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Wednesday, July 12, 2006

The Ger/BB/1915-1916 design

All I have on the Red Book page for this is an inboard profile. I used a little creative license to supply the other specifications. I did that and what would make Springsharp happy. The pencil drawing shows a 920ft long, flush-decked hull. The armament is four main turrets, with two superfiring. The secondary armament is clearly meant to be 16-6in QF guns. This is the Springsharp report:
Ger/BB/1915-1916, Enter country Enter ship type laid down 1916 (Engine 1927)

Displacement:
 72,261 t light; 75,702 t standard; 79,500 t normal; 82,539 t full load

Dimensions: Length overall / water x beam x draught
 925.50 ft / 920.00 ft x 125.00 ft x 33.00 ft (normal load)
 282.09 m / 280.42 m x 38.10 m  x 10.06 m

Armament:
      12 - 18.00" / 457 mm guns (4x3 guns), 2,916.00lbs / 1,322.68kg shells, 1916 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      16 - 6.00" / 152 mm guns (8x2 guns), 108.00lbs / 48.99kg shells, 1916 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 36,720 lbs / 16,656 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 17.0" / 432 mm 500.00 ft / 152.40 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 84 % of normal length

   - Torpedo Bulkhead:
  6.00" / 152 mm 500.00 ft / 152.40 m 33.00 ft / 10.06 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 17.0" / 432 mm 10.0" / 254 mm  17.0" / 432 mm
 2nd: 6.00" / 152 mm 6.00" / 152 mm  6.00" / 152 mm

   - Armour deck: 6.00" / 152 mm, Conning tower: 17.00" / 432 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 200,864 shp / 149,844 Kw = 29.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 6,837 tons

Complement:
 2,366 - 3,077

Cost:
 £11.900 million / $47.601 million

Distribution of weights at normal displacement:
 Armament: 4,590 tons, 5.8 %
 Armour: 29,824 tons, 37.5 %
    - Belts: 6,502 tons, 8.2 %
    - Torpedo bulkhead: 3,663 tons, 4.6 %
    - Armament: 8,446 tons, 10.6 %
    - Armour Deck: 10,536 tons, 13.3 %
    - Conning Tower: 677 tons, 0.9 %
 Machinery: 6,340 tons, 8.0 %
 Hull, fittings & equipment: 31,507 tons, 39.6 %
 Fuel, ammunition & stores: 7,239 tons, 9.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   114,544 lbs / 51,956 Kg = 39.3 x 18.0 " / 457 mm shells or 20.5 torpedoes
 Stability (Unstable if below 1.00): 1.08
 Metacentric height 8.1 ft / 2.5 m
 Roll period: 18.4 seconds
 Steadiness - As gun platform (Average = 50 %): 60 %
   - Recoil effect (Restricted arc if above 1.00): 0.84
 Seaboat quality  (Average = 1.00): 1.19

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.733
 Length to Beam Ratio: 7.36 : 1
 'Natural speed' for length: 30.33 kts
 Power going to wave formation at top speed: 49 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  40.00 ft / 12.19 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (50 %):  27.00 ft / 8.23 m
    - Quarterdeck (15 %): 27.00 ft / 8.23 m
    - Stern:  27.00 ft / 8.23 m
    - Average freeboard: 28.04 ft / 8.55 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 82.6 %
  - Above water (accommodation/working, high = better): 206.3 %
 Waterplane Area: 94,918 Square feet or 8,818 Square metres
 Displacement factor (Displacement / loading): 100 %
 Structure weight / hull surface area: 250 lbs/sq ft or 1,220 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.99
  - Longitudinal: 1.10
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

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