The Ger/CL/1921 Fleet Cruiser

I believe that I have previously misunderstood this design concept and had tried to reach the 37 knots originally desired, rather than to stay close to displacement and weights. The ship was intended for very lightweight machinery of 45 SHP/ton. The power planned was only for 56,200 SHP normal and overload of 67,400 SHP. The weight are useful, for comparison with the Springsharp design:

Original Weights:

Hull      3,210 tons
Machinery 1,250 tons
Aux. Mach.  229 tons
Armament    156 tons
Protection  675 tons
Misc.       480 tons

This is another ship for which I have a photograph:

This is the Springsharp design:

Ger/CL/1921 Fleet Cruiser, Germany Light Cruiser laid down 1921 (Engine 1945)

Displacement:
 6,202 t light; 6,411 t standard; 7,200 t normal; 7,831 t full load

Dimensions: Length overall / water x beam x draught
 577.54 ft / 575.00 ft x 52.00 ft x 18.00 ft (normal load)
 176.03 m / 175.26 m x 15.85 m  x 5.49 m

Armament:
      6 - 6.00" / 152 mm guns (3x2 guns), 108.00lbs / 48.99kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, majority aft, 1 raised mount aft - superfiring
 Weight of broadside 648 lbs / 294 kg
 Shells per gun, main battery: 180
 8 - 23.6" / 600.0001 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 2.25" / 57 mm 430.00 ft / 131.06 m 9.00 ft / 2.74 m
 Ends: Unarmoured
   Main Belt covers 115 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 0.94" / 24 mm 0.94" / 24 mm  0.94" / 24 mm

   - Armour deck: 0.75" / 19 mm, Conning tower: 2.00" / 51 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 86,553 shp / 64,569 Kw = 34.00 kts
 Range 5,600nm at 18.00 kts
 Bunker at max displacement = 1,420 tons

Complement:
 390 - 508

Cost:
 £1.505 million / $6.019 million

Distribution of weights at normal displacement:
 Armament: 81 tons, 1.1 %
 Armour: 697 tons, 9.7 %
    - Belts: 352 tons, 4.9 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 60 tons, 0.8 %
    - Armour Deck: 269 tons, 3.7 %
    - Conning Tower: 16 tons, 0.2 %
 Machinery: 2,186 tons, 30.4 %
 Hull, fittings & equipment: 3,239 tons, 45.0 %
 Fuel, ammunition & stores: 998 tons, 13.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   9,004 lbs / 4,084 Kg = 83.4 x 6.0 " / 152 mm shells or 1.2 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 2.6 ft / 0.8 m
 Roll period: 13.7 seconds
 Steadiness - As gun platform (Average = 50 %): 80 %
   - Recoil effect (Restricted arc if above 1.00): 0.38
 Seaboat quality  (Average = 1.00): 1.59

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.468
 Length to Beam Ratio: 11.06 : 1
 'Natural speed' for length: 23.98 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  29.00 ft / 8.84 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (42 %):  27.00 ft / 8.23 m (19.00 ft / 5.79 m aft of break)
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 22.52 ft / 6.86 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 107.6 %
  - Above water (accommodation/working, high = better): 157.4 %
 Waterplane Area: 19,367 Square feet or 1,799 Square metres
 Displacement factor (Displacement / loading): 126 %
 Structure weight / hull surface area: 86 lbs/sq ft or 419 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.90
  - Longitudinal: 2.46
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 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