Looking at the ocst of rebuilding the Kypris and Makedonia to replacing them with new 22,000 ton ships figuring that 1930's armour is better than 1909 armour and new ships are a better long term investment.
The choice is 7 or 8 12" guns. The difference is 0.5 knots and 2" of belt. Which would you go for given that this should replace the 2 BC and perhaps more to replace the 2 8" ships.
7 gun upper 8 gun lower
Design 7x12", Greek Battlecruiser laid down 1937
Displacement:
22,041 t light; 23,184 t standard; 24,834 t normal; 26,155 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(735.01 ft / 721.00 ft) x 90.00 ft x (23.50 / 24.46 ft)
(224.03 m / 219.76 m) x 27.43 m x (7.16 / 7.46 m)
Armament:
7 - 12.00" / 305 mm 49.7 cal guns - 913.35lbs / 414.29kg shells, 150 per gun
Breech loading guns in turret on barbette mounts , 1937 Model
1 x 3-gun mount on centreline, aft deck forward
2 x 2-gun mounts on centreline, forward deck forward
12 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 150 per gun
Breech loading guns in deck and hoist mounts , 1937 Model
6 x 2-gun mounts on sides, evenly spread
6 raised mounts
12 - 1.57" / 40.0 mm 60.0 cal guns - 2.14lbs / 0.97kg shells, 2,000 per gun
Anti-air guns in deck mounts , 1937 Model
6 x Quad mounts on centreline, evenly spread
34 - 0.79" / 20.0 mm 60.0 cal guns - 0.27lbs / 0.12kg shells, 5,000 per gun
Anti-air guns in deck mounts , 1937 Model
34 x Single mounts on centreline, evenly spread
Weight of broadside 7,140 lbs / 7,140 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 11.8" / 300 mm 403.76 ft / 123.07 m 11.38 ft / 3.47 m
Ends: Unarmoured
Main Belt covers 86 % of normal length
- Torpedo Bulkhead:
0.50" / 13 mm 403.76 ft / 123.07 m 21.37 ft / 6.51 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 279 mm 7.00" / 178 mm 12.0" / 305 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm -
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -
- Armour deck: 5.00" / 127 mm, Conning tower: 9.00" / 229 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 105,140 shp / 78,434 Kw = 30.50 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 2,971 tons
Complement:
988 - 1,285
Cost:
£10.361 million / $41.443 million
Distribution of weights at normal displacement:
Armament: 1,716 tons, 6.9 %
Armour: 8,526 tons, 34.3 %
- Belts: 2,380 tons, 9.6 %
- Torpedo bulkhead: 160 tons, 0.6 %
- Armament: 1,376 tons, 5.5 %
- Armour Deck: 4,446 tons, 17.9 %
- Conning Tower: 165 tons, 0.7 %
Machinery: 2,914 tons, 11.7 %
Hull, fittings & equipment: 9,644 tons, 38.8 %
Fuel, ammunition & stores: 2,793 tons, 11.2 %
Miscellaneous weights: 100 tons, 0.4 %
- Hull below water: 100 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
42,546 lbs / 19,298 Kg = 49.2 x 12.0 " / 305 mm shells or 5.8 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 5.2 ft / 1.6 m
Roll period: 16.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.47
Seaboat quality (Average = 1.00): 1.00
Hull form characteristics:
Hull has rise aft of midbreak, low quarterdeck ,
a normal bow and small transom stern
Block coefficient (normal/deep): 0.570 / 0.577
Length to Beam Ratio: 8.01 : 1
'Natural speed' for length: 30.95 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 22.00 degrees
Stern overhang: 3.30 ft / 1.01 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 22.00 %, 26.50 ft / 8.08 m, 16.00 ft / 4.88 m
- Forward deck: 16.00 %, 16.00 ft / 4.88 m, 16.00 ft / 4.88 m
- Aft deck: 40.00 %, 23.00 ft / 7.01 m, 23.00 ft / 7.01 m
- Quarter deck: 22.00 %, 15.00 ft / 4.57 m, 15.00 ft / 4.57 m
- Average freeboard: 19.50 ft / 5.94 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 85.2 %
- Above water (accommodation/working, high = better): 194.6 %
Waterplane Area: 48,061 Square feet or 4,465 Square metres
Displacement factor (Displacement / loading): 117 %
Structure weight / hull surface area: 152 lbs/sq ft or 743 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.04
- 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
Design 8x12", Greek Battlecruiser laid down 1937
Displacement:
21,965 t light; 23,184 t standard; 24,834 t normal; 26,155 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(735.01 ft / 721.00 ft) x 90.00 ft x (23.50 / 24.46 ft)
(224.03 m / 219.76 m) x 27.43 m x (7.16 / 7.46 m)
Armament:
8 - 12.00" / 305 mm 49.7 cal guns - 913.35lbs / 414.29kg shells, 150 per gun
Breech loading guns in turret on barbette mounts , 1937 Model
2 x 3-gun mounts on centreline, aft deck forward
1 x 2-gun mount on centreline, forward deck forward
12 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 150 per gun
Breech loading guns in deck and hoist mounts , 1937 Model
6 x 2-gun mounts on sides, evenly spread
6 raised mounts
12 - 1.57" / 40.0 mm 60.0 cal guns - 2.14lbs / 0.97kg shells, 2,000 per gun
Anti-air guns in deck mounts , 1937 Model
6 x Twin mounts on centreline, evenly spread
34 - 0.79" / 20.0 mm 60.0 cal guns - 0.27lbs / 0.12kg shells, 5,000 per gun
Anti-air guns in deck mounts , 1937 Model
34 x Single mounts on centreline, evenly spread
Weight of broadside 8,054 lbs / 8,054 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 9.50" / 241 mm 407.00 ft / 124.05 m 11.38 ft / 3.47 m
Ends: Unarmoured
Main Belt covers 87 % of normal length
- Torpedo Bulkhead:
0.50" / 13 mm 407.00 ft / 124.05 m 21.37 ft / 6.51 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 279 mm 7.00" / 178 mm 12.0" / 305 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm -
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -
- Armour deck: 5.00" / 127 mm, Conning tower: 9.00" / 229 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 98,706 shp / 73,634 Kw = 30.00 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 2,971 tons
Complement:
988 - 1,285
Cost:
£10.724 million / $42.895 million
Distribution of weights at normal displacement:
Armament: 1,936 tons, 7.8 %
Armour: 8,230 tons, 33.1 %
- Belts: 1,928 tons, 7.8 %
- Torpedo bulkhead: 161 tons, 0.6 %
- Armament: 1,530 tons, 6.2 %
- Armour Deck: 4,446 tons, 17.9 %
- Conning Tower: 165 tons, 0.7 %
Machinery: 2,736 tons, 11.0 %
Hull, fittings & equipment: 9,930 tons, 40.0 %
Fuel, ammunition & stores: 2,869 tons, 11.6 %
Miscellaneous weights: 100 tons, 0.4 %
- Hull below water: 100 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
41,432 lbs / 18,793 Kg = 48.0 x 12.0 " / 305 mm shells or 5.7 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 5.1 ft / 1.6 m
Roll period: 16.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.53
Seaboat quality (Average = 1.00): 1.00
Hull form characteristics:
Hull has rise aft of midbreak, low quarterdeck ,
a normal bow and small transom stern
Block coefficient (normal/deep): 0.570 / 0.577
Length to Beam Ratio: 8.01 : 1
'Natural speed' for length: 30.95 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 22.00 degrees
Stern overhang: 3.30 ft / 1.01 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 22.00 %, 26.50 ft / 8.08 m, 14.00 ft / 4.27 m
- Forward deck: 9.00 %, 14.00 ft / 4.27 m, 14.00 ft / 4.27 m
- Aft deck: 48.00 %, 22.00 ft / 6.71 m, 22.00 ft / 6.71 m
- Quarter deck: 21.00 %, 14.00 ft / 4.27 m, 14.00 ft / 4.27 m
- Average freeboard: 18.94 ft / 5.77 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 86.6 %
- Above water (accommodation/working, high = better): 192.1 %
Waterplane Area: 48,061 Square feet or 4,465 Square metres
Displacement factor (Displacement / loading): 115 %
Structure weight / hull surface area: 158 lbs/sq ft or 769 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.03
- 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
Thoughts?
Cheers,