WesWorld

The United States is building a series of Coast Defense vessels, to be based primarily in the Pacific.

New Ironsides Class, 7,895 tons
M-11 New Ironsides Built 1926-1927
M-12 Monitor Built 1926-1927
Passaic Class, 4,026 tons
M-13 Passaic Built 1926-1927
M-14 Canonicus Built 1926-1927
M-15 Sangamon Built 1926-1927
M-16 Monadnock Built 1927-1928
M-17 Onondaga Built 1927-1928
M-18 Tippecanoe Built 1927-1928

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

USS Passaic, United States Monitor laid down 1926

Displacement:
3,802 t light; 4,026 t standard; 4,091 t normal; 4,143 t full load

Dimensions: Length overall / water x beam x draught
332.00 ft / 332.00 ft x 60.40 ft x 14.00 ft (normal load)
101.19 m / 101.19 m x 18.41 m x 4.27 m

Armament:
2 - 12.00" / 305 mm guns (1x2 guns), 864.00lbs / 391.90kg shells, 1926 Model
Breech loading guns in a turret (on a barbette)
on centreline forward
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, 2 raised mounts - superfiring
Weight of broadside 2,407 lbs / 1,092 kg
Shells per gun, main battery: 100
4 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 11.0" / 279 mm 155.00 ft / 47.24 m 9.00 ft / 2.74 m
Ends: Unarmoured
Main Belt covers 72 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 279 mm 6.00" / 152 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, 3,392 shp / 2,531 Kw = 15.00 kts
Range 1,500nm at 10.00 kts
Bunker at max displacement = 117 tons

Complement:
255 - 332

Cost:
£1.385 million / $5.540 million

Distribution of weights at normal displacement:
Armament: 301 tons, 7.4 %
Armour: 1,548 tons, 37.8 %
- Belts: 745 tons, 18.2 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 244 tons, 6.0 %
- Armour Deck: 499 tons, 12.2 %
- Conning Tower: 61 tons, 1.5 %
Machinery: 108 tons, 2.6 %
Hull, fittings & equipment: 1,795 tons, 43.9 %
Fuel, ammunition & stores: 288 tons, 7.0 %
Miscellaneous weights: 50 tons, 1.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5,324 lbs / 2,415 Kg = 6.2 x 12.0 " / 305 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 3.1 ft / 0.9 m
Roll period: 14.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.31
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.510
Length to Beam Ratio: 5.50 : 1
'Natural speed' for length: 18.22 kts
Power going to wave formation at top speed: 38 %
Trim (Max stability = 0, Max steadiness = 100): 68
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: 12.00 ft / 3.66 m
- Forecastle (24 %): 7.80 ft / 2.38 m
- Mid (50 %): 7.80 ft / 2.38 m
- Quarterdeck (20 %): 7.80 ft / 2.38 m
- Stern: 7.80 ft / 2.38 m
- Average freeboard: 8.20 ft / 2.50 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 71.6 %
- Above water (accommodation/working, high = better): 78.6 %
Waterplane Area: 13,483 Square feet or 1,253 Square metres
Displacement factor (Displacement / loading): 97 %
Structure weight / hull surface area: 109 lbs/sq ft or 530 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.46
- 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