D-Class Destroyer

[snip]

The D-Class represent the beginning of a large capability shift in the Imperial Navy's destroyers. Large than any of the preceding classes, they also mount twin torpedo tubes and a new 100mm gun. They are also the first ships to use pure oil firing.

Twenty Ships:

Destroyer D (Oil), Imperial Roman Republic Destroyer laid down 1906

Displacement:
   750 t light; 775 t standard; 850 t normal; 910 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (259.20 ft / 252.62 ft) x 26.25 ft x (11.48 / 12.00 ft)
   (79.00 m / 77.00 m) x 8.00 m  x (3.50 / 3.66 m)

Armament:
      2 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 175 per gun
     Quick firing guns in deck mounts, 1906 Model
     2 x Single mounts on centreline ends, evenly spread
      1 raised mount aft - superfiring
      4 - 1.77" / 45.0 mm 50.0 cal guns - 3.31lbs / 1.50kg shells, 250 per gun
     Quick firing guns in deck mounts, 1905 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 75 lbs / 34 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 20,000 shp / 14,920 Kw = 29.98 kts
   Range 3,000nm at 10.00 kts
   Bunker at max displacement = 135 tons
     Caution: Delicate, lightweight machinery

Complement:
   78 - 102

Cost:
   £0.100 million / $0.400 million

Distribution of weights at normal displacement:
   Armament: 14 tons, 1.7 %
      - Guns: 14 tons, 1.7 %
   Armour: 3 tons, 0.3 %
      - Armament: 3 tons, 0.3 %
   Machinery: 501 tons, 58.9 %
   Hull, fittings & equipment: 188 tons, 22.1 %
   Fuel, ammunition & stores: 100 tons, 11.8 %
   Miscellaneous weights: 45 tons, 5.3 %
      - On freeboard deck: 45 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     165 lbs / 75 Kg = 5.4 x 3.9 " / 100 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.31
   Metacentric height 1.1 ft / 0.3 m
   Roll period: 10.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.13
   Seaboat quality  (Average = 1.00): 0.73

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.391 / 0.400
   Length to Beam Ratio: 9.63 : 1
   'Natural speed' for length: 15.89 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 2.40 ft / 0.73 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Forward deck:   20.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Aft deck:   45.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Quarter deck:   15.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Average freeboard:      10.17 ft / 3.10 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 194.6 %
      - Above water (accommodation/working, high = better): 92.5 %
   Waterplane Area: 4,056 Square feet or 377 Square metres
   Displacement factor (Displacement / loading): 32 %
   Structure weight / hull surface area: 25 lbs/sq ft or 123 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.66
      - Overall: 0.56
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Misc Distribution
--On Deck (45t)
----20t 8x450mm Torpedos [Two twin tube mounts per side]
----10t Short-Range Wireless
----5t Improved spray protections for Torpedo tubes
----10t Construction Reserve.

[snip]

In 1913 all 20 ships of this class were updated to receive 1912 fire control and 530mm torpedo tubes.

Destroyer D (Oil), Imperial Roman Republic Destroyer laid down 1906

Displacement:
   750 t light; 775 t standard; 850 t normal; 910 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (259.20 ft / 252.62 ft) x 26.25 ft x (11.48 / 12.00 ft)
   (79.00 m / 77.00 m) x 8.00 m  x (3.50 / 3.66 m)

Armament:
      2 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 175 per gun
     Quick firing guns in deck mounts, 1906 Model
     2 x Single mounts on centreline ends, evenly spread
      1 raised mount aft - superfiring
      4 - 1.77" / 45.0 mm 50.0 cal guns - 3.31lbs / 1.50kg shells, 250 per gun
     Quick firing guns in deck mounts, 1905 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 75 lbs / 34 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 20,000 shp / 14,920 Kw = 29.98 kts
   Range 3,000nm at 10.00 kts
   Bunker at max displacement = 135 tons
     Caution: Delicate, lightweight machinery

Complement:
   78 - 102

Cost:
   £0.100 million / $0.400 million

Distribution of weights at normal displacement:
   Armament: 14 tons, 1.7 %
      - Guns: 14 tons, 1.7 %
   Armour: 3 tons, 0.3 %
      - Armament: 3 tons, 0.3 %
   Machinery: 501 tons, 58.9 %
   Hull, fittings & equipment: 188 tons, 22.1 %
   Fuel, ammunition & stores: 100 tons, 11.8 %
   Miscellaneous weights: 45 tons, 5.3 %
      - On freeboard deck: 45 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     165 lbs / 75 Kg = 5.4 x 3.9 " / 100 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.31
   Metacentric height 1.1 ft / 0.3 m
   Roll period: 10.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.13
   Seaboat quality  (Average = 1.00): 0.73

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.391 / 0.400
   Length to Beam Ratio: 9.63 : 1
   'Natural speed' for length: 15.89 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 2.40 ft / 0.73 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Forward deck:   20.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Aft deck:   45.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Quarter deck:   15.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Average freeboard:      10.17 ft / 3.10 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 194.6 %
      - Above water (accommodation/working, high = better): 92.5 %
   Waterplane Area: 4,056 Square feet or 377 Square metres
   Displacement factor (Displacement / loading): 32 %
   Structure weight / hull surface area: 25 lbs/sq ft or 123 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.66
      - Overall: 0.56
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Misc Distribution
--On Deck (45t)
----24t 8x530mm Torpedos [Two twin tube mounts per side]
----10t Short-Range Wireless
----5t Improved spray protections for Torpedo tubes
----2t 1912 Fire Control
----4t Construction Reserve.