Minelayer Cruiser

[ledeper]

Hero Class, Baltic federation Minecruiser laid down 1910

Displacement:
   7.824 t light; 8.061 t standard; 8.061 t normal; 8.061 t full load

Dimensions: Length overall / water x beam x draught
   501,01 ft / 492,13 ft x 46,59 ft x 20,41 ft (normal load)
   152,71 m / 150,00 m x 14,20 m  x 6,22 m

Armament:
      8 - 5,91" / 150 mm guns (4x2 guns), 102,98lbs / 46,71kg shells, 1910 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      3 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1910 Model
     Breech loading guns in deck mounts
     on side, all amidships
   Weight of broadside 886 lbs / 402 kg
   Shells per gun, main battery: 150
   4 - 23,6" / 600 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   5,00" / 127 mm   319,88 ft / 97,50 m   8,19 ft / 2,50 m
   Ends:   Unarmoured
   Upper:   0,50" / 13 mm   319,88 ft / 97,50 m   8,00 ft / 2,44 m
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3,00" / 76 mm   1,50" / 38 mm      2,00" / 51 mm

   - Armour deck: 2,50" / 64 mm, Conning tower: 5,00" / 127 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 3 shafts, 38.564 shp / 28.769 Kw = 26,50 kts
   Range 0nm at 0,00 kts
   Bunker at max displacement = 0 tons (100% coal)

Complement:
   424 - 552

Cost:
   £0,612 million / $2,449 million

Distribution of weights at normal displacement:
   Armament: 111 tons, 1,4 %
   Armour: 1.560 tons, 19,3 %
      - Belts: 598 tons, 7,4 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 141 tons, 1,7 %
      - Armour Deck: 778 tons, 9,6 %
      - Conning Tower: 43 tons, 0,5 %
   Machinery: 1.753 tons, 21,7 %
   Hull, fittings & equipment: 3.401 tons, 42,2 %
   Fuel, ammunition & stores: 237 tons, 2,9 %
   Miscellaneous weights: 1.000 tons, 12,4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     8.130 lbs / 3.688 Kg = 78,9 x 5,9 " / 150 mm shells or 1,3 torpedoes
   Stability (Unstable if below 1.00): 1,00
   Metacentric height 1,6 ft / 0,5 m
   Roll period: 15,5 seconds
   Steadiness   - As gun platform (Average = 50 %): 49 %
         - Recoil effect (Restricted arc if above 1.00): 0,48
   Seaboat quality  (Average = 1.00): 1,10

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,603
   Length to Beam Ratio: 10,56 : 1
   'Natural speed' for length: 22,18 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 44
   Bow angle (Positive = bow angles forward): 20,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      24,41 ft / 7,44 m
      - Forecastle (20 %):   15,52 ft / 4,73 m
      - Mid (50 %):      15,52 ft / 4,73 m
      - Quarterdeck (15 %):   15,52 ft / 4,73 m
      - Stern:      15,52 ft / 4,73 m
      - Average freeboard:   16,23 ft / 4,95 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 95,1 %
      - Above water (accommodation/working, high = better): 99,4 %
   Waterplane Area: 16.816 Square feet or 1.562 Square metres
   Displacement factor (Displacement / loading): 116 %
   Structure weight / hull surface area: 118 lbs/sq ft or 577 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1,43
      - Longitudinal: 1,92
      - Overall: 1,47
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate
               Space for 40 mines.
              Named after Naval Heroes: Horn,Wachtmeister,Trolle,Juel,Adeler,Tordenskjold.

[Borys]

Ahoj!
We don't do turrets with 6 inchers. Replace with mount&hoist. That should improve stability, which doesn't look that good.  But the design needs some work - you have excessive hull strength. Even if you wish to build in the reinforcments necessary to carry 600 mines, 1,47 is still excessive.

Borys

[Korpen]

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 3 shafts, 38.564 shp / 28.769 Kw = 26,50 kts
   Range 0nm at 0,00 kts
   Bunker at max displacement = 0 tons (100% coal)

it seems you have forgotten to add the range and crusing speed.

[ledeper]

4 mines pr Ton?

[Borys]

Ahoj!
IIRC it is 1,5 tonne per mine. But I may be wrong on this. Will check.

ADDED LATER:
I WAS wrong :)
One mine weights 1 long tonne - 1016kg
Borys