 0,1 m
   Roll period: 11,5 seconds
   Steadiness   - As gun platform (Average = 50 %): 30 %
         - Recoil effect (Restricted arc if above 1.00): 0,07
   Seaboat quality (Average = 1.00): 0,27

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0,400 / 0,405
   Length to Beam Ratio: 8,41 : 1
   'Natural speed' for length: 11,17 kts
   Power going to wave formation at top speed: 80 %
   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:   23,00 %, 8,28 ft / 2,53 m, 9,43 ft / 2,88 m
     - Forward deck:   26,00 %, 7,79 ft / 2,38 m, 7,14 ft / 2,18 m
     - Aft deck:   25,00 %, 7,14 ft / 2,18 m, 6,73 ft / 2,05 m
     - Quarter deck:   26,00 %, 6,73 ft / 2,05 m, 6,27 ft / 1,91 m
     - Average freeboard:      7,43 ft / 2,26 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 180,0 %
      - Above water (accommodation/working, high = better): 57,4 %
   Waterplane Area: 1 138 Square feet or 106 Square metres
   Displacement factor (Displacement / loading): 36 %
   Structure weight / hull surface area: 19 lbs/sq ft or 94 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 6,51
      - Overall: 0,65
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability

12 tons for 4TTx21"

Trial speed: 32,5kts
Bonus: 5,2

Jefgte · June 19, 2022, 09:17:54 AM

For better stability, I increase the lest to 14t & decrease the TT from 4 to 3x21" (3t)

T200, Byzantine Empire T200 laid down 1924

Displacement:
   200 t light; 205 t standard; 215 t normal; 222 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (124,67 ft / 124,67 ft) x 14,83 ft x (10,17 / 10,40 ft)
   (38,00 m / 38,00 m) x 4,52 m x (3,10 / 3,17 m)

Armament:
2 - 1,57" / 40,0 mm 45,0 cal guns - 1,96lbs / 0,89kg shells, 250 per gun
     Quick firing guns in deck mounts, 1924 Model
     2 x Single mounts on sides, forward deck forward
1 - 1,57" / 40,0 mm 45,0 cal gun - 1,96lbs / 0,89kg shells, 250 per gun
     Quick firing gun in deck mount, 1924 Model
     1 x Single mount on centreline, aft deck aft
2 - 0,30" / 7,7 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 2 000 per gun
     Machine guns in deck mounts, 1924 Model
     2 x Single mounts on sides, forward deck forward
      2 raised mounts
Weight of broadside 6 lbs / 3 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm     -           -
   2nd:   0,39" / 10 mm     -           -
   3rd:   0,24" / 6 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 8 500 shp / 6 341 Kw = 26,80 kts
   Range 1 500nm at 10,00 kts
   Bunker at max displacement = 17 tons

Complement:
   27 - 36

Cost:
   £0,073 million / $0,291 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0,7 %
     - Guns: 2 tons, 0,7 %
   Armour: 4 tons, 2,0 %
     - Armament: 4 tons, 2,0 %
   Machinery: 115 tons, 53,5 %
   Hull, fittings & equipment: 57 tons, 26,3 %
   Fuel, ammunition & stores: 15 tons, 6,8 %
   Miscellaneous weights: 23 tons, 10,7 %
     - Hull below water: 14 tons
     - On freeboard deck: 9 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     45 lbs / 20 Kg = 22,9 x 1,6 " / 40 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,05
   Metacentric height 0,3 ft / 0,1 m
   Roll period: 11,1 seconds
   Steadiness   - As gun platform (Average = 50 %): 30 %
         - Recoil effect (Restricted arc if above 1.00): 0,07
   Seaboat quality (Average = 1.00): 0,28

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0,400 / 0,405
   Length to Beam Ratio: 8,41 : 1
   'Natural speed' for length: 11,17 kts
   Power going to wave formation at top speed: 80 %
   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:   23,00 %, 8,28 ft / 2,53 m, 9,43 ft / 2,88 m
     - Forward deck:   26,00 %, 7,79 ft / 2,38 m, 7,14 ft / 2,18 m
     - Aft deck:   25,00 %, 7,14 ft / 2,18 m, 6,73 ft / 2,05 m
     - Quarter deck:   26,00 %, 6,73 ft / 2,05 m, 6,27 ft / 1,91 m
     - Average freeboard:      7,43 ft / 2,26 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 181,7 %
      - Above water (accommodation/working, high = better): 57,4 %
   Waterplane Area: 1 138 Square feet or 106 Square metres
   Displacement factor (Displacement / loading): 36 %
   Structure weight / hull surface area: 19 lbs/sq ft or 92 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 6,42
      - Overall: 0,64
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability

9 tons for 3TTx21"
14 tons lest

Trial speed: 32,5kts
Bonus: 5,2

TacCovert4 · June 19, 2022, 09:25:23 AM

Quote from: Jefgte on June 19, 2022, 09:17:54 AM
For better stability, I increase the lest to 14t & decrease the TT from 4 to 3x21" (3t)

T200, Byzantine Empire T200 laid down 1924

Displacement:
   200 t light; 205 t standard; 215 t normal; 222 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (124,67 ft / 124,67 ft) x 14,83 ft x (10,17 / 10,40 ft)
   (38,00 m / 38,00 m) x 4,52 m x (3,10 / 3,17 m)

Armament:
2 - 1,57" / 40,0 mm 45,0 cal guns - 1,96lbs / 0,89kg shells, 250 per gun
     Quick firing guns in deck mounts, 1924 Model
     2 x Single mounts on sides, forward deck forward
1 - 1,57" / 40,0 mm 45,0 cal gun - 1,96lbs / 0,89kg shells, 250 per gun
     Quick firing gun in deck mount, 1924 Model
     1 x Single mount on centreline, aft deck aft
2 - 0,30" / 7,7 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 2 000 per gun
     Machine guns in deck mounts, 1924 Model
     2 x Single mounts on sides, forward deck forward
      2 raised mounts
Weight of broadside 6 lbs / 3 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm     -           -
   2nd:   0,39" / 10 mm     -           -
   3rd:   0,24" / 6 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 8 500 shp / 6 341 Kw = 26,80 kts
   Range 1 500nm at 10,00 kts
   Bunker at max displacement = 17 tons

Complement:
   27 - 36

Cost:
   £0,073 million / $0,291 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0,7 %
     - Guns: 2 tons, 0,7 %
   Armour: 4 tons, 2,0 %
     - Armament: 4 tons, 2,0 %
   Machinery: 115 tons, 53,5 %
   Hull, fittings & equipment: 57 tons, 26,3 %
   Fuel, ammunition & stores: 15 tons, 6,8 %
   Miscellaneous weights: 23 tons, 10,7 %
     - Hull below water: 14 tons
     - On freeboard deck: 9 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     45 lbs / 20 Kg = 22,9 x 1,6 " / 40 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,05
   Metacentric height 0,3 ft / 0,1 m
   Roll period: 11,1 seconds
   Steadiness   - As gun platform (Average = 50 %): 30 %
         - Recoil effect (Restricted arc if above 1.00): 0,07
   Seaboat quality (Average = 1.00): 0,28

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0,400 / 0,405
   Length to Beam Ratio: 8,41 : 1
   'Natural speed' for length: 11,17 kts
   Power going to wave formation at top speed: 80 %
   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:   23,00 %, 8,28 ft / 2,53 m, 9,43 ft / 2,88 m
     - Forward deck:   26,00 %, 7,79 ft / 2,38 m, 7,14 ft / 2,18 m
     - Aft deck:   25,00 %, 7,14 ft / 2,18 m, 6,73 ft / 2,05 m
     - Quarter deck:   26,00 %, 6,73 ft / 2,05 m, 6,27 ft / 1,91 m
     - Average freeboard:      7,43 ft / 2,26 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 181,7 %
      - Above water (accommodation/working, high = better): 57,4 %
   Waterplane Area: 1 138 Square feet or 106 Square metres
   Displacement factor (Displacement / loading): 36 %
   Structure weight / hull surface area: 19 lbs/sq ft or 92 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 6,42
      - Overall: 0,64
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability

9 tons for 3TTx21"
14 tons lest

Trial speed: 32,5kts
Bonus: 5,2

This is actually a project I'm working on too. Another GTB. Of course figuring out the balance and getting the speed and tonnage together right is tough

