Robert Surcrouf class Heavy Destroyers

[snip]

Ten Ships

--IRS Robert Surcrouf
--IRS François Le Clerc
--IRS René Duguay-Trouin
--IRS Jean Fleury
--IRS Fra Bernardino
--IRS François Aregnaudeau
--IRS Jean Bart
--IRS Jean-François Roberval
--IRS Guglielmo Grasso
--IRS Gabriel Da Parma

HFD-21, Imperial Roman Republic Heavy Destroyer laid down 1921

Displacement:
   2,000 t light; 2,074 t standard; 2,354 t normal; 2,578 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (405.20 ft / 393.70 ft) x 37.07 ft x (13.45 / 14.31 ft)
   (123.50 m / 120.00 m) x 11.30 m  x (4.10 / 4.36 m)

Armament:
      4 - 5.51" / 140 mm 40.0 cal guns - 85.98lbs / 39.00kg shells, 130 per gun
     Quick firing guns in deck mounts, 1917 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      1 - 3.94" / 100 mm 45.0 cal gun - 30.86lbs / 14.00kg shells, 100 per gun
     Anti-air gun in deck mount, 1915 Model
     1 x Single mount on centreline, aft deck forward
      1 raised mount
      4 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 10,000 per gun
     Machine guns in deck mounts, 1911 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 375 lbs / 170 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm   0.20" / 5 mm            -
   2nd:   0.20" / 5 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 45,987 shp / 34,307 Kw = 33.23 kts
   Range 5,500nm at 14.00 kts
   Bunker at max displacement = 505 tons

Complement:
   168 - 219

Cost:
   £0.680 million / $2.720 million

Distribution of weights at normal displacement:
   Armament: 55 tons, 2.3 %
      - Guns: 55 tons, 2.3 %
   Armour: 7 tons, 0.3 %
      - Armament: 7 tons, 0.3 %
   Machinery: 1,300 tons, 55.2 %
   Hull, fittings & equipment: 538 tons, 22.9 %
   Fuel, ammunition & stores: 354 tons, 15.0 %
   Miscellaneous weights: 100 tons, 4.2 %
      - Hull below water: 25 tons
      - On freeboard deck: 75 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     580 lbs / 263 Kg = 6.9 x 5.5 " / 140 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.56
   Metacentric height 2.4 ft / 0.7 m
   Roll period: 10.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.420 / 0.432
   Length to Beam Ratio: 10.62 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): 25.00 degrees
   Stern overhang: 1.94 ft / 0.59 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  20.51 ft / 6.25 m,  20.51 ft / 6.25 m
      - Forward deck:   15.00 %,  20.51 ft / 6.25 m,  20.51 ft / 6.25 m
      - Aft deck:   50.00 %,  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:      14.64 ft / 4.46 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 185.9 %
      - Above water (accommodation/working, high = better): 139.9 %
   Waterplane Area: 9,097 Square feet or 845 Square metres
   Displacement factor (Displacement / loading): 69 %
   Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.26
      - Overall: 0.55
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Misc Weight Distribution
--32t 6x530mm (1913) Torpedo Tubes (2x4 mounts centerline)
--6t 1918 FC
--25t LR Wireless
--15t 1915 Hydrophone
--12t Depth Charges
--3t DC Throwers
--3t Night Fighting Equipment
--5t Construction Reserve