An anachronistic version of the Royal Oak of 1862

The Royal Oak, launched in 1862, seems like something of a challenge. This was a converted screw line of battleship. I will see if dimensions of 273ft x 58ft x 24ft will work. The armament in 1867 was 4-8in MLR and 20-7in MLR. The battery was 4.5in and the belt, amidships was 4in. The ends were 3in. I will add deck and torpedo bulkhead. In an anachronistic design, the turrets should be 4.5in. I might try the casemates as 4in. We will see what sort of speed is possible. The anachronistic armament will be 4-6.5in/45 and 20-5.5in/50 guns. I would have two twin 6.5in turrets and 2 twin 5.5in turrets in a superfiring position. The remaing 16-5.5in would be in casemates. This is the Springsharp report for the design:

Royal Oak, anachronistic version, Great Britain Armoured Cruiser laid down 1908

Displacement:
 5,311 t light; 5,648 t standard; 6,366 t normal; 6,941 t full load

Dimensions: Length overall / water x beam x draught
 285.10 ft / 282.00 ft x 58.00 ft x 24.00 ft (normal load)
 86.90 m / 85.95 m x 17.68 m  x 7.32 m

Armament:
      4 - 6.50" / 165 mm guns (2x2 guns), 137.31lbs / 62.28kg shells, 1908 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      4 - 5.50" / 140 mm guns (2x2 guns), 83.19lbs / 37.73kg shells, 1908 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, all raised mounts
      16 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1908 Model
   Breech loading guns in casemate mounts 
   on side, evenly spread
   16 guns in hull casemates - Limited use in heavy seas
 Weight of broadside 2,213 lbs / 1,004 kg
 Shells per gun, main battery: 150

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 200.00 ft / 60.96 m 24.00 ft / 7.32 m
 Ends: 2.50" / 64 mm   82.00 ft / 24.99 m 16.00 ft / 4.88 m
   Main Belt covers 109 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 200.00 ft / 60.96 m 24.00 ft / 7.32 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.50" / 114 mm 3.00" / 76 mm  4.50" / 114 mm
 2nd: 4.50" / 114 mm 3.00" / 76 mm  4.50" / 114 mm
 3rd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 1.00" / 25 mm, Conning tower: 4.50" / 114 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 2 shafts, 14,914 ihp / 11,126 Kw = 20.00 kts
 Range 5,000nm at 12.00 kts
 Bunker at max displacement = 1,293 tons (100% coal)

Complement:
 356 - 463

Cost:
 £0.608 million / $2.432 million

Distribution of weights at normal displacement:
 Armament: 277 tons, 4.3 %
 Armour: 1,852 tons, 29.1 %
    - Belts: 963 tons, 15.1 %
    - Torpedo bulkhead: 178 tons, 2.8 %
    - Armament: 463 tons, 7.3 %
    - Armour Deck: 215 tons, 3.4 %
    - Conning Tower: 33 tons, 0.5 %
 Machinery: 1,356 tons, 21.3 %
 Hull, fittings & equipment: 1,826 tons, 28.7 %
 Fuel, ammunition & stores: 1,055 tons, 16.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   6,013 lbs / 2,727 Kg = 43.8 x 6.5 " / 165 mm shells or 1.3 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 2.8 ft / 0.9 m
 Roll period: 14.4 seconds
 Steadiness - As gun platform (Average = 50 %): 67 %
   - Recoil effect (Restricted arc if above 1.00): 0.51
 Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.568
 Length to Beam Ratio: 4.86 : 1
 'Natural speed' for length: 16.79 kts
 Power going to wave formation at top speed: 64 %
 Trim (Max stability = 0, Max steadiness = 100): 61
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  21.00 ft / 6.40 m
    - Forecastle (20 %): 17.00 ft / 5.18 m
    - Mid (50 %):  17.00 ft / 5.18 m
    - Quarterdeck (15 %): 17.00 ft / 5.18 m
    - Stern:  17.00 ft / 5.18 m
    - Average freeboard: 17.32 ft / 5.28 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 157.5 %
  - Above water (accommodation/working, high = better): 105.6 %
 Waterplane Area: 11,605 Square feet or 1,078 Square metres
 Displacement factor (Displacement / loading): 94 %
 Structure weight / hull surface area: 97 lbs/sq ft or 474 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.85
  - Longitudinal: 4.12
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate