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Saturday, July 02, 2005

A fast German armoured cruiser: Ger/CA/1916

The Ger/CA/1916 is practically a battlecruiser. It is 725ft x 80ft x 22.7ft and the displacement ballooned to 23,850 tons from the planned 20,000 tons. The armament is 6-12in/50 BLR and 12-6in QF guns. The armour basis is 6 inches. The speed is a relatively fast 33 knots. The pencil drawing is of a flush-decked ship with two funnels, cased about 2/3's of the way up and with a tripod foremast. I tried to realy the sloped appearance of the hull, but Springsharp thinks it has a raised forecastle, when that is not the case. The look is more German than many of my so-called German ships. This is the Springsharp report:
Ger/CA/1916 12in guns, Germany Armoured Cruiser laid down 1916 (Engine 1927)

Displacement:
 21,543 t light; 22,317 t standard; 23,850 t normal; 25,076 t full load

Dimensions: Length overall / water x beam x draught
 726.08 ft / 725.00 ft x 80.00 ft x 22.70 ft (normal load)
 221.31 m / 220.98 m x 24.38 m  x 6.92 m

Armament:
      6 - 12.00" / 305 mm guns (2x3 guns), 864.00lbs / 391.90kg shells, 1916 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      12 - 6.00" / 152 mm guns (6x2 guns), 108.00lbs / 48.99kg shells, 1916 Model
   Quick firing guns in turrets (on barbettes)
   on side, all forward, 2 raised mounts - superfiring
 Weight of broadside 6,480 lbs / 2,939 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 500.00 ft / 152.40 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 106 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 500.00 ft / 152.40 m 20.00 ft / 6.10 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 7.00" / 178 mm 5.00" / 127 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 163,220 shp / 121,762 Kw = 33.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,759 tons

Complement:
 959 - 1,247

Cost:
 £3.527 million / $14.110 million

Distribution of weights at normal displacement:
 Armament: 810 tons, 3.4 %
 Armour: 5,904 tons, 24.8 %
    - Belts: 2,008 tons, 8.4 %
    - Torpedo bulkhead: 370 tons, 1.6 %
    - Armament: 989 tons, 4.1 %
    - Armour Deck: 2,430 tons, 10.2 %
    - Conning Tower: 107 tons, 0.4 %
 Machinery: 5,152 tons, 21.6 %
 Hull, fittings & equipment: 9,677 tons, 40.6 %
 Fuel, ammunition & stores: 2,307 tons, 9.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   30,228 lbs / 13,711 Kg = 35.0 x 12.0 " / 305 mm shells or 3.4 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 4.9 ft / 1.5 m
 Roll period: 15.2 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.63
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has raised forecastle, rise forward of midbreak
 Block coefficient: 0.634
 Length to Beam Ratio: 9.06 : 1
 'Natural speed' for length: 26.93 kts
 Power going to wave formation at top speed: 57 %
 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:  31.00 ft / 9.45 m
    - Forecastle (20 %): 28.00 ft / 8.53 m (17.00 ft / 5.18 m aft of break)
    - Mid (50 %):  26.00 ft / 7.92 m (25.00 ft / 7.62 m aft of break)
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 24.79 ft / 7.56 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 127.4 %
  - Above water (accommodation/working, high = better): 203.4 %
 Waterplane Area: 43,783 Square feet or 4,068 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 150 lbs/sq ft or 733 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.26
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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