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Saturday, July 09, 2005

A variant of the Ger/CB/1915 design ("Blücher")

I have an early sketch of the Ger/CB/1905 light battlecruiser design that has a better secondary battery than the other versions. The ship has the same 4-12in/45 BLR but has 10-4in QF guns in casemates and then 4-4in QF guns in shields mounted on the superstructure, giving 14-4in QF guns. The ship otherwise is consistent with the rather sparse specification. The original cost was estimated at £1,710,000. This is the Springsharp report:
Ger/CB/1905, Germany Battlecruiser laid down 1905 (Engine 1909)

Displacement:
 16,767 t light; 17,325 t standard; 19,000 t normal; 20,340 t full load

Dimensions: Length overall / water x beam x draught
 700.00 ft / 700.00 ft x 80.00 ft x 24.40 ft (normal load)
 213.36 m / 213.36 m x 24.38 m  x 7.44 m

Armament:
     4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
     10 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
   Quick firing guns in casemate mounts
   on side, evenly spread
     4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
   Breech loading guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 3,904 lbs / 1,771 kg
 Shells per gun, main battery: 80

Armour:
  - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 550.00 ft / 167.64 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 121 % of normal length
   Main belt does not fully cover magazines and engineering spaces

  - Torpedo Bulkhead:
  1.50" / 38 mm 550.00 ft / 167.64 m 24.00 ft / 7.32 m

  - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm
 3rd: 2.00" / 51 mm       -         -

  - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines,
 Direct drive, 4 shafts, 104,749 shp / 78,142 Kw = 31.00 kts
 Range 5,000nm at 15.00 kts
 Bunker at max displacement = 3,014 tons

Complement:
 808 - 1,051

Cost:
 £1.663 million / $6.653 million

Distribution of weights at normal displacement:
 Armament: 488 tons, 2.6 %
 Armour: 4,141 tons, 21.8 %
    - Belts: 1,524 tons, 8.0 %
    - Torpedo bulkhead: 733 tons, 3.9 %
    - Armament: 429 tons, 2.3 %
    - Armour Deck: 1,364 tons, 7.2 %
    - Conning Tower: 92 tons, 0.5 %
 Machinery: 4,761 tons, 25.1 %
 Hull, fittings & equipment: 7,376 tons, 38.8 %
 Fuel, ammunition & stores: 2,233 tons, 11.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   24,353 lbs / 11,046 Kg = 28.2 x 12.0 " / 305 mm shells or 3.2 torpedoes
 Stability (Unstable if below 1.00): 1.36
 Metacentric height 6.2 ft / 1.9 m
 Roll period: 13.5 seconds
 Steadiness - As gun platform (Average = 50 %): 68 %
   - Recoil effect (Restricted arc if above 1.00): 0.32
 Seaboat quality  (Average = 1.00): 1.36

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.487
 Length to Beam Ratio: 8.75 : 1
 'Natural speed' for length: 26.46 kts
 Power going to wave formation at top speed: 52 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  28.00 ft / 8.53 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (61 %):  25.00 ft / 7.62 m (17.00 ft / 5.18 m aft of break)
    - Quarterdeck (15 %): 17.00 ft / 5.18 m
    - Stern:  17.00 ft / 5.18 m
    - Average freeboard: 22.12 ft / 6.74 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 134.1 %
  - Above water (accommodation/working, high = better): 191.6 %
 Waterplane Area: 36,866 Square feet or 3,425 Square metres
 Displacement factor (Displacement / loading): 108 %
 Structure weight / hull surface area: 133 lbs/sq ft or 650 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.30
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

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