Swiss Battleline Escort

[Desertfox]

Another new ship for 1908. This ship will replace the rebuilt ex-ACM T-40 class destroyers I currently use for escorting my battleline. It sacrifices speed for armament. 10 are to be built. Torpedoes are place two twins per side.

NSS Mountbatten, New Switzerland Destroyer laid down 1907 (Engine 1909)

Displacement:
   539 t light; 568 t standard; 706 t normal; 815 t full load

Dimensions: Length overall / water x beam x draught
   270.00 ft / 270.00 ft x 27.00 ft x 7.70 ft (normal load)
   82.30 m / 82.30 m x 8.23 m  x 2.35 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1907 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1907 Model
     Quick firing guns in deck mounts
     on centreline, all amidships
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1907 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 136 lbs / 62 kg
   Shells per gun, main battery: 200
   8 - 19.7" / 500.38 mm above water torpedoes

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, 8,140 shp / 6,073 Kw = 25.00 kts
   Range 5,000nm at 12.00 kts
   Bunker at max displacement = 247 tons

Complement:
   67 - 88

Cost:
   £0.075 million / $0.301 million

Distribution of weights at normal displacement:
   Armament: 17 tons, 2.4 %
   Armour: 4 tons, 0.6 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 4 tons, 0.6 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 302 tons, 42.7 %
   Hull, fittings & equipment: 201 tons, 28.4 %
   Fuel, ammunition & stores: 167 tons, 23.7 %
   Miscellaneous weights: 15 tons, 2.1 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     293 lbs / 133 Kg = 9.1 x 4.0 " / 102 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.48
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 9.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.25
   Seaboat quality  (Average = 1.00): 1.51

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.440
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 16.43 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   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:      15.00 ft / 4.57 m
      - Forecastle (25 %):   12.00 ft / 3.66 m
      - Mid (50 %):      11.00 ft / 3.35 m
      - Quarterdeck (15 %):   11.00 ft / 3.35 m
      - Stern:      11.00 ft / 3.35 m
      - Average freeboard:   11.68 ft / 3.56 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 159.6 %
      - Above water (accommodation/working, high = better): 49.2 %
   Waterplane Area: 4,613 Square feet or 429 Square metres
   Displacement factor (Displacement / loading): 79 %
   Structure weight / hull surface area: 23 lbs/sq ft or 112 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.71
      - Overall: 0.56
   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
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

Having four sets of tubes on the beams is going to take up a lot of deck space on that narrow beam.  Why not put two twin tubes on the centreline and put the 40mm on the beam?

[Borys]

You all know what I am to write ....
Look at a twice as large RL ship:
http://www.dreadnoughtproject.org/plans/SM_V170-177_1918//langsschnitt_obere_ansicht_100dpi.jpg

4x105
2x2x500, 2x1x500

Borys

[Desertfox]

I know she is crowded but it shouldnt be too much of a problem. The Van Hakes are 20ft shorter and have 3ft less beam. They mount 3x4", 8x40mm, and 4x19.7" TT.

I wanted two triples but that's not allowed. Three twins wont fit on the centerline, and two twins just isnt enough torpedoes. What I'll probably do is go back to the 18" torpedoes instead of the 19.7".

Borys, the V170s are not only 10 kts faster, but they also mount 4x6" guns.

[Borys]

Ahoj!
The 15cm guns were quickly abandsonded, as they were a silly idea.
Borys

[P3D]

Breakfast for protected cruisers, would slow down the battleline in bad weather. Otherwise, not much objections. Note the 'Extremely poor' accomodation, that won't
help the morale on long voyages either.

[Desertfox]

I rethought the whole concept and some points needed to be fixed. Primarly it needed more light guns and the torpedo tubes needed to be on the centerline (to be able to fire all in one salvo). As to bad weather, she is a better seaboat than my regular destroyers. She carries 2 torpedo reloads.

Comparision of her to the Van Hakes (top) and "Black Cats" (Middle):


NSS Mountbatten, New Switzerland Destroyer laid down 1907 (Engine 1909)

Displacement:
   480 t light; 507 t standard; 622 t normal; 714 t full load

Dimensions: Length overall / water x beam x draught
   257.00 ft / 257.00 ft x 25.00 ft x 7.70 ft (normal load)
   78.33 m / 78.33 m x 7.62 m  x 2.35 m

Armament:
      3 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1907 Model
     Breech loading guns in deck mounts
     on centreline ends, majority forward, 1 raised mount
      8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1907 Model
     Quick firing guns in deck mounts
     on side, evenly spread
      2 - 1.57" / 40.0 mm guns (1x2 guns), 1.95lbs / 0.89kg shells, 1907 Model
     Quick firing guns in deck mount
     on centreline aft, all raised guns - superfiring
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1907 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 116 lbs / 53 kg
   Shells per gun, main battery: 210
   6 - 18.0" / 457.2 mm above water torpedoes

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, 7,662 shp / 5,716 Kw = 25.00 kts
   Range 4,500nm at 12.00 kts
   Bunker at max displacement = 206 tons

Complement:
   61 - 80

Cost:
   £0.067 million / $0.267 million

Distribution of weights at normal displacement:
   Armament: 14 tons, 2.3 %
   Armour: 3 tons, 0.5 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 3 tons, 0.5 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 270 tons, 43.4 %
   Hull, fittings & equipment: 175 tons, 28.2 %
   Fuel, ammunition & stores: 142 tons, 22.9 %
   Miscellaneous weights: 17 tons, 2.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     248 lbs / 113 Kg = 7.8 x 4.0 " / 102 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.51
   Metacentric height 1.3 ft / 0.4 m
   Roll period: 9.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.25
   Seaboat quality  (Average = 1.00): 1.52

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.440
   Length to Beam Ratio: 10.28 : 1
   'Natural speed' for length: 16.03 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   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:      15.00 ft / 4.57 m
      - Forecastle (30 %):   11.00 ft / 3.35 m
      - Mid (50 %):      11.00 ft / 3.35 m
      - Quarterdeck (15 %):   10.00 ft / 3.05 m
      - Stern:      10.00 ft / 3.05 m
      - Average freeboard:   11.16 ft / 3.40 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 161.9 %
      - Above water (accommodation/working, high = better): 71.5 %
   Waterplane Area: 4,066 Square feet or 378 Square metres
   Displacement factor (Displacement / loading): 75 %
   Structure weight / hull surface area: 22 lbs/sq ft or 107 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.84
      - Overall: 0.57
   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
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather