The Middle Kingdoms new trio

[P3D]

I'd be perfectly fine with the 0.16 or whatever low seakeeping. MK ships have to be built for mainly the Yellow Sea and the East China Sea to some extent. Now a destroyer won't have the range to get further South of Shanghai. The weather is fine in the sheltered Yellow Sea save about one typhoon a year in average. The ships would steam at 10kts most of the time, the 30kts speed is necessary only for torpedo attack and to get away. And the only thing why SS2 thinks bad seakeeping is that the ship is only 70m long.

Notes:
- I'd have a raised forecastle (helps accomodation and seakeeping), you don't even need to lenghten it to the midbreak as the gun is aft. However, I'd try to get a second gun, then have raise fore of the midbreak - which can be at even 30% length for that matter.
- 2 torpedoes for a ship built for torpedo attack (by the lack of guns) seems way to few. Then, I'd increase misc weight to 8t to have enough reserve for larger future torpedoes.
- what would have to give is the 30kts speed (I won't force it with 1909 engines) and then range

[maddox]

28 kts is the best I can do on the restrictions.

1909 Coal burners with turbines
Good seakeeping 1.0+)
Steadiness 0.7+
Range 1500 miles @12 kts

.

I got 2600nm @12 kts- mostely because the effect on light load weight = 9 days of patroling.
2 75mm guns and 2 25machine guns on it, with 6 20" torpedo's.
And all the rest follows the guidelines.
Stability is on the low side, but I doubt when these ships resive any telling battle damage , that capsizing would be a worry. Drowing in its whole would. Also, that's a straigth trade off against steadyness.
With trim set on 44, stability goes to 1.10, steadiness to the still good 0.54 ,and seakeeping isn't affected.

My own imposed restiction is the 70m length- the MK has a lot of size 0 slips and docks, lets use them.
With a longer hull it would have been a bit more easy.

Chi "Alpha", Royal Middle Kingdom Small Torpedo Boat Destroyer laid down 1913 (Engine 1909)

Displacement:
   501 t light; 516 t standard; 610 t normal; 685 t full load

Dimensions: Length overall / water x beam x draught
   229,66 ft / 229,66 ft x 19,69 ft x 10,17 ft (normal load)
   70,00 m / 70,00 m x 6,00 m  x 3,10 m

Armament:
      2 - 2,95" / 75,0 mm guns in single mounts, 12,87lbs / 5,84kg shells, 1913 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      2 - 0,98" / 25,0 mm guns in single mounts, 0,48lbs / 0,22kg shells, 1913 Model
     Machine guns in deck mounts
     on centreline ends, evenly spread, all raised mounts
   Weight of broadside 27 lbs / 12 kg
   Shells per gun, main battery: 150
   6 - 20,0" / 508 mm above water torpedoes

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 12.961 shp / 9.669 Kw = 28,00 kts
   Range 2.600nm at 12,00 kts
   Bunker at max displacement = 169 tons (100% coal)

Complement:
   60 - 79

Cost:
   £0,072 million / $0,288 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 0,5%
   Machinery: 326 tons, 53,6%
   Hull, fittings & equipment: 163 tons, 26,8%
   Fuel, ammunition & stores: 108 tons, 17,8%
   Miscellaneous weights: 8 tons, 1,3%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     137 lbs / 62 Kg = 10,7 x 3,0 " / 75 mm shells or 0,2 torpedoes
   Stability (Unstable if below 1.00): 1,01
   Metacentric height 0,4 ft / 0,1 m
   Roll period: 12,4 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0,15
   Seaboat quality  (Average = 1.00): 1,24

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0,464
   Length to Beam Ratio: 11,67 : 1
   'Natural speed' for length: 15,15 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   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:      16,40 ft / 5,00 m
      - Forecastle (23%):   16,40 ft / 5,00 m (9,84 ft / 3,00 m aft of break)
      - 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:   11,35 ft / 3,46 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 178,6%
      - Above water (accommodation/working, high = better): 15,5%
   Waterplane Area: 2.918 Square feet or 271 Square metres
   Displacement factor (Displacement / loading): 46%
   Structure weight / hull surface area: 20 lbs/sq ft or 99 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 3,84
      - Overall: 0,61
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[P3D]

I don't think you need 1.24 seakeeping  - I'd actually be fine with 0.16.

[maddox]

It's just a result to get a good steady hull. And increasing the speed with even half a knot would ruin all the other abilities.