DD-H Class

[TacCovert4]

H-Class, Aztec Destroyer laid down 1923

Displacement:
   868 t light; 907 t standard; 1,030 t normal; 1,129 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (303.93 ft / 298.56 ft) x 27.89 ft x (9.02 / 9.66 ft)
   (92.64 m / 91.00 m) x 8.50 m  x (2.75 / 2.94 m)

Armament:
      4 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 200 per gun
     Quick firing guns in deck mounts, 1923 Model
     2 x Twin mounts on centreline ends, evenly spread
      6 - 1.18" / 30.0 mm 50.0 cal guns - 0.87lbs / 0.40kg shells, 1,000 per gun
     Anti-air guns in deck mounts, 1923 Model
     6 x Single mounts on sides, evenly spread
      8 - 0.47" / 12.0 mm 70.0 cal guns - 0.06lbs / 0.03kg shells, 2,000 per gun
     Machine guns in deck mounts, 1923 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 135 lbs / 61 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.06" / 27 mm         -               -

   - Conning towers: Forward 1.06" / 27 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 24,566 shp / 18,326 Kw = 31.00 kts
   Range 4,000nm at 14.00 kts
   Bunker at max displacement = 222 tons

Complement:
   90 - 118

Cost:
   £0.329 million / $1.315 million

Distribution of weights at normal displacement:
   Armament: 24 tons, 2.3 %
      - Guns: 24 tons, 2.3 %
   Armour: 7 tons, 0.7 %
      - Armament: 5 tons, 0.5 %
      - Conning Tower: 2 tons, 0.2 %
   Machinery: 536 tons, 52.0 %
   Hull, fittings & equipment: 260 tons, 25.2 %
   Fuel, ammunition & stores: 162 tons, 15.7 %
   Miscellaneous weights: 42 tons, 4.1 %
      - Hull below water: 5 tons
      - On freeboard deck: 34 tons
      - Above deck: 3 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     277 lbs / 126 Kg = 9.1 x 3.9 " / 100 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.23
   Seaboat quality  (Average = 1.00): 0.90

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.480 / 0.491
   Length to Beam Ratio: 10.71 : 1
   'Natural speed' for length: 17.28 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 78
   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 %,  14.76 ft / 4.50 m,  13.12 ft / 4.00 m
      - Forward deck:   30.00 %,  13.12 ft / 4.00 m,  11.48 ft / 3.50 m
      - Aft deck:   35.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Average freeboard:      12.19 ft / 3.72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 176.4 %
      - Above water (accommodation/working, high = better): 136.8 %
   Waterplane Area: 5,449 Square feet or 506 Square metres
   Displacement factor (Displacement / loading): 58 %
   Structure weight / hull surface area: 26 lbs/sq ft or 127 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.59
      - Overall: 0.56
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

24t - 2 x 3 x 21in HW TT Centerline
5t - Hydrophones
10t - 50 Depth Charges

[TacCovert4]

DE-H, Aztec Escort Destroyer laid down 1923 (1931 Refit)

Displacement:
   890 t light; 924 t standard; 1,049 t normal; 1,149 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (304.23 ft / 298.56 ft) x 27.89 ft x (9.19 / 9.83 ft)
   (92.73 m / 91.00 m) x 8.50 m  x (2.80 / 3.00 m)

Armament:
      4 - 3.54" / 90.0 mm 55.0 cal guns - 24.01lbs / 10.89kg shells, 200 per gun
     Dual purpose guns in deck mounts, 1931 Model
     2 x Twin mounts on centreline ends, evenly spread
      6 - 1.18" / 30.0 mm 50.0 cal guns - 0.86lbs / 0.39kg shells, 1,000 per gun
     Anti-air guns in deck mounts, 1923 Model
     6 x Single mounts on sides, evenly spread
      Weight of broadside 101 lbs / 46 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.06" / 27 mm         -               -

   - Conning towers: Forward 1.06" / 27 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 22,358 shp / 16,679 Kw = 30.25 kts
   Range 4,000nm at 14.00 kts
   Bunker at max displacement = 225 tons

Complement:
   91 - 119

Cost:
   £0.323 million / $1.293 million

Distribution of weights at normal displacement:
   Armament: 21 tons, 2.0 %
      - Guns: 21 tons, 2.0 %
   Armour: 7 tons, 0.7 %
      - Armament: 5 tons, 0.5 %
      - Conning Tower: 2 tons, 0.2 %
   Machinery: 527 tons, 50.2 %
   Hull, fittings & equipment: 263 tons, 25.1 %
   Fuel, ammunition & stores: 159 tons, 15.2 %
   Miscellaneous weights: 72 tons, 6.9 %
      - Hull below water: 25 tons
      - On freeboard deck: 44 tons
      - Above deck: 3 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     311 lbs / 141 Kg = 14.0 x 3.5 " / 90 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 11.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 69 %
         - Recoil effect (Restricted arc if above 1.00): 0.17
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.480 / 0.491
   Length to Beam Ratio: 10.71 : 1
   'Natural speed' for length: 17.28 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   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 %,  15.58 ft / 4.75 m,  14.11 ft / 4.30 m
      - Forward deck:   30.00 %,  14.11 ft / 4.30 m,  11.48 ft / 3.50 m
      - Aft deck:   35.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Average freeboard:      12.52 ft / 3.82 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 171.1 %
      - Above water (accommodation/working, high = better): 137.9 %
   Waterplane Area: 5,449 Square feet or 506 Square metres
   Displacement factor (Displacement / loading): 64 %
   Structure weight / hull surface area: 26 lbs/sq ft or 125 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.70
      - Overall: 0.56
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

16t - 1 x 4 x 21in HW TT Centerline

15t - Enhanced Hydrophones
10t - Sonar
4t - 4 x DC Thrower
24 - 100 x DC

3t - 1918 FC