Light Battlecruiser Ernest Renan

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Ernest Renan, France Croiseur de Combat laid down 1927 (Engine 1923)

 
Displacement:

                17 041 t light; 17 776 t standard; 18 718 t normal; 19 472 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)

                (667,30 ft / 645,41 ft) x 81,20 ft x (24,18 / 24,92 ft)

                (203,39 m / 196,72 m) x 24,75 m  x (7,37 / 7,60 m)

Armament:

      8 - 10,79" / 274 mm 50,0 cal guns - 707,68lbs / 321,00kg shells, 80 per gun

                  Breech loading guns in turret on barbette mounts, 1927 Model

                  1 x Quad mount on sides, forward deck aft

                  1 x Quad mount on sides, aft deck forward

      10 - 5,46" / 139 mm 40,0 cal guns - 89,51lbs / 40,60kg shells, 150 per gun

                  Dual purpose guns in deck and hoist mounts, 1927 Model

                  3 x Twin mounts on centreline ends, majority forward

                               1 raised mount - superfiring

                  2 x Twin mounts on sides, aft deck forward

      24 - 1,57" / 40,0 mm 40,0 cal guns - 1,68lbs / 0,76kg shells, 1 500 per gun

                  Auto rapid fire guns in deck mounts, 1928 Model

                  3 x Quintuple mounts on sides, evenly spread

      12 - 0,52" / 13,2 mm 76,0 cal guns - 0,11lbs / 0,05kg shells, 1 500 per gun

                  Machine guns in deck mounts, 1927 Model

                  6 x Twin mounts on sides, evenly spread

                               6 raised mounts

      Weight of broadside 6 598 lbs / 2 993 kg

      Main Torpedoes

      4 - 21,7" / 550 mm, 26,90 ft / 8,20 m torpedoes - 1,840 t each, 7,359 t total

                In 2 sets of deck mounted carriage/fixed tubes

Armour:

   - Belts:                Width (max)           Length (avg)                         Height (avg)

                Main:      4,92" / 125 mm       153,87 ft / 46,90 m 14,76 ft / 4,50 m

                Ends:      2,76" / 70 mm         265,75 ft / 81,00 m 10,99 ft / 3,35 m

                  225,79 ft / 68,82 m Unarmoured ends

                  Main Belt covers 37% of normal length

                  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:

                               1,18" / 30 mm         395,14 ft / 120,44 m              22,64 ft / 6,90 m

                Beam between torpedo bulkheads 54,13 ft / 16,50 m

   - Gun armour:     Face (max)             Other gunhouse (avg)          Barbette/hoist (max)

                Main:      7,87" / 200 mm       3,54" / 90 mm                        5,91" / 150 mm

                2nd:        0,98" / 25 mm         0,98" / 25 mm                        0,98" / 25 mm

   - Armoured deck - single deck:

                For and Aft decks: 2,99" / 76 mm

   - Conning towers: Forward 5,91" / 150 mm, Aft 0,00" / 0 mm

Machinery:

                Oil fired boilers, steam turbines,

                Electric motors, 3 shafts, 135 099 shp / 100 784 Kw = 32,60 kts

                Range 4 442nm at 15,00 kts

                Bunker at max displacement = 1 696 tons

Complement:

                799 - 1 040

Cost:

                £6,723 million / $26,893 million

Distribution of weights at normal displacement:

                Armament: 1 257 tons, 6,7%

                   - Guns: 1 248 tons, 6,7%

                   - Weapons: 9 tons, 0,0%

                Armour: 3 572 tons, 19,1%

                   - Belts: 910 tons, 4,9%

                   - Torpedo bulkhead: 391 tons, 2,1%

                   - Armament: 588 tons, 3,1%

                   - Armour Deck: 1 594 tons, 8,5%

                   - Conning Tower: 90 tons, 0,5%

                Machinery: 4 515 tons, 24,1%

                Hull, fittings & equipment: 7 596 tons, 40,6%

                Fuel, ammunition & stores: 1 678 tons, 9,0%

                Miscellaneous weights: 100 tons, 0,5%

                   - On freeