Logi's Design Studies

[Jefgte]

I am not sure that pocket BBs are a good solution in Navalism World because, there are much & much BCs able to sink her.

- for small BB, increase armor

- for light cruiser increase the speed to 27-28kts & reduce armor

;)

[Jefgte]

Testing quickly the cruiser

Protected Cruiser, China 10800T  laid down 1915 (Engine 1912)

Displacement:
   10 800 t light; 11 357 t standard; 12 875 t normal; 14 089 t full load

Dimensions: Length overall / water x beam x draught
   554.46 ft / 554.46 ft x 70.21 ft x 22.70 ft (normal load)
   169.00 m / 169.00 m x 21.40 m  x 6.92 m

Armament:
      6 - 10.83" / 275 mm guns (3x2 guns), 634.55lbs / 287.83kg shells, 1915 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, majority aft, 1 raised mount aft - superfiring
      16 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1915 Model
     Breech loading guns in casemate mounts
     on side, evenly spread
      4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1915 Model
     Anti-aircraft 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, 1915 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 4 705 lbs / 2 134 kg
   Shells per gun, main battery: 110

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   360.89 ft / 110.00 m   12.47 ft / 3.80 m
   Ends:   1.57" / 40 mm   144.36 ft / 44.00 m   8.01 ft / 2.44 m
     49.21 ft / 15.00 m Unarmoured ends
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   7.87" / 200 mm   1.97" / 50 mm      4.72" / 120 mm
   2nd:   1.57" / 40 mm         -               -
   3rd:   0.79" / 20 mm         -               -
   4th:   0.50" / 13 mm         -               -

   - Armour deck: 1.97" / 50 mm, Conning tower: 4.72" / 120 mm

Machinery:
   Coal fired boilers, steam turbines,
   Geared drive, 4 shafts, 54 000 shp / 40 284 Kw = 27.12 kts
   Range 8 000nm at 12.00 kts
   Bunker at max displacement = 2 731 tons (100% coal)

Complement:
   603 - 785

Cost:
   £1.751 million / $7.003 million

Distribution of weights at normal displacement:
   Armament: 588 tons, 4.6 %
   Armour: 2 520 tons, 19.6 %
      - Belts: 972 tons, 7.5 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 539 tons, 4.2 %
      - Armour Deck: 953 tons, 7.4 %
      - Conning Tower: 56 tons, 0.4 %
   Machinery: 2 368 tons, 18.4 %
   Hull, fittings & equipment: 5 024 tons, 39.0 %
   Fuel, ammunition & stores: 2 074 tons, 16.1 %
   Miscellaneous weights: 300 tons, 2.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     14 208 lbs / 6 445 Kg = 22.4 x 10.8 " / 275 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 15.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.66
   Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.510
   Length to Beam Ratio: 7.90 : 1
   'Natural speed' for length: 23.55 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   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:      26.25 ft / 8.00 m
      - Forecastle (19 %):   22.64 ft / 6.90 m
      - Mid (50 %):      21.13 ft / 6.44 m (13.12 ft / 4.00 m aft of break)
      - Quarterdeck (18 %):   13.12 ft / 4.00 m
      - Stern:      13.12 ft / 4.00 m
      - Average freeboard:   17.92 ft / 5.46 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 96.9 %
      - Above water (accommodation/working, high = better): 144.1 %
   Waterplane Area: 26 176 Square feet or 2 432 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 129 lbs/sq ft or 629 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.50
      - 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


& the small BB

Pocket BB, China 13200T  laid down 1915 (Engine 1912)

Displacement:
   13 200 t light; 13 838 t standard; 15 537 t normal; 16 897 t full load

Dimensions: Length overall / water x beam x draught
   528.22 ft / 528.22 ft x 75.46 ft x 22.93 ft (normal load)
   161.00 m / 161.00 m x 23.00 m  x 6.99 m

