USS New Ironsides, United States Monitor laid down 1926
Displacement:
7,400 t light; 7,895 t standard; 8,023 t normal; 8,126 t full load
Dimensions: Length overall / water x beam x draught
384.13 ft / 380.00 ft x 77.90 ft x 18.00 ft (normal load)
117.08 m / 115.82 m x 23.74 m x 5.49 m
Armament:
6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1911 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
10 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1926 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1926 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 5,863 lbs / 2,659 kg
Shells per gun, main battery: 100
4 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 11.0" / 279 mm 188.00 ft / 57.30 m 10.00 ft / 3.05 m
Ends: Unarmoured
Main Belt covers 76 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 279 mm 7.00" / 178 mm 10.0" / 254 mm
- Armour deck: 2.00" / 51 mm, Conning tower: 11.00" / 279 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 5,025 shp / 3,749 Kw = 15.00 kts
Range 2,000nm at 10.00 kts
Bunker at max displacement = 231 tons
Complement:
423 - 551
Cost:
£3.099 million / $12.397 million
Distribution of weights at normal displacement:
Armament: 733 tons, 9.1 %
Armour: 2,733 tons, 34.1 %
- Belts: 1,008 tons, 12.6 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 882 tons, 11.0 %
- Armour Deck: 748 tons, 9.3 %
- Conning Tower: 95 tons, 1.2 %
Machinery: 161 tons, 2.0 %
Hull, fittings & equipment: 3,723 tons, 46.4 %
Fuel, ammunition & stores: 623 tons, 7.8 %
Miscellaneous weights: 50 tons, 0.6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
8,958 lbs / 4,063 Kg = 10.4 x 12.0 " / 305 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 3.5 ft / 1.1 m
Roll period: 17.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.46
Seaboat quality (Average = 1.00): 1.01
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.527
Length to Beam Ratio: 4.88 : 1
'Natural speed' for length: 19.49 kts
Power going to wave formation at top speed: 37 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 16.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 14.40 ft / 4.39 m
- Forecastle (22 %): 10.00 ft / 3.05 m
- Mid (50 %): 9.50 ft / 2.90 m
- Quarterdeck (12 %): 9.50 ft / 2.90 m
- Stern: 9.50 ft / 2.90 m
- Average freeboard: 10.07 ft / 3.07 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 75.8 %
- Above water (accommodation/working, high = better): 79.3 %
Waterplane Area: 20,220 Square feet or 1,878 Square metres
Displacement factor (Displacement / loading): 89 %
Structure weight / hull surface area: 151 lbs/sq ft or 739 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.60
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform