WesWorld

One unit of this type will be laid down in 1921.

I realize that this is an odd design, even for a monitor, but apart from its shore bombardment applications, the ship is intended to test out some new gun mounts that aren't in service. Note that the 4.1" guns should be a pair of twin mounts...


Monitor, laid down 1921

Length, 360 ft x Beam, 63.0 ft x Depth, 12.0 ft
4277 tons normal displacement (4057 tons standard)

Main battery: 3 x 9.8-inch (1 x 3)
Secondary battery: 2 x 5.9-inch (1 x 2)
AA battery: 4 x 4.1-inch
Light battery: 4 x 1.4-inch

Weight of broadside: 1760 lbs

Main belt, 4.0 inches; ends unarmored
Armor deck, average 2.0 inches
C.T., 4.0 inches

Battery armor:
Main, 8.0" / secondary, 3.0"
AA, 1.0" shields / light guns, 1.0" shields

Maximum speed for 6980 shp = 18.00 knots
Approximate cruising radius, 4000 nm / 12 kts

Typical complement: 264-344


Estimated cost, $3.588 million (£897,000)

Remarks:

Relative extent of belt armor, 63 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Good seaboat; rides out heavy weather easily.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.

Ship is roomy, with superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 220 tons = 5 pct
Armor, total ..................... 1152 tons = 27 pct

Belt 247 tons = 6 pct
Deck 562 tons = 13 pct
C.T. 23 tons = 1 pct
Armament 320 tons = 7 pct

Machinery ........................ 240 tons = 6 pct
Hull and fittings; equipment ..... 2182 tons = 51 pct
Fuel, ammunition, stores ......... 452 tons = 11 pct
Miscellaneous weights ............ 30 tons = 1 pct
-----
4277 tons = 100 pct

Estimated metacentric height, 3.7 ft

Displacement summary:

Light ship: 3825 tons
Standard displacement: 4057 tons
Normal service: 4277 tons
Full load: 4436 tons

Loading submergence 434 tons/foot

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Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.24

Shellfire needed to sink: 8692 lbs = 18.5 x 9.8-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 2.4
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 74 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.30

Relative quality as a seaboat: 1.23

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Hull form characteristics:

Block coefficient: 0.55
Sharpness coefficient: 0.42
Hull speed coefficient 'M' = 6.78
'Natural speed' for length = 19.0 knots
Power going to wave formation
at top speed: 45 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 59 percent

Relative accommodation and working space: 126 percent


Displacement factor: 123 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.00
(Structure weight per square
foot of hull surface: 113 lbs)

Relative longitudinal hull strength: 1.65
(for 11.5 ft average freeboard;
freeboard adjustment -1.3 ft)

Relative composite hull strength: 1.05

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[Machine-readable parameters: Spring Style v. 1.2.1]

360.00 x 63.00 x 12.00; 11.50 -- Dimensions
0.55 -- Block coefficient
1921 -- Year laid down
18.00 / 4000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
30 tons -- Miscellaneous weights
++++++++++
3 x 9.80; 1 -- Main battery; turrets
Central positioning of guns
:
2 x 5.90; 1 -- Secondary battery; turrets
:
4 x 4.10 -- Tertiary (QF/AA) battery
Gun-shields
:
4 x 1.40 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
4.00 / 0.00 / 0.00 / 0.00; 63 -- Belt armor; relative extent
2.00 / 4.00 -- Deck / CT
8.00 / 3.00 / 1.00 / 1.00 -- Battery armor


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