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Wednesday, July 11, 2007

The Ger/BB/1907 design

The Ger/BB/1907 design actually came out lighter in Springsharp 3.0b2 than originally designed. The power to reach 24 knots is almost exactly right in my 1971 design, at 54,000 SHP, when Springsharp asks for 52,180 SHP. That is lower due to the displacement being less for the specified armament, armour, and speed. The idea was to have a 24 knot ship with 8-12in/50 BLR and 12-4in QF guns. The belt was 8in/13in, while the decks were 3in+1in. This is the Springsharp report:
Ger/BB/1907, Germany Battleship laid down 1907

Displacement:
 21,982 t light; 23,022 t standard; 25,921 t normal; 28,240 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (622.00 ft / 620.00 ft) x 105.00 ft x (26.00 / 27.81 ft)
 (189.59 m / 188.98 m) x 32.00 m  x (7.92 / 8.48 m)

Armament:
      8 - 12.00" / 305 mm 50.0 cal guns - 915.00lbs / 415.04kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts, 1907 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      12 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1907 Model
   12 x Single mounts on sides amidships
      Weight of broadside 7,727 lbs / 3,505 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.0" / 330 mm 330.00 ft / 100.58 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 330.00 ft / 100.58 m 8.00 ft / 2.44 m
   Main Belt covers 82 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 330.00 ft / 100.58 m 26.00 ft / 7.92 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.0" / 330 mm 8.00" / 203 mm  10.0" / 254 mm
 2nd: 3.00" / 76 mm 2.00" / 51 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 4.00" / 102 mm For and Aft decks

   - Conning towers: Forward 10.00" / 254 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 52,180 shp / 38,926 Kw = 24.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 5,218 tons

Complement:
 1,020 - 1,327

Cost:
 £1.987 million / $7.948 million

Distribution of weights at normal displacement:
 Armament: 1,570 tons, 6.1 %
 Armour: 7,920 tons, 30.6 %
    - Belts: 2,565 tons, 9.9 %
    - Torpedo bulkhead: 635 tons, 2.4 %
    - Armament: 1,931 tons, 7.4 %
    - Armour Deck: 2,601 tons, 10.0 %
    - Conning Tower: 189 tons, 0.7 %
 Machinery: 2,965 tons, 11.4 %
 Hull, fittings & equipment: 9,527 tons, 36.8 %
 Fuel, ammunition & stores: 3,939 tons, 15.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   47,597 lbs / 21,589 Kg = 55.1 x 12.0 " / 305 mm shells or 8.2 torpedoes
 Stability (Unstable if below 1.00): 1.32
 Metacentric height 8.8 ft / 2.7 m
 Roll period: 14.8 seconds
 Steadiness - As gun platform (Average = 50 %): 78 %
   - Recoil effect (Restricted arc if above 1.00): 0.34
 Seaboat quality  (Average = 1.00): 1.56

Hull form characteristics:
 Hull has rise forward of midbreak,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.536 / 0.546
 Length to Beam Ratio: 5.90 : 1
 'Natural speed' for length: 24.90 kts
 Power going to wave formation at top speed: 48 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  29.00 ft / 8.84 m,  26.00 ft / 7.92 m
    - Forward deck: 33.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Aft deck: 27.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Quarter deck: 15.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  22.94 ft / 6.99 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 81.4 %
  - Above water (accommodation/working, high = better): 187.6 %
 Waterplane Area: 44,841 Square feet or 4,166 Square metres
 Displacement factor (Displacement / loading): 121 %
 Structure weight / hull surface area: 168 lbs/sq ft or 818 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.67
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

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