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Quoted
HMS Castlerock, British Escort Sloop laid down 1940
Displacement:
1,004 t light; 1,104 t standard; 1,231 t normal; 1,332 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(289.28 ft / 282.00 ft) x 33.00 ft x (11.60 / 12.21 ft)
(88.17 m / 85.95 m) x 10.06 m x (3.54 / 3.72 m)
Armament:
4 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 200 per gun
Dual purpose guns in deck and hoist mounts, 1940 Model
2 x 2 row twin mounts on centreline, forward evenly spread
1 raised mount
8 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 5,000 per gun
Anti-air guns in deck mounts, 1940 Model
1 x Quad mount on centreline, aft deck aft
1 raised mount
1 x Quad mount on centreline, aft deck centre
1 double raised mount
12 - 0.79" / 20.0 mm 45.0 cal guns - 0.25lbs / 0.11kg shells, 10,000 per gun
Anti-air guns in deck mounts, 1940 Model
2 x 2 row twin mounts on sides, forward deck centre
2 raised mounts
4 x 2 row twin mounts on sides, forward deck aft
2 raised mounts - superfiring
Weight of broadside 154 lbs / 70 kg
Main Torpedoes
4 - 21.0" / 533 mm, 21.70 ft / 6.61 m torpedoes - 1.483 t each, 5.934 t total
In 1 sets of deck mounted centre rotating tubes
Main DC/AS Mortars
60 - 420.00 lbs / 190.51 kg Depth Charges - 11.250 t total
in Stern depth charge racks
2nd DC/AS Mortars
60 - 420.00 lbs / 190.51 kg Depth Charges - 11.250 t total
in Depth charge throwers
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.50" / 13 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 21,799 shp / 16,262 Kw = 30.03 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 229 tons
Complement:
103 - 135
Cost:
£0.756 million / $3.022 million
Distribution of weights at normal displacement:
Armament: 91 tons, 7.4 %
- Guns: 49 tons, 3.9 %
- Weapons: 43 tons, 3.5 %
Armour: 2 tons, 0.2 %
- Armament: 2 tons, 0.2 %
Machinery: 535 tons, 43.4 %
Hull, fittings & equipment: 315 tons, 25.6 %
Fuel, ammunition & stores: 227 tons, 18.4 %
Miscellaneous weights: 60 tons, 4.9 %
- Hull below water: 20 tons
- On freeboard deck: 20 tons
- Above deck: 20 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
425 lbs / 193 Kg = 13.3 x 4.0 " / 102 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.26
Metacentric height 1.4 ft / 0.4 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.22
Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and small transom stern
Block coefficient (normal/deep): 0.399 / 0.410
Length to Beam Ratio: 8.55 : 1
'Natural speed' for length: 18.30 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Forward deck: 35.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Aft deck: 30.00 %, 10.00 ft / 3.05 m, 10.00 ft / 3.05 m
- Quarter deck: 15.00 %, 10.00 ft / 3.05 m, 10.00 ft / 3.05 m
- Average freeboard: 15.50 ft / 4.72 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 159.5 %
- Above water (accommodation/working, high = better): 144.7 %
Waterplane Area: 5,855 Square feet or 544 Square metres
Displacement factor (Displacement / loading): 89 %
Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.41
- Longitudinal: 3.19
- Overall: 0.51
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
DC's based on the RN Mk VII Heavy
Miscellaneous weights added to allow for growth of crew, wepons and the fitting of radar
Torpedoes based on RN 21" MkVIII
This post has been edited 2 times, last edit by "Brazen" (Sep 17th 2009, 3:18pm)
This post has been edited 1 times, last edit by "Brazen" (Sep 17th 2009, 3:59pm)
Quoted
Originally posted by Brazen
Thanks, it's quite tricky to use when you don't have a clue what affects cross sectional strength
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