Swiss Torpedo Cruiser

[Desertfox]

The Swiss Torpedo Cruiser. A heavy armament foward provides supressing fire in the torpedo run, the lighter armament on the sides is for swatting screeening destroyers. The torpedoes are placed in 3 triple mounts.


NSS Snowy Owl, New Switzerland Torpedo Cruiser laid down 1910 (Engine 1912)

Displacement:
   2,701 t light; 2,852 t standard; 3,372 t normal; 3,787 t full load

Dimensions: Length overall / water x beam x draught
   390.00 ft / 390.00 ft x 37.00 ft x 17.40 ft (normal load)
   118.87 m / 118.87 m x 11.28 m  x 5.30 m

Armament:
      4 - 6.00" / 152 mm guns (2x2 guns), 108.00lbs / 48.99kg shells, 1910 Model
     Breech loading guns in deck mounts with hoists
     on centreline, all forward, 1 raised mount - superfiring
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1910 Model
     Breech loading guns in deck mounts
     on side, all amidships
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1910 Model
     Quick firing guns in deck mounts
     on centreline, all aft, 1 raised mount
      4 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1910 Model
     Breech loading guns in deck mounts
     on side, evenly spread
   Weight of broadside 632 lbs / 287 kg
   Shells per gun, main battery: 220
   9 - 19.7" / 500.38 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm   1.00" / 25 mm      1.00" / 25 mm

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 25,337 shp / 18,901 Kw = 27.00 kts
   Range 5,100nm at 15.00 kts
   Bunker at max displacement = 935 tons

Complement:
   220 - 287

Cost:
   £0.302 million / $1.209 million

Distribution of weights at normal displacement:
   Armament: 79 tons, 2.3 %
   Armour: 374 tons, 11.1 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 18 tons, 0.5 %
      - Armour Deck: 346 tons, 10.3 %
      - Conning Tower: 10 tons, 0.3 %
   Machinery: 1,010 tons, 30.0 %
   Hull, fittings & equipment: 1,208 tons, 35.8 %
   Fuel, ammunition & stores: 670 tons, 19.9 %
   Miscellaneous weights: 30 tons, 0.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,711 lbs / 1,230 Kg = 25.1 x 6.0 " / 152 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 12.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.69
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.470
   Length to Beam Ratio: 10.54 : 1
   'Natural speed' for length: 19.75 kts
   Power going to wave formation at top speed: 56 %
   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:      20.00 ft / 6.10 m
      - Forecastle (19 %):   14.00 ft / 4.27 m
      - Mid (40 %):      14.00 ft / 4.27 m
      - Quarterdeck (15 %):   12.00 ft / 3.66 m
      - Stern:      12.00 ft / 3.66 m
      - Average freeboard:   13.71 ft / 4.18 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 117.3 %
      - Above water (accommodation/working, high = better): 67.1 %
   Waterplane Area: 9,361 Square feet or 870 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 68 lbs/sq ft or 334 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 2.02
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[olekit]

Why are you willing to spend your money for that stuff - big slow ships with the lack of torpedo tubes... this one could not wound the cruiser o battleship because the lack of the speed and moreover this ship may be found and attacked before it comes to the distance of torpedo shot.....

[The Rock Doctor]

Why this and not a quartet of torpedo-boats?

[Carthaginian]

Desertfox wants more range than the DD or TB will provide in order to make long-distance strikes possible, since he has so much territory to cover.

[swamphen]

Do you have the tech for that armament layout?

[P3D]

He has.

[swamphen]

OK; the only problem I see then is that the l:b ratio is over 10:1...

[Desertfox]

Which is deliberate, wanted a long thin boat. I might push her up to 29kts.

As for why not TBs, I already have plenty of those. I need a leader for them.

[Carthaginian]

I don't know if cruisers can go over 10:1; I think that only destroyers can, and they are limited to 12:1.