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
QuoteHFD-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