Jefgte · June 19, 2022, 04:44:05 PM

Increase range & reduce ballast, add climatisation

T200, Byzantine Empire T200 laid down 1924

Displacement:
   200 t light; 205 t standard; 222 t normal; 235 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (125,16 ft / 125,16 ft) x 15,09 ft x (10,17 / 10,57 ft)
   (38,15 m / 38,15 m) x 4,60 m x (3,10 / 3,22 m)

Armament:
2 - 1,57" / 40,0 mm 45,0 cal guns - 1,96lbs / 0,89kg shells, 250 per gun
     Quick firing guns in deck mounts, 1924 Model
     2 x Single mounts on sides, forward deck forward
1 - 1,57" / 40,0 mm 45,0 cal gun - 1,96lbs / 0,89kg shells, 250 per gun
     Quick firing gun in deck mount, 1924 Model
     1 x Single mount on centreline, aft deck aft
2 - 0,30" / 7,7 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 2 000 per gun
     Machine guns in deck mounts, 1924 Model
     2 x Single mounts on sides, forward deck forward
      2 raised mounts
Weight of broadside 6 lbs / 3 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm     -           -
   2nd:   0,39" / 10 mm     -           -
   3rd:   0,24" / 6 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 9 000 shp / 6 714 Kw = 27,00 kts
   Range 2 750nm at 10,00 kts
900nm at 15kts
360nm at 20kts
130nm at 27kts
70nm at 32kts
   Bunker at max displacement = 30 tons

Complement:
   28 - 37

Cost:
   £0,075 million / $0,300 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0,7 %
     - Guns: 2 tons, 0,7 %
   Armour: 4 tons, 1,9 %
     - Armament: 4 tons, 1,9 %
   Machinery: 120 tons, 54,3 %
   Hull, fittings & equipment: 57 tons, 25,9 %
   Fuel, ammunition & stores: 22 tons, 10,0 %
   Miscellaneous weights: 16 tons, 7,2 %
     - Hull below water: 5 tons
     - Hull above water: 2 tons
     - On freeboard deck: 9 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     46 lbs / 21 Kg = 23,7 x 1,6 " / 40 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,06
   Metacentric height 0,3 ft / 0,1 m
   Roll period: 11,1 seconds
   Steadiness   - As gun platform (Average = 50 %): 28 %
         - Recoil effect (Restricted arc if above 1.00): 0,07
   Seaboat quality (Average = 1.00): 0,24

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0,404 / 0,412
   Length to Beam Ratio: 8,29 : 1
   'Natural speed' for length: 11,19 kts
   Power going to wave formation at top speed: 80 %
   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:   23,00 %, 8,28 ft / 2,53 m, 9,43 ft / 2,88 m
     - Forward deck:   26,00 %, 7,79 ft / 2,38 m, 7,14 ft / 2,18 m
     - Aft deck:   25,00 %, 7,14 ft / 2,18 m, 6,73 ft / 2,05 m
     - Quarter deck:   26,00 %, 6,73 ft / 2,05 m, 6,27 ft / 1,91 m
     - Average freeboard:      7,43 ft / 2,26 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 180,8 %
      - Above water (accommodation/working, high = better): 56,7 %
   Waterplane Area: 1 165 Square feet or 108 Square metres
   Displacement factor (Displacement / loading): 36 %
   Structure weight / hull surface area: 19 lbs/sq ft or 94 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 6,16
      - Overall: 0,64
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability

9 tons for 3TTx21"
2t for climatisation
5 tons ballast

Trial speed: 32,5kts
Bonus: 5,5

Jefgte · June 23, 2022, 07:44:57 AM

Update Mayyun class
Remove 1x102 add 2TT x533
=> LD 1923 - 2x102+1x47+2x3TTx533 HW

Mayyun class, Byzantine Empire T500 laid down 1923

Displacement:
   500 t light; 521 t standard; 560 t normal; 591 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (244,05 ft / 242,78 ft) x 23,79 ft x (8,48 / 8,79 ft)
   (74,38 m / 74,00 m) x 7,25 m x (2,59 / 2,68 m)

Armament:
2 - 4,00" / 102 mm 45,0 cal guns - 32,27lbs / 14,64kg shells, 220 per gun
     Quick firing guns in deck mounts, 1923 Model
     2 x Single mounts on centreline ends, evenly spread
1 - 1,85" / 47,0 mm 45,0 cal gun - 3,19lbs / 1,45kg shells, 1 000 per gun
     Quick firing gun in deck mount, 1923 Model
     1 x Single mount on centreline, forward deck forward
      1 raised mount
4 - 0,30" / 7,7 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 4 000 per gun
     Machine guns in deck mounts, 1923 Model
     4 x Single mounts on side ends, evenly spread
      4 raised mounts
Weight of broadside 68 lbs / 31 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm     -           -
   2nd:   0,39" / 10 mm     -           -
   4th:   0,39" / 10 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 14 300 shp / 10 668 Kw = 29,39 kts
   Range 3 860nm at 10,00 kts
   Bunker at max displacement = 71 tons

Complement:
   56 - 74

Cost:
   £0,175 million / $0,701 million

Distribution of weights at normal displacement:
   Armament: 13 tons, 2,2 %
     - Guns: 13 tons, 2,2 %
   Armour: 7 tons, 1,3 %
     - Armament: 7 tons, 1,3 %
   Machinery: 281 tons, 50,2 %
   Hull, fittings & equipment: 172 tons, 30,7 %
   Fuel, ammunition & stores: 60 tons, 10,8 %
   Miscellaneous weights: 27 tons, 4,8 %
     - On freeboard deck: 26 tons
     - Above deck: 1 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     178 lbs / 81 Kg = 5,6 x 4,0 " / 102 mm shells or 0,2 torpedoes
   Stability (Unstable if below 1.00): 1,09
   Metacentric height 0,7 ft / 0,2 m
   Roll period: 12,1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0,27
   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): 0,400 / 0,408
   Length to Beam Ratio: 10,21 : 1
   'Natural speed' for length: 15,58 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 5,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   18,00 %, 14,44 ft / 4,40 m, 12,47 ft / 3,80 m
     - Forward deck:   33,00 %, 12,47 ft / 3,80 m, 10,27 ft / 3,13 m
     - Aft deck:   33,00 %, 10,27 ft / 3,13 m, 10,27 ft / 3,13 m
     - Quarter deck:   16,00 %, 10,27 ft / 3,13 m, 10,93 ft / 3,33 m
     - Average freeboard:      11,22 ft / 3,42 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 169,3 %
      - Above water (accommodation/working, high = better): 130,8 %
   Waterplane Area: 3 555 Square feet or 330 Square metres
   Displacement factor (Displacement / loading): 55 %
   Structure weight / hull surface area: 24 lbs/sq ft or 115 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 2,71
      - Overall: 0,59
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

1t for top fire control
24t for 2x3TTx533 HW
or 24t for 2x4TTx533
2t engines ventillation

215nm@29kts
580nm@21kts
4810nm@9kts
Trial speed: 31,5kts
Bonus: 2.11

Jefgte · July 04, 2022, 09:49:46 AM

Rework the hull to have a more modern silhouette.
1x76.2+1x47 was 3x47

T200, Byzantine Empire T200 laid down 1924

Displacement:
   200 t light; 206 t standard; 223 t normal; 237 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (129,15 ft / 125,66 ft) x 15,12 ft x (10,17 / 10,57 ft)
   (39,36 m / 38,30 m) x 4,61 m x (3,10 / 3,22 m)

Armament:
1 - 3,00" / 76,2 mm 45,0 cal gun - 13,62lbs / 6,18kg shells, 200 per gun
     Quick firing gun in deck mount, 1924 Model
     1 x Single mount on centreline, forward deck forward
1 - 1,85" / 47,0 mm 50,0 cal gun - 3,35lbs / 1,52kg shells, 300 per gun
     Quick firing gun in deck mount, 1924 Model
     1 x Single mount on centreline, aft deck aft
2 - 0,30" / 7,7 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 2 000 per gun
     Machine guns in deck mounts, 1924 Model
     2 x Single mounts on sides, forward deck forward
      2 raised mounts
Weight of broadside 17 lbs / 8 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm     -           -
   2nd:   0,39" / 10 mm     -           -
   3rd:   0,24" / 6 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 9 000 shp / 6 714 Kw = 27,00 kts
   Range 2 750nm at 10,00 kts
   Bunker at max displacement = 30 tons

Complement:
   28 - 37

Cost:
   £0,077 million / $0,307 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 1,6 %
     - Guns: 4 tons, 1,6 %
   Armour: 3 tons, 1,4 %
     - Armament: 3 tons, 1,4 %
   Machinery: 121 tons, 54,1 %
   Hull, fittings & equipment: 57 tons, 25,7 %
   Fuel, ammunition & stores: 23 tons, 10,5 %
   Miscellaneous weights: 15 tons, 6,7 %
     - Hull below water: 5 tons
     - Hull above water: 1 tons
     - On freeboard deck: 9 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     47 lbs / 21 Kg = 3,5 x 3,0 " / 76 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,07
   Metacentric height 0,3 ft / 0,1 m
   Roll period: 11,0 seconds
   Steadiness   - As gun platform (Average = 50 %): 28 %
         - Recoil effect (Restricted arc if above 1.00): 0,18
   Seaboat quality (Average = 1.00): 0,25

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0,404 / 0,412
   Length to Beam Ratio: 8,31 : 1
   'Natural speed' for length: 11,21 kts
   Power going to wave formation at top speed: 80 %
   Trim (Max stability = 0, Max steadiness = 100): 64
   Bow angle (Positive = bow angles forward): 20,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   23,00 %, 9,60 ft / 2,93 m, 8,04 ft / 2,45 m
     - Forward deck:   26,00 %, 8,04 ft / 2,45 m, 7,22 ft / 2,20 m
     - Aft deck:   25,00 %, 7,22 ft / 2,20 m, 6,73 ft / 2,05 m
     - Quarter deck:   26,00 %, 6,73 ft / 2,05 m, 6,27 ft / 1,91 m
     - Average freeboard:      7,41 ft / 2,26 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 182,0 %
      - Above water (accommodation/working, high = better): 57,9 %
   Waterplane Area: 1 172 Square feet or 109 Square metres
   Displacement factor (Displacement / loading): 36 %
   Structure weight / hull surface area: 20 lbs/sq ft or 95 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 6,19
      - Overall: 0,64
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability

9 tons for 3TTx21"
1t for climatisation
5 tons lest

900nm@15kts
360nm@20kts
130nm@27kts
70nm@32kts

Trial speed: 32,5kts
Bonus: 5,5

TacCovert4 · July 05, 2022, 09:06:14 PM

Seaboat Quality .25....oof that's dangerously low, considering how badly the much larger Roman E class fared in the Caribbean.

The Rock Doctor · July 06, 2022, 07:28:12 AM

We know SS struggles with small fast stuff like this.

There's also the problem of trying to fit a fast hull of a certain displacement into a 40m dock.

There really isn't a lot of room for weight reserves on a ship this size, either.

TacCovert4 · July 06, 2022, 08:41:26 AM

Oh quite. The big problem is that SS is always doing seakeeping for the top speed that you show. Therefore on ships like this that would be running flat out with all hatches dogged and for only short periods of time, the seakeeping indicated isn't necessarily indicative of the actual seakeeping at cruise speed or an economical speed like 8kts where a ship is riding out a storm with steerage-way.

While it's completely 'fudge' by me, I've based my metric on 1 part what SS shows, 1 part what in-game history shows with the Roman E-class DDs after Grand Turk, and 1 part known Sea State info.

Roughly, my metric is thus:

Under .7 Seakeeping: Suitable for Sea States 1-3. Danger of Foundering in Sea State 4, Probability to Founder in Sea State 5 and up. Or by numbers, good in states from a flat calm up to a 4ft (1.25m) swell. Anything above that is going to progressively endanger the ship (SS4 goes from 4-8ft) until you reach storm driven waves or a heavy seaway, and then the ship is basically screwed.

.7-.99 Seakeeping: Suitable for Sea States 1-4. Danger of Foundering in Sea State 5. Probability to Founder in SS6 and up. She can take the occasional 8ft seas without being in trouble, though she's going to be wet if there's any chop. However, as things get serious, like 14ft waves, keeping in mind that also means 14ft Troughs too.....there's a sizable danger of foundering.

1-1.1 Seakeeping: Suitable for Sea States 1-6. Danger of Foundering in SS7. Basically any ship is in danger if the waves are nasty enough.

Those 1.20 Seakeeping ships are being built to be heavily 'stormproof'......and able to steam in the really bad seas without serious worry.....like the South Seas around the bottom of New Zealand and Australia to Antartica, Terra Del Fuego, the North Atlantic in a Storm, The Caribbean or Pacific in a Hurricane, or the Bering Sea when she's firing hard. Sea State 9 is still 'Perfect Storm'......