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Friday, January 12, 2007

A rather nice anachronistic Monmouth class design

One of the better anachronistic designs that I have is of a Monmouth class armoured cruiser that looks like a late 1920's ship. There is a fairly modern bridge structure, two raked funnels, the fore funnel being larger, and two pole masts. The hull is flush decked. The 14-6in guns are in six turrets. There are two triple turrets, one at each end. There are twin 6in turrets in the superfiring position at each end. On each side is a twin 6in turret, for a total of 14. The 3in guns are in twin mounts with shields. The armour belt is 4in and the deck is 2in. This is the Springsharp report:
Monmouth class (anachronistic), Great Britain Armoured Cruiser laid down 1912 (Engine 1908)

Displacement:
 8,457 t light; 8,834 t standard; 10,000 t normal; 10,933 t full load

Dimensions: Length overall / water x beam x draught
 460.84 ft / 460.00 ft x 65.00 ft x 25.00 ft (normal load)
 140.46 m / 140.21 m x 19.81 m  x 7.62 m

Armament:
      10 - 6.00" / 152 mm guns (4 mounts), 108.00lbs / 48.99kg shells, 1912 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      4 - 6.00" / 152 mm guns (2x2 guns), 108.00lbs / 48.99kg shells, 1912 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships
      8 - 3.00" / 76.2 mm guns (4x2 guns), 13.50lbs / 6.12kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on centreline, all aft, all raised mounts - superfiring
 Weight of broadside 1,647 lbs / 747 kg
 Shells per gun, main battery: 180

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 310.00 ft / 94.49 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 104 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 310.00 ft / 94.49 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm
 2nd: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm
 3rd: 2.00" / 51 mm 1.00" / 25 mm  2.00" / 51 mm
 4th: 2.00" / 51 mm 1.00" / 25 mm  2.00" / 51 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 2 shafts, 25,675 ihp / 19,154 Kw = 23.00 kts
 Range 4,500nm at 14.00 kts
 Bunker at max displacement = 2,099 tons (100% coal)

Complement:
 499 - 650

Cost:
 £0.796 million / $3.183 million

Distribution of weights at normal displacement:
 Armament: 206 tons, 2.1 %
 Armour: 2,518 tons, 25.2 %
    - Belts: 844 tons, 8.4 %
    - Torpedo bulkhead: 287 tons, 2.9 %
    - Armament: 631 tons, 6.3 %
    - Armour Deck: 717 tons, 7.2 %
    - Conning Tower: 40 tons, 0.4 %
 Machinery: 2,334 tons, 23.3 %
 Hull, fittings & equipment: 3,399 tons, 34.0 %
 Fuel, ammunition & stores: 1,543 tons, 15.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   11,559 lbs / 5,243 Kg = 107.0 x 6.0 " / 152 mm shells or 2.0 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 3.1 ft / 0.9 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 95 %
   - Recoil effect (Restricted arc if above 1.00): 0.48
 Seaboat quality  (Average = 1.00): 1.64

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.468
 Length to Beam Ratio: 7.08 : 1
 'Natural speed' for length: 21.45 kts
 Power going to wave formation at top speed: 49 %
 Trim (Max stability = 0, Max steadiness = 100): 58
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  24.00 ft / 7.32 m
    - Forecastle (20 %): 19.00 ft / 5.79 m
    - Mid (50 %):  19.00 ft / 5.79 m
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 19.40 ft / 5.91 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 133.6 %
  - Above water (accommodation/working, high = better): 140.5 %
 Waterplane Area: 19,367 Square feet or 1,799 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 108 lbs/sq ft or 525 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.12
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 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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