Iaculum Class Scout

[snip]

In the early 1900s, the Imperial Navy had developed a rather desperate need for a fast cruise capable of serving as a Destroyer Leader and fast scout. The Iaculum class was the result of this need. Fast, but poorly armed and armored, the class provided a needed service.

Four Ships:
--IRS Iaculum
--#2 (Sunk of the coast of Veracruz September 1914)
--#3
--#4

Iaculum, Roman Imperial Republic Cruiser laid down 1905

Displacement:
   3,000 t light; 3,097 t standard; 3,387 t normal; 3,619 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (413.39 ft / 410.11 ft) x 42.65 ft x (13.94 / 14.65 ft)
   (126.00 m / 125.00 m) x 13.00 m  x (4.25 / 4.47 m)

Armament:
      2 - 5.51" / 140 mm 50.0 cal guns - 85.98lbs / 39.00kg shells, 200 per gun
     Breech loading guns in deck and hoist mounts, 1902 Model
     2 x Single mounts on centreline ends, evenly spread
      4 - 2.95" / 75.0 mm 50.0 cal guns - 13.23lbs / 6.00kg shells, 350 per gun
     Quick firing guns in deck mounts, 1902 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 225 lbs / 102 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.39" / 10 mm      0.79" / 20 mm
   2nd:   0.59" / 15 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 0.59" / 15 mm
   Forecastle: 0.39" / 10 mm  Quarter deck: 0.39" / 10 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 22,000 shp / 16,412 Kw = 26.08 kts
   Range 3,500nm at 10.00 kts
   Bunker at max displacement = 523 tons (90% coal)

Complement:
   221 - 288

Cost:
   £0.367 million / $1.467 million

Distribution of weights at normal displacement:
   Armament: 64 tons, 1.9 %
      - Guns: 64 tons, 1.9 %
   Armour: 131 tons, 3.9 %
      - Armament: 12 tons, 0.3 %
      - Armour Deck: 119 tons, 3.5 %
   Machinery: 1,715 tons, 50.6 %
   Hull, fittings & equipment: 1,020 tons, 30.1 %
   Fuel, ammunition & stores: 387 tons, 11.4 %
   Miscellaneous weights: 70 tons, 2.1 %
      - Hull below water: 5 tons
      - Hull above water: 10 tons
      - On freeboard deck: 50 tons
      - Above deck: 5 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,487 lbs / 675 Kg = 17.8 x 5.5 " / 140 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.50
   Metacentric height 2.8 ft / 0.8 m
   Roll period: 10.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.11
   Seaboat quality  (Average = 1.00): 1.39

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.486 / 0.494
   Length to Beam Ratio: 9.62 : 1
   'Natural speed' for length: 20.25 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: 1.35 ft / 0.41 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  22.15 ft / 6.75 m,  22.15 ft / 6.75 m
      - Forward deck:   20.00 %,  22.15 ft / 6.75 m,  22.15 ft / 6.75 m
      - Aft deck:   45.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      14.76 ft / 4.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 170.3 %
      - Above water (accommodation/working, high = better): 135.2 %
   Waterplane Area: 11,508 Square feet or 1,069 Square metres
   Displacement factor (Displacement / loading): 84 %
   Structure weight / hull surface area: 56 lbs/sq ft or 273 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 1.31
      - Overall: 0.90
   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

Misc Distribution
--Below Water (5t)
----5t Additional Pumps
--Above Water (10t)
----10t Short-Range Wireless
--On Deck (50t)
----12t 6x450mm Torpedos (45 Pattern B) [Three Single tube mounts per side]
----25t Long-Range Wireless
----13t Construction Reserve
--Above Deck (5t)
----5t Improved Aquisition Structures