Armament:
      6 - 10.83" / 275 mm guns (2x3 guns), 634.55lbs / 287.83kg shells, 1915 Model
     Breech loading guns in turrets (on barbettes)
     on centreline, evenly spread
      16 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1915 Model
     Breech loading guns in casemate mounts
     on side, evenly spread
      4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1915 Model
     Anti-aircraft 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, 1915 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 4 705 lbs / 2 134 kg
   Shells per gun, main battery: 120

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9.45" / 240 mm   344.49 ft / 105.00 m   12.47 ft / 3.80 m
   Ends:   3.15" / 80 mm   144.36 ft / 44.00 m   8.01 ft / 2.44 m
     39.37 ft / 12.00 m Unarmoured ends
   Upper:   3.15" / 80 mm   344.49 ft / 105.00 m   8.01 ft / 2.44 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead:
      1.57" / 40 mm   344.49 ft / 105.00 m   22.47 ft / 6.85 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   9.45" / 240 mm   3.94" / 100 mm      9.45" / 240 mm
   2nd:   1.57" / 40 mm         -               -
   3rd:   0.79" / 20 mm         -               -
   4th:   0.50" / 13 mm         -               -

   - Armour deck: 2.76" / 70 mm, Conning tower: 9.45" / 240 mm

Machinery:
   Coal fired boilers, steam turbines,
   Geared drive, 4 shafts, 44 000 shp / 32 824 Kw = 24.57 kts
   Range 8 000nm at 12.00 kts
   Bunker at max displacement = 3 059 tons (100% coal)

Complement:
   695 - 904

Cost:
   £1.784 million / $7.134 million

Distribution of weights at normal displacement:
   Armament: 588 tons, 3.8 %
   Armour: 5 071 tons, 32.6 %
      - Belts: 2 267 tons, 14.6 %
      - Torpedo bulkhead: 451 tons, 2.9 %
      - Armament: 747 tons, 4.8 %
      - Armour Deck: 1 479 tons, 9.5 %
      - Conning Tower: 127 tons, 0.8 %
   Machinery: 1 930 tons, 12.4 %
   Hull, fittings & equipment: 5 236 tons, 33.7 %
   Fuel, ammunition & stores: 2 337 tons, 15.0 %
   Miscellaneous weights: 375 tons, 2.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     22 138 lbs / 10 042 Kg = 34.9 x 10.8 " / 275 mm shells or 3.9 torpedoes
   Stability (Unstable if below 1.00): 1.18
   Metacentric height 4.4 ft / 1.4 m
   Roll period: 15.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.43
   Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.595
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 22.98 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   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:      25.26 ft / 7.70 m
      - Forecastle (19 %):   19.36 ft / 5.90 m
      - Mid (50 %):      16.08 ft / 4.90 m
      - Quarterdeck (18 %):   16.08 ft / 4.90 m
      - Stern:      16.08 ft / 4.90 m
      - Average freeboard:   17.66 ft / 5.38 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 98.4 %
      - Above water (accommodation/working, high = better): 134.3 %
   Waterplane Area: 29 016 Square feet or 2 696 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 128 lbs/sq ft or 623 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.44
      - 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

[Logi]

@Rock
Well switching to 1916 engines allow for 1 extra kt of speed without increasing the displacement.

Alternate Design
-more tonnage was allowed for a faster ship
-as a result of faster speeds, steadiness was reduced to 50 for optimal stability
-freeboard was increased to keep seakeeping above 1.00

Xia LouFuor, RRC Light Cruiser laid down 1915 (Engine 1912)

Displacement:
   14,120 t light; 14,739 t standard; 16,484 t normal; 17,880 t full load

Dimensions: Length overall / water x beam x draught
   520.00 ft / 520.00 ft x 70.30 ft x 26.00 ft (normal load)
   158.50 m / 158.50 m x 21.43 m  x 7.92 m

