1922 Monitor/CD ships

Intermediate

Tuesday, October 12th 2004, 11:32pm

Two units laid down in 1922. Intended as shore bombardment and coast defence vessels, and perhaps as convoy escorts against surface raiders.

HMS General Picton
HMS General Pakenham

British Monitor/CDS laid down 1922

Displacement:
5.680 t light; 6.000 t standard; 7.680 t normal; 8.994 t full load

Dimensions: Length overall / water x beam x draught
350,00 ft / 350,00 ft x 80,00 ft x 15,00 ft (normal load)
106,68 m / 106,68 m x 24,38 m x 4,57 m

Armament:
2 - 12,00" / 305 mm guns (1x2 guns), 864,00lbs / 391,90kg shells, 1922 Model
Breech loading guns in a turret (on a barbette)
on centreline forward
6 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 1,57" / 40,0 mm guns (2x4 guns), 1,94lbs / 0,88kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on centreline, all aft
8 - 0,79" / 20,0 mm guns (4x2 guns), 0,24lbs / 0,11kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 1.937 lbs / 879 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 13,5" / 343 mm 150,00 ft / 45,72 m 8,00 ft / 2,44 m
Ends: Unarmoured
Main Belt covers 66 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 14,0" / 356 mm 8,00" / 203 mm 12,0" / 305 mm
2nd: 2,00" / 51 mm - -
3rd: 1,00" / 25 mm - -
4th: 0,50" / 13 mm - -

- Armour deck: 3,00" / 76 mm, Conning tower: 10,00" / 254 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 10.823 shp / 8.074 Kw = 18,00 kts
Range 12.420nm at 15,00 kts (Bunkerage = 3.025 tons)

Complement:
409 - 533

Cost:
£1,237 million / $4,949 million

Distribution of weights at normal displacement:
Armament: 242 tons, 3,2 %
Armour: 2.460 tons, 32,0 %
- Belts: 861 tons, 11,2 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 354 tons, 4,6 %
- Armour Deck: 1.161 tons, 15,1 %
- Conning Tower: 84 tons, 1,1 %
Machinery: 367 tons, 4,8 %
Hull, fittings & equipment: 2.610 tons, 34,0 %
Fuel, ammunition & stores: 2.000 tons, 26,0 %
Miscellaneous weights: 0 tons, 0,0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
20.759 lbs / 9.416 Kg = 24,0 x 12,0 " / 305 mm shells or 4,8 torpedoes
Stability (Unstable if below 1.00): 1,57
Metacentric height 7,7 ft / 2,3 m
Steadiness - As gun platform (Average = 50 %): 61 %
- Recoil effect (Restricted arc if above 1.00): 0,08
Seaboat quality (Average = 1.00): 1,22

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0,640
Length to Beam Ratio: 4,38 : 1
'Natural speed' for length: 18,71 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 24,00 ft / 7,32 m
- Forecastle (30 %): 20,00 ft / 6,10 m (10,00 ft / 3,05 m aft of break)
- Mid (50 %): 10,00 ft / 3,05 m
- Quarterdeck (10 %): 10,00 ft / 3,05 m
- Stern: 10,00 ft / 3,05 m
- Average freeboard: 13,48 ft / 4,11 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 41,2 %
- Above water (accommodation/working, high = better): 97,4 %
Waterplane Area: 20.923 Square feet or 1.944 Square metres
Displacement factor (Displacement / loading): 150 %
Structure weight / hull surface area: 102 lbs/sq ft or 499 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,93
- Longitudinal: 1,80
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily