My latest attempt at the Ger/CDV/1915 design

The Ger/CDV/1915 design really works well in Springsharp, when I pay attention to the weights that I wanted in 1971 (or so). I am guessing that the guns were 6-15in, but the weights match so well that I am sure that it is correct. This design was trying to be the 1915 analog to the 1880's and 1890's coast defense battleships (or third class battleships). This is the specification from 1971:

Ger/CDV/1915  Cost = £ 1,540,000
Displacement:  17,100 tons
Full Load Displacement: 19,600 tons

450ft x 90ft x 15ft

Cp=0.61  Cm=0.97

Hull weight=0.30 x 450ft x 90ft x 37ft (hull depth)
25,000 SHP, at 27 SHP/ton

Weights:
Hull:      6,000 tons
Armament:  1,332 tons
Misc:      1,370 tons
Prot:      7,473 tons
Mach:        925 tons
Fuel:      1,500 tons
Feedwater: 1,000 tons

This is the Springsharp report:

Ger/CDV/1915, Germany Coast Defense Battleship laid down 1915 (Engine 1927)

Displacement:
16,952 t light; 17,788 t standard; 18,600 t normal; 19,249 t full load

Dimensions: Length overall / water x beam x draught
459.00 ft / 459.00 ft x 90.00 ft x 25.00 ft (normal load)
139.90 m / 139.90 m x 27.43 m  x 7.62 m

Armament:
    6 - 15.00" / 381 mm guns (2x3 guns), 1,687.50lbs / 765.44kg shells, 1915 Model
  Breech loading guns in turrets (on barbettes)
  on centreline ends, evenly spread
    8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1915 Model
  Quick firing guns in deck mounts with hoists
  on side, all amidships, 4 raised mounts - superfiring
Weight of broadside 10,989 lbs / 4,985 kg
Shells per gun, main battery: 75

Armour:
 - Belts:  Width (max) Length (avg)  Height (avg)
Main: 13.0" / 330 mm 250.00 ft / 76.20 m 16.00 ft / 4.88 m
Ends: Unarmoured
  Main Belt covers 84 % of normal length
  Main belt does not fully cover magazines and engineering spaces

 - Torpedo Bulkhead:
 2.00" / 51 mm 250.00 ft / 76.20 m 24.00 ft / 7.32 m

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

 - Armour deck: 5.00" / 127 mm, Conning tower: 12.00" / 305 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 29,419 shp / 21,946 Kw = 21.00 kts
Range 3,750nm at 15.00 kts
Bunker at max displacement = 1,461 tons

Complement:
796 - 1,035

Cost:
£2.730 million / $10.922 million

Distribution of weights at normal displacement:
Armament: 1,374 tons, 7.4 %
Armour: 7,473 tons, 40.2 %
   - Belts: 2,466 tons, 13.3 %
   - Torpedo bulkhead: 444 tons, 2.4 %
   - Armament: 1,506 tons, 8.1 %
   - Armour Deck: 2,875 tons, 15.5 %
   - Conning Tower: 181 tons, 1.0 %
Machinery: 929 tons, 5.0 %
Hull, fittings & equipment: 7,177 tons, 38.6 %
Fuel, ammunition & stores: 1,648 tons, 8.9 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
  24,443 lbs / 11,087 Kg = 14.5 x 15.0 " / 381 mm shells or 4.7 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 5.6 ft / 1.7 m
Roll period: 15.9 seconds
Steadiness - As gun platform (Average = 50 %): 54 %
  - Recoil effect (Restricted arc if above 1.00): 0.49
Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.630
Length to Beam Ratio: 5.10 : 1
'Natural speed' for length: 21.42 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
   - Stem:  22.00 ft / 6.71 m
   - Forecastle (20 %): 20.00 ft / 6.10 m
   - Mid (48 %):  20.00 ft / 6.10 m (12.00 ft / 3.66 m aft of break)
   - Quarterdeck (15 %): 12.00 ft / 3.66 m
   - Stern:  12.00 ft / 3.66 m
   - Average freeboard: 16.00 ft / 4.88 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 91.3 %
 - Above water (accommodation/working, high = better): 114.9 %
Waterplane Area: 31,079 Square feet or 2,887 Square metres
Displacement factor (Displacement / loading): 92 %
Structure weight / hull surface area: 176 lbs/sq ft or 860 Kg/sq metre
Hull strength (Relative):
 - Cross-sectional: 0.92
 - Longitudinal: 2.03
 - Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate