Naval Auxiliaries

[Darman]

Abigail, Egypt Mine Warfare Vessel laid down 1921 (Engine 1912)

Displacement:
   2,827 t light; 2,910 t standard; 3,503 t normal; 3,977 t full load

Dimensions: Length overall / water x beam x draught
   422.06 ft / 418.00 ft x 40.00 ft x 12.00 ft (normal load)
   128.64 m / 127.41 m x 12.19 m  x 3.66 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1921 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1921 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships
      8 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1921 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 144 lbs / 65 kg
   Shells per gun, main battery: 150
   2 - 18.0" / 457.2 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm   0.50" / 13 mm            -

   - Conning tower: 1.00" / 25 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 31,261 shp / 23,321 Kw = 28.00 kts
   Range 1,000nm at 28.00 kts
   Bunker at max displacement = 1,067 tons

Complement:
   226 - 295

Cost:
   £0.735 million / $2.938 million

Distribution of weights at normal displacement:
   Armament: 18 tons, 0.5 %
   Armour: 13 tons, 0.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 8 tons, 0.2 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 5 tons, 0.1 %
   Machinery: 1,246 tons, 35.6 %
   Hull, fittings & equipment: 1,245 tons, 35.6 %
   Fuel, ammunition & stores: 676 tons, 19.3 %
   Miscellaneous weights: 304 tons, 8.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,947 lbs / 1,337 Kg = 92.1 x 4.0 " / 102 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 67 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality  (Average = 1.00): 1.34

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0.611
   Length to Beam Ratio: 10.45 : 1
   'Natural speed' for length: 20.45 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      23.00 ft / 7.01 m
      - Forecastle (20 %):   25.00 ft / 7.62 m (15.00 ft / 4.57 m aft of break)
      - Mid (50 %):      14.31 ft / 4.36 m
      - Quarterdeck (15 %):   14.31 ft / 4.36 m
      - Stern:      14.31 ft / 4.36 m
      - Average freeboard:   16.39 ft / 5.00 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 128.8 %
      - Above water (accommodation/working, high = better): 141.5 %
   Waterplane Area: 12,355 Square feet or 1,148 Square metres
   Displacement factor (Displacement / loading): 119 %
   Structure weight / hull surface area: 58 lbs/sq ft or 284 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.78
      - Overall: 1.02
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Good seaboat, rides out heavy weather easily

150t= 150 mines
50t= minesweeping gear
100t= 50 passenger/cargo compartment
4t= 18in torpedoes