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