Amazon Ad

Friday, November 25, 2005

A 1916 fast British battleship

Jumping back to my series of British fast battleships, I designed a 16in-gunned version for 1916. This is attempting to fit into that series, and uses a secondary armament of 5.5in QF guns with a main battery of 16in BLR. The armour basis is 13in. The result is almost a battlecruiser or a fast battleship reminiscent of the late 1930's. The layout is conservative, with four twin turrets for the 16in guns. The 5.5in guns would be in shields and mounted high (upper deck and superstructure). As usual, I have retained a 16ft high belt of the maximum thickness, unlike the usual practice of having a thick lower belt and a thinner upper belt. There is no "upper deck side" armour, either. The deck is 4in thick, and hopefully that would suffice. The torpedo bulkhead is 3in thick, which is substantial for the period. The speed is 27.5 knots with a 6,200nm range at a cruising speed of 17 knots. This is the Springsharp report:
GB/BB/1916, Great Britain Battleship laid down 1916

Displacement:
 35,019 t light; 36,614 t standard; 39,800 t normal; 42,349 t full load

Dimensions: Length overall / water x beam x draught
 710.00 ft / 710.00 ft x 95.00 ft x 32.00 ft (normal load)
 216.41 m / 216.41 m x 28.96 m  x 9.75 m

Armament:
      8 - 16.00" / 406 mm guns (4x2 guns), 2,048.00lbs / 928.96kg shells, 1916 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      14 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1916 Model
   Quick firing guns in deck mounts with hoists
   on side, evenly spread, 4 raised mounts
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1916 Model
   Anti-aircraft guns in deck mounts 
   on side ends, evenly spread
      16 - 1.57" / 40.0 mm guns (1x16 guns), 2.00lbs / 0.91kg shells, 1916 Model
   Quick firing guns in deck mount 
   on side
 Weight of broadside 17,709 lbs / 8,032 kg
 Shells per gun, main battery: 80
 4 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.0" / 330 mm 470.00 ft / 143.26 m 16.00 ft / 4.88 m
 Ends: 5.00" / 127 mm 240.00 ft / 73.15 m 16.00 ft / 4.88 m
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 470.00 ft / 143.26 m 30.00 ft / 9.14 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.0" / 330 mm 9.00" / 229 mm  13.0" / 330 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 13.00" / 330 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 110,883 shp / 82,719 Kw = 27.50 kts
 Range 6,200nm at 17.00 kts
 Bunker at max displacement = 5,735 tons

Complement:
 1,408 - 1,831

Cost:
 £5.995 million / $23.978 million

Distribution of weights at normal displacement:
 Armament: 2,213 tons, 5.6 %
 Armour: 14,164 tons, 35.6 %
    - Belts: 4,911 tons, 12.3 %
    - Torpedo bulkhead: 1,565 tons, 3.9 %
    - Armament: 3,553 tons, 8.9 %
    - Armour Deck: 3,807 tons, 9.6 %
    - Conning Tower: 326 tons, 0.8 %
 Machinery: 4,131 tons, 10.4 %
 Hull, fittings & equipment: 14,511 tons, 36.5 %
 Fuel, ammunition & stores: 4,781 tons, 12.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   47,417 lbs / 21,508 Kg = 23.2 x 16.0 " / 406 mm shells or 7.1 torpedoes
 Stability (Unstable if below 1.00): 1.04
 Metacentric height 5.0 ft / 1.5 m
 Roll period: 17.9 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.92
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.645
 Length to Beam Ratio: 7.47 : 1
 'Natural speed' for length: 26.65 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:  29.00 ft / 8.84 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (67 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 21.76 ft / 6.63 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 97.8 %
  - Above water (accommodation/working, high = better): 151.6 %
 Waterplane Area: 51,452 Square feet or 4,780 Square metres
 Displacement factor (Displacement / loading): 99 %
 Structure weight / hull surface area: 198 lbs/sq ft or 965 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.25
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

No comments:

Amazon Context Links