Armament:
      6 - 11.00" / 279 mm guns (2x3 guns), 665.50lbs / 301.87kg shells, 1915 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
      16 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1915 Model
     Quick firing guns in casemate mounts
     on side, all amidships
      18 - 0.93" / 23.6 mm guns in single mounts, 0.40lbs / 0.18kg shells, 1915 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 5,000 lbs / 2,268 kg
   Shells per gun, main battery: 100
   8 - 20.0" / 508 mm submerged torpedo tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   6.00" / 152 mm   301.00 ft / 91.74 m   14.00 ft / 4.27 m
   Ends:   2.00" / 51 mm   219.00 ft / 66.75 m   27.00 ft / 8.23 m
   Upper:   4.00" / 102 mm   301.00 ft / 91.74 m   13.00 ft / 3.96 m
     Main Belt covers 89 % of normal length
     Main belt does not fully cover magazines and engineering spaces

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   7.00" / 178 mm   5.00" / 127 mm      7.00" / 178 mm
   2nd:   3.00" / 76 mm   2.00" / 51 mm      2.00" / 51 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 8.00" / 203 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 4 shafts, 77,472 shp / 57,794 Kw = 28.00 kts
   Range 8,000nm at 12.00 kts
   Bunker at max displacement = 3,141 tons (100% coal)

Complement:
   726 - 945

Cost:
   £2.174 million / $8.698 million

Distribution of weights at normal displacement:
   Armament: 625 tons, 3.8 %
   Armour: 4,190 tons, 25.4 %
      - Belts: 2,245 tons, 13.6 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 838 tons, 5.1 %
      - Armour Deck: 996 tons, 6.0 %
      - Conning Tower: 112 tons, 0.7 %
   Machinery: 3,398 tons, 20.6 %
   Hull, fittings & equipment: 5,606 tons, 34.0 %
   Fuel, ammunition & stores: 2,364 tons, 14.3 %
   Miscellaneous weights: 300 tons, 1.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     15,850 lbs / 7,189 Kg = 23.8 x 11.0 " / 279 mm shells or 1.7 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 15.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.66
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.607
   Length to Beam Ratio: 7.40 : 1
   'Natural speed' for length: 22.80 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      23.00 ft / 7.01 m
      - Forecastle (20 %):   23.00 ft / 7.01 m
      - Mid (50 %):      23.00 ft / 7.01 m
      - Quarterdeck (15 %):   23.00 ft / 7.01 m
      - Stern:      23.00 ft / 7.01 m
      - Average freeboard:   23.00 ft / 7.01 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 106.9 %
      - Above water (accommodation/working, high = better): 162.4 %
   Waterplane Area: 26,912 Square feet or 2,500 Square metres
   Displacement factor (Displacement / loading): 101 %
   Structure weight / hull surface area: 131 lbs/sq ft or 639 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.08
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

[Jefgte]

For better seaboat quality,
- Decrease the BC
- Increase the lenght to 169m

Belt is short


;)

[Logi]

I'll do that later. First, a more presssing matter.

In light of the importance of the  Yangtze river, I wanted to create some more River Monitor to protect those waters. Such is the result. The freeboard is a result of me basing the ship largely on the USS Monitor. I entertained the idea of a breastwork monitor, but I'm not quite sure how that would work out in SS. Well, nevertheless, the mission of this ship is bombarbment of riverline land as well as the sinking of other riverline ships.The 11" guns are most likely overkil though.

Garrison, RRC River Monitor laid down 1916 (Engine 1912)

Displacement:
   2,630 t light; 2,827 t standard; 3,017 t normal; 3,169 t full load

Dimensions: Length overall / water x beam x draught
   200.00 ft / 200.00 ft x 52.00 ft x 12.00 ft (normal load)
   60.96 m / 60.96 m x 15.85 m  x 3.66 m

Armament:
      2 - 11.00" / 279 mm guns (1x2 guns), 665.50lbs / 301.87kg shells, 1916 Model
     Breech loading guns in a turret (on a barbette)
     on centreline amidships
      4 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1916 Model
     Quick firing guns in casemate mounts
     on side, all aft
      4 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1916 Model
     Machine guns in deck mounts
     on side, all forward
   Weight of broadside 1,583 lbs / 718 kg
   Shells per gun, main battery: 150

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   8.00" / 203 mm   130.00 ft / 39.62 m   8.00 ft / 2.44 m
   Ends:   7.00" / 178 mm     70.00 ft / 21.34 m   5.00 ft / 1.52 m
     Main Belt covers 100 % of normal length
     Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
      2.00" / 51 mm   200.00 ft / 60.96 m   12.00 ft / 3.66 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   9.00" / 229 mm   6.00" / 152 mm      8.00" / 203 mm
   2nd:   3.00" / 76 mm   2.00" / 51 mm      2.00" / 51 mm
   3rd:   1.00" / 25 mm         -               -

   - Armour deck: 1.50" / 38 mm, Conning tower: 9.00" / 229 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 1 shaft, 808 shp / 603 Kw = 10.00 kts
   Range 3,000nm at 10.00 kts
   Bunker at max displacement = 342 tons (100% coal)

Complement:
   203 - 264

Cost:
   £0.431 million / $1.723 million

Distribution of weights at normal displacement:
   Armament: 198 tons, 6.6 %
   Armour: 1,182 tons, 39.2 %
      - Belts: 488 tons, 16.2 %
      - Torpedo bulkhead: 178 tons, 5.9 %
      - Armament: 211 tons, 7.0 %
      - Armour Deck: 265 tons, 8.8 %
      - Conning Tower: 40 tons, 1.3 %
   Machinery: 35 tons, 1.2 %
   Hull, fittings & equipment: 965 tons, 32.0 %
   Fuel, ammunition & stores: 387 tons, 12.8 %
   Miscellaneous weights: 250 tons, 8.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,838 lbs / 1,741 Kg = 5.8 x 11.0 " / 279 mm shells or 1.7 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 2.4 ft / 0.7 m
   Roll period: 14.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.26
   Seaboat quality  (Average = 1.00): 0.83

Hull form characteristics:
   Hull has low forecastle, low quarterdeck
   Block coefficient: 0.846
   Length to Beam Ratio: 3.85 : 1
   'Natural speed' for length: 14.14 kts
   Power going to wave formation at top speed: 42 %
   Trim (Max stability = 0, Max steadiness = 100): 73
   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:      3.00 ft / 0.91 m
      - Forecastle (20 %):   3.00 ft / 0.91 m (6.00 ft / 1.83 m aft of break)
      - Mid (50 %):      6.00 ft / 1.83 m
      - Quarterdeck (15 %):   3.00 ft / 0.91 m (6.00 ft / 1.83 m before break)
      - Stern:      3.00 ft / 0.91 m
      - Average freeboard:   4.95 ft / 1.51 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 104.2 %
      - Above water (accommodation/working, high = better): 53.8 %
   Waterplane Area: 9,551 Square feet or 887 Square metres
   Displacement factor (Displacement / loading): 98 %
   Structure weight / hull surface area: 89 lbs/sq ft or 433 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.51
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is cramped
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[The Rock Doctor]

I wonder why you're thinking that way...

The idea's probably sound, but I'd be thinking a pair of smaller gun turrets, and lighter but more extensive belt coverage (width and height).  There are some pretty wild Soviet-era river monitors out there to look at...

[Logi]

I forgot to mention.
The main belts extends from the end of the forecastle to the end of the quarterdeck. The end belt extends from the end of the forecastle and quarterdeck to the ends of the ship. I did this because the midsection of the ship is 3ft higher than the forecastle and quarterdeck.

[The Rock Doctor]

Kinda what I'd be thinking (though not Soviet-style).  Armored against 4" guns - probably not against 6" considering the likely short range of engagement.  Main guns superfiring in order to have height for a full barbette.

Enter ship name, Enter country Enter ship type laid down 1950

Displacement:
   2,318 t light; 2,445 t standard; 2,569 t normal; 2,668 t full load

Dimensions: Length overall / water x beam x draught
   223.10 ft / 223.10 ft x 59.06 ft x 10.50 ft (normal load)
   68.00 m / 68.00 m x 18.00 m  x 3.20 m

Armament:
      4 - 7.99" / 203 mm guns (2x2 guns), 255.24lbs / 115.78kg shells, 1950 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread, all raised mounts
      4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1950 Model
     Breech loading guns in casemate mounts
     on side, all amidships
      2 - 0.31" / 8.0 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1950 Model
     Breech loading guns in deck mounts
     on side, evenly spread
   Weight of broadside 1,075 lbs / 488 kg
   Shells per gun, main battery: 125

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   145.01 ft / 44.20 m   9.84 ft / 3.00 m
   Ends:   0.98" / 25 mm     78.05 ft / 23.79 m   9.84 ft / 3.00 m
   Upper:   0.98" / 25 mm   145.01 ft / 44.20 m   4.92 ft / 1.50 m
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm   1.97" / 50 mm      3.94" / 100 mm
   2nd:   0.98" / 25 mm         -               -
   3rd:   0.39" / 10 mm         -               -

   - Armour deck: 0.98" / 25 mm, Conning tower: 3.94" / 100 mm

Machinery:
   Coal fired boilers, steam turbines,
   Geared drive, 2 shafts, 2,500 shp / 1,865 Kw = 14.04 kts
   Range 4,000nm at 10.00 kts (Bunkerage = 223 tons)

Complement:
   179 - 234

Cost:
   £1.589 million / $6.355 million

Distribution of weights at normal displacement:
   Armament: 134 tons, 5.2 %
   Armour: 668 tons, 26.0 %
      - Belts: 324 tons, 12.6 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 144 tons, 5.6 %
      - Armour Deck: 184 tons, 7.2 %
      - Conning Tower: 16 tons, 0.6 %
   Machinery: 66 tons, 2.6 %
   Hull, fittings & equipment: 1,128 tons, 43.9 %
   Fuel, ammunition & stores: 251 tons, 9.8 %
   Miscellaneous weights: 322 tons, 12.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     4,497 lbs / 2,040 Kg = 17.6 x 8.0 " / 203 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 2.7 ft / 0.8 m
   Roll period: 15.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.32
   Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.650
   Length to Beam Ratio: 3.78 : 1
   'Natural speed' for length: 14.94 kts
   Power going to wave formation at top speed: 52 %
   Trim (Max stability = 0, Max steadiness = 100): 66
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      9.84 ft / 3.00 m
      - Forecastle (20 %):   9.84 ft / 3.00 m
      - Mid (50 %):      9.84 ft / 3.00 m
      - Quarterdeck (15 %):   9.84 ft / 3.00 m
      - Stern:      9.84 ft / 3.00 m
      - Average freeboard:   9.84 ft / 3.00 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 62.4 %
      - Above water (accommodation/working, high = better): 105.7 %
   Waterplane Area: 10,093 Square feet or 938 Square metres
   Displacement factor (Displacement / loading): 117 %
   Structure weight / hull surface area: 93 lbs/sq ft or 456 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.50
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform

[The Rock Doctor]

Or scale up to something stranger...



...which is not intended to represent the sim above, incidently.

[Logi]

Hmm I noticed that your design costs significantly more than mine. Regardless, I shall try to put up another design tomorrow.

[Valles]

Oh, hey, now there's an old friend I hadn't thought about in a while...

[The Rock Doctor]

Logi - you're right, I buggered up the engine year.

[Logi]

A try at the new DD rules.

Enter ship name, Enter country Enter ship type laid down 1916

Displacement:
   750 t light; 774 t standard; 847 t normal; 906 t full load

Dimensions: Length overall / water x beam x draught
   342.00 ft / 330.00 ft x 30.00 ft x 7.00 ft (normal load)
   104.24 m / 100.58 m x 9.14 m  x 2.13 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1916 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
   Weight of broadside 128 lbs / 58 kg
   Shells per gun, main battery: 100

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.50" / 13 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 22,719 shp / 16,948 Kw = 32.00 kts
   Range 3,100nm at 12.00 kts
   Bunker at max displacement = 131 tons

Complement:
   78 - 102

Cost:
   £0.165 million / $0.661 million

Distribution of weights at normal displacement:
   Armament: 16 tons, 1.9 %
   Armour: 4 tons, 0.5 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 4 tons, 0.5 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 438 tons, 51.6 %
   Hull, fittings & equipment: 242 tons, 28.6 %
   Fuel, ammunition & stores: 97 tons, 11.5 %
   Miscellaneous weights: 50 tons, 5.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     229 lbs / 104 Kg = 7.1 x 4.0 " / 102 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.40
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 10.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.12
   Seaboat quality  (Average = 1.00): 0.74

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.428
   Length to Beam Ratio: 11.00 : 1
   'Natural speed' for length: 18.17 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   Bow angle (Positive = bow angles forward): 38.67 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (20 %):   12.00 ft / 3.66 m
      - Mid (50 %):      10.00 ft / 3.05 m
      - Quarterdeck (15 %):   10.00 ft / 3.05 m
      - Stern:      10.00 ft / 3.05 m
      - Average freeboard:   10.94 ft / 3.33 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 187.0 %
      - Above water (accommodation/working, high = better): 158.6 %
   Waterplane Area: 6,208 Square feet or 577 Square metres
   Displacement factor (Displacement / loading): 45 %
   Structure weight / hull surface area: 24 lbs/sq ft or 119 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.47
      - Longitudinal: 0.80
      - Overall: 0.50
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

A total of 35 kts with Maddox's 'fomula'

A total of 34.4768 kts with Guiness's formula

[The Rock Doctor]

A good start, but it's the cross-sectional hull strength that needs to be at or above 0.50...

[Logi]

Fixed

Heng Kua, RRC Destroyer laid down 1916

Displacement:
   749 t light; 773 t standard; 832 t normal; 879 t full load

Dimensions: Length overall / water x beam x draught
   342.00 ft / 330.00 ft x 30.00 ft x 7.00 ft (normal load)
   104.24 m / 100.58 m x 9.14 m  x 2.13 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1916 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
   Weight of broadside 128 lbs / 58 kg
   Shells per gun, main battery: 100

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.30" / 8 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 22,321 shp / 16,652 Kw = 32.00 kts
   Range 2,500nm at 12.00 kts
   Bunker at max displacement = 106 tons

Complement:
   76 - 100

Cost:
   £0.163 million / $0.652 million

Distribution of weights at normal displacement:
   Armament: 16 tons, 1.9 %
   Armour: 3 tons, 0.3 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 3 tons, 0.3 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 428 tons, 51.5 %
   Hull, fittings & equipment: 252 tons, 30.3 %
   Fuel, ammunition & stores: 83 tons, 9.9 %
   Miscellaneous weights: 50 tons, 6.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     234 lbs / 106 Kg = 7.3 x 4.0 " / 102 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.36
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 10.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.12
   Seaboat quality  (Average = 1.00): 0.74

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.420
   Length to Beam Ratio: 11.00 : 1
   'Natural speed' for length: 18.17 kts
   Power going to wave formation at top speed: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   Bow angle (Positive = bow angles forward): 38.67 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (20 %):   12.00 ft / 3.66 m
      - Mid (50 %):      10.00 ft / 3.05 m
      - Quarterdeck (15 %):   10.00 ft / 3.05 m
      - Stern:      10.00 ft / 3.05 m
      - Average freeboard:   10.94 ft / 3.33 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 186.9 %
      - Above water (accommodation/working, high = better): 161.8 %
   Waterplane Area: 6,172 Square feet or 573 Square metres
   Displacement factor (Displacement / loading): 45 %
   Structure weight / hull surface area: 25 lbs/sq ft or 124 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.85
      - Overall: 0.52
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather