G'day all,
I've for a while now been really curious about designing some sort of capital ship for Sieran. Obviously there's some limitations in what a small nation with limited population and economy could actually afford to construct.
A coastal defense ship would seem perfect however I also have a feeling that the naval officers would desire something more prideful.
As such I've made the following for an idea of a small coastal defense/dreadnought design based upon the Spanish Espana class (with likely identical main gun layout) with guns of the same caliber as the Swedish Sverige class to allow for a bit more armour and speed than the Spanish design. Also looked at the Nassau class for some inspiration.
Unnamed, Socialist Republic of Sieran Coastal Battleship laid down 1912
Displacement:
13,620 t light; 14,558 t standard; 16,277 t normal; 17,653 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(486.00 ft / 480.00 ft) x 83.00 ft x (26.00 / 27.73 ft)
(148.13 m / 146.30 m) x 25.30 m x (7.92 / 8.45 m)
Armament:
8 - 11.14" / 283 mm 45.0 cal guns - 697.45lbs / 316.36kg shells, 150 per gun
Breech loading guns in turret on barbette mounts, 1912 Model
2 x 2-gun mounts on centreline, evenly spread
2 x 2-gun mounts on sides amidships
20 - 4.72" / 120 mm 45.0 cal guns - 53.17lbs / 24.12kg shells, 250 per gun
Breech loading guns in casemate mounts, 1912 Model
20 x Single mounts on sides, evenly spread
20 hull mounts in casemates- Limited use in heavy seas
Weight of broadside 6,643 lbs / 3,013 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 9.00" / 229 mm 210.00 ft / 64.01 m 14.00 ft / 4.27 m
Ends: 6.00" / 152 mm 100.00 ft / 30.48 m 14.00 ft / 4.27 m
170.00 ft / 51.82 m Unarmoured ends
Upper: 6.00" / 152 mm 180.00 ft / 54.86 m 8.00 ft / 2.44 m
Main Belt covers 67 % of normal length
- Torpedo Bulkhead - Additional damage containing bulkheads:
3.00" / 76 mm 180.00 ft / 54.86 m 21.00 ft / 6.40 m
Beam between torpedo bulkheads 75.00 ft / 22.86 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 12.0" / 305 mm - 12.0" / 305 mm
2nd: 6.00" / 152 mm - -
- Armoured deck - multiple decks:
For and Aft decks: 3.00" / 76 mm
- Conning towers: Forward 9.00" / 229 mm, Aft 0.00" / 0 mm
Machinery:
Coal fired boilers, steam turbines,
Geared drive, 3 shafts, 25,283 shp / 18,861 Kw = 21.00 kts
Range 8,000nm at 12.00 kts
Bunker at max displacement = 3,095 tons (100% coal)
Complement:
719 - 936
Cost:
£1.204 million / $4.816 million
Distribution of weights at normal displacement:
Armament: 1,408 tons, 8.7 %
- Guns: 1,408 tons, 8.7 %
Armour: 5,106 tons, 31.4 %
- Belts: 2,063 tons, 12.7 %
- Torpedo bulkhead: 420 tons, 2.6 %
- Armament: 1,368 tons, 8.4 %
- Armour Deck: 1,131 tons, 7.0 %
- Conning Tower: 125 tons, 0.8 %
Machinery: 1,109 tons, 6.8 %
Hull, fittings & equipment: 4,697 tons, 28.9 %
Fuel, ammunition & stores: 2,658 tons, 16.3 %
Miscellaneous weights: 1,300 tons, 8.0 %
- Hull below water: 300 tons
- Hull above water: 250 tons
- On freeboard deck: 450 tons
- Above deck: 300 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
27,912 lbs / 12,661 Kg = 40.4 x 11.1 " / 283 mm shells or 5.4 torpedoes
Stability (Unstable if below 1.00): 1.26
Metacentric height 5.7 ft / 1.8 m
Roll period: 14.5 seconds
Steadiness - As gun platform (Average = 50 %): 74 %
- Recoil effect (Restricted arc if above 1.00): 0.43
Seaboat quality (Average = 1.00): 1.49
Hull form characteristics:
Hull has a flush deck,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.550 / 0.559
Length to Beam Ratio: 5.78 : 1
'Natural speed' for length: 21.91 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -1.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 23.30 %, 20.00 ft / 6.10 m, 17.50 ft / 5.33 m
- Forward deck: 30.00 %, 17.50 ft / 5.33 m, 17.00 ft / 5.18 m
- Aft deck: 24.70 %, 17.00 ft / 5.18 m, 17.00 ft / 5.18 m
- Quarter deck: 22.00 %, 17.00 ft / 5.18 m, 17.00 ft / 5.18 m
- Average freeboard: 17.42 ft / 5.31 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 66.3 %
- Above water (accommodation/working, high = better): 126.2 %
Waterplane Area: 27,804 Square feet or 2,583 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 139 lbs/sq ft or 677 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.92
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
Then an alternate version, reduced deck armour and misc weight in the hull to test the idea of having the turrets be superfiring instead of en echelon.
Unnamed, Socialist Republic of Sieran Coastal Battleship laid down 1912
Displacement:
13,620 t light; 14,558 t standard; 16,277 t normal; 17,653 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(486.00 ft / 480.00 ft) x 83.00 ft x (26.00 / 27.73 ft)
(148.13 m / 146.30 m) x 25.30 m x (7.92 / 8.45 m)
Armament:
8 - 11.14" / 283 mm 45.0 cal guns - 697.45lbs / 316.36kg shells, 150 per gun
Breech loading guns in turret on barbette mounts, 1912 Model
4 x 2-gun mounts on centreline, evenly spread
2 raised mounts
20 - 4.72" / 120 mm 45.0 cal guns - 53.18lbs / 24.12kg shells, 250 per gun
Breech loading guns in casemate mounts, 1912 Model
20 x Single mounts on sides, evenly spread
20 hull mounts in casemates- Limited use in heavy seas
Weight of broadside 6,643 lbs / 3,013 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 9.00" / 229 mm 210.00 ft / 64.01 m 14.00 ft / 4.27 m
Ends: 6.00" / 152 mm 100.00 ft / 30.48 m 14.00 ft / 4.27 m
170.00 ft / 51.82 m Unarmoured ends
Upper: 6.00" / 152 mm 180.00 ft / 54.86 m 8.00 ft / 2.44 m
Main Belt covers 67 % of normal length
- Torpedo Bulkhead - Additional damage containing bulkheads:
3.00" / 76 mm 180.00 ft / 54.86 m 21.00 ft / 6.40 m
Beam between torpedo bulkheads 75.00 ft / 22.86 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 12.0" / 305 mm - 12.0" / 305 mm
2nd: 6.00" / 152 mm - -
- Armoured deck - multiple decks:
For and Aft decks: 2.00" / 51 mm
- Conning towers: Forward 9.00" / 229 mm, Aft 0.00" / 0 mm
Machinery:
Coal fired boilers, steam turbines,
Geared drive, 3 shafts, 25,283 shp / 18,861 Kw = 21.00 kts
Range 8,000nm at 12.00 kts
Bunker at max displacement = 3,095 tons (100% coal)
Complement:
719 - 936
Cost:
£1.204 million / $4.816 million
Distribution of weights at normal displacement:
Armament: 1,408 tons, 8.7 %
- Guns: 1,408 tons, 8.7 %
Armour: 4,927 tons, 30.3 %
- Belts: 2,057 tons, 12.6 %
- Torpedo bulkhead: 420 tons, 2.6 %
- Armament: 1,571 tons, 9.7 %
- Armour Deck: 754 tons, 4.6 %
- Conning Tower: 125 tons, 0.8 %
Machinery: 1,109 tons, 6.8 %
Hull, fittings & equipment: 5,126 tons, 31.5 %
Fuel, ammunition & stores: 2,658 tons, 16.3 %
Miscellaneous weights: 1,050 tons, 6.5 %
- Hull below water: 150 tons
- Hull above water: 250 tons
- On freeboard deck: 450 tons
- Above deck: 200 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
27,222 lbs / 12,348 Kg = 39.4 x 11.1 " / 283 mm shells or 5.4 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 4.9 ft / 1.5 m
Roll period: 15.7 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.55
Seaboat quality (Average = 1.00): 1.42
Hull form characteristics:
Hull has a flush deck,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.550 / 0.559
Length to Beam Ratio: 5.78 : 1
'Natural speed' for length: 21.91 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -1.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 23.30 %, 20.00 ft / 6.10 m, 17.50 ft / 5.33 m
- Forward deck: 30.00 %, 17.50 ft / 5.33 m, 17.00 ft / 5.18 m
- Aft deck: 24.70 %, 17.00 ft / 5.18 m, 17.00 ft / 5.18 m
- Quarter deck: 22.00 %, 17.00 ft / 5.18 m, 17.00 ft / 5.18 m
- Average freeboard: 17.42 ft / 5.31 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 65.3 %
- Above water (accommodation/working, high = better): 126.2 %
Waterplane Area: 27,804 Square feet or 2,583 Square metres
Displacement factor (Displacement / loading): 119 %
Structure weight / hull surface area: 150 lbs/sq ft or 730 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.99
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
Any thoughts/comments/suggestions? She would seem surprisingly steady and stable which would be useful in the Bering and North Pacific. Casemates are of dubious use in such conditions but I'm unsure whether turreted secondaries would work/be too modern for a ship of the era.
_________________ "The first rule is not to lose; The second rule is not to forget the first rule"
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