I had started to treat this as an American ship, but the secondary armament clearly marks it as British. The armament is 9-21in and 20-5.25in DP guns. I added a light AA armament, and reduced the draft. In 1999, I was willing to have these very deep drafts, but not now. The specification from 1999 simply said:
Displacement=120,000 tons Cp=0.57 9-21in/45
Length=1180ft Cm=0.92 20-5.25in DP
Beam=147ft
Draft=46ft-2in
Speed=35 knots
V/sqrt(L)=35/34.351128=1.0188894
This is the Springsharp report for the modified design (less draft):
GB/CB/1942 Large, Great Britain Battlecruiser laid down 1942
Displacement:
108,407 t light; 112,992 t standard; 120,000 t normal; 125,606 t full load
Dimensions: Length overall / water x beam x draught
1,184.59 ft / 1,180.00 ft x 147.00 ft x 38.00 ft (normal load)
361.06 m / 359.66 m x 44.81 m x 11.58 m
Armament:
9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on side ends, majority forward, 1 raised mount - superfiring
20 - 5.25" / 133 mm guns (12 mounts), 72.35lbs / 32.82kg shells, 1942 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 8 raised mounts - superfiring
84 - 1.57" / 40.0 mm guns (21x4 guns), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side ends, majority aft
56 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 43,299 lbs / 19,640 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.0" / 406 mm 780.00 ft / 237.74 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 102 % of normal length
- Torpedo Bulkhead:
4.00" / 102 mm 780.00 ft / 237.74 m 37.00 ft / 11.28 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 18.0" / 457 mm 11.0" / 279 mm 16.0" / 406 mm
2nd: 5.00" / 127 mm 5.00" / 127 mm 5.00" / 127 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -
- Armour deck: 7.00" / 178 mm, Conning tower: 18.00" / 457 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 6 shafts, 473,837 shp / 353,482 Kw = 35.00 kts
Range 8,500nm at 18.00 kts
Bunker at max displacement = 12,614 tons
Caution: Too much power for number of propellor shafts
Complement:
3,222 - 4,190
Cost:
£64.105 million / $256.420 million
Distribution of weights at normal displacement:
Armament: 5,412 tons, 4.5 %
Armour: 38,720 tons, 32.3 %
- Belts: 9,047 tons, 7.5 %
- Torpedo bulkhead: 4,271 tons, 3.6 %
- Armament: 7,451 tons, 6.2 %
- Armour Deck: 17,006 tons, 14.2 %
- Conning Tower: 943 tons, 0.8 %
Machinery: 12,378 tons, 10.3 %
Hull, fittings & equipment: 51,897 tons, 43.2 %
Fuel, ammunition & stores: 11,593 tons, 9.7 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
182,469 lbs / 82,767 Kg = 39.4 x 21.0 " / 533 mm shells or 33.8 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 13.3 ft / 4.1 m
Roll period: 16.9 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.03
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.637
Length to Beam Ratio: 8.03 : 1
'Natural speed' for length: 34.35 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 37.00 ft / 11.28 m
- Forecastle (20 %): 27.00 ft / 8.23 m
- Mid (50 %): 27.00 ft / 8.23 m
- Quarterdeck (15 %): 27.00 ft / 8.23 m
- Stern: 27.00 ft / 8.23 m
- Average freeboard: 27.80 ft / 8.47 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 78.4 %
- Above water (accommodation/working, high = better): 209.6 %
Waterplane Area: 131,324 Square feet or 12,200 Square metres
Displacement factor (Displacement / loading): 112 %
Structure weight / hull surface area: 303 lbs/sq ft or 1,479 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.17
- Longitudinal: 0.95
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
I experimented with the original draft, and the design changes a good bit. Except for the draft being unworkable (minor detail), the ship is much better:
GB/CB/1942 Large, Great Britain Battlecruiser laid down 1942
Displacement:
103,862 t light; 108,447 t standard; 120,000 t normal; 129,242 t full load
Dimensions: Length overall / water x beam x draught
1,184.59 ft / 1,180.00 ft x 147.00 ft x 46.17 ft (normal load)
361.06 m / 359.66 m x 44.81 m x 14.07 m
Armament:
9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on side ends, majority forward, 1 raised mount - superfiring
20 - 5.25" / 133 mm guns (12 mounts), 72.35lbs / 32.82kg shells, 1942 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 8 raised mounts - superfiring
84 - 1.57" / 40.0 mm guns (21x4 guns), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side ends, majority aft
56 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 43,299 lbs / 19,640 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 17.0" / 432 mm 780.00 ft / 237.74 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 102 % of normal length
- Torpedo Bulkhead:
4.00" / 102 mm 780.00 ft / 237.74 m 37.00 ft / 11.28 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 17.0" / 432 mm 11.0" / 279 mm 16.0" / 406 mm
2nd: 5.00" / 127 mm 5.00" / 127 mm 5.00" / 127 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -
- Armour deck: 9.00" / 229 mm, Conning tower: 18.00" / 457 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 6 shafts, 447,890 shp / 334,126 Kw = 35.00 kts
Range 15,000nm at 18.00 kts
Bunker at max displacement = 20,795 tons
Complement:
3,222 - 4,190
Cost:
£62.489 million / $249.955 million
Distribution of weights at normal displacement:
Armament: 5,412 tons, 4.5 %
Armour: 41,860 tons, 34.9 %
- Belts: 9,556 tons, 8.0 %
- Torpedo bulkhead: 4,271 tons, 3.6 %
- Armament: 7,408 tons, 6.2 %
- Armour Deck: 19,681 tons, 16.4 %
- Conning Tower: 943 tons, 0.8 %
Machinery: 11,700 tons, 9.8 %
Hull, fittings & equipment: 44,890 tons, 37.4 %
Fuel, ammunition & stores: 16,138 tons, 13.4 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
174,208 lbs / 79,019 Kg = 37.6 x 21.0 " / 533 mm shells or 31.9 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 12.2 ft / 3.7 m
Roll period: 17.7 seconds
Steadiness - As gun platform (Average = 50 %): 61 %
- Recoil effect (Restricted arc if above 1.00): 0.47
Seaboat quality (Average = 1.00): 1.21
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.524
Length to Beam Ratio: 8.03 : 1
'Natural speed' for length: 34.35 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 37.00 ft / 11.28 m
- Forecastle (20 %): 27.00 ft / 8.23 m
- Mid (50 %): 27.00 ft / 8.23 m
- Quarterdeck (15 %): 27.00 ft / 8.23 m
- Stern: 27.00 ft / 8.23 m
- Average freeboard: 27.80 ft / 8.47 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 76.3 %
- Above water (accommodation/working, high = better): 188.7 %
Waterplane Area: 118,204 Square feet or 10,982 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 274 lbs/sq ft or 1,336 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.04
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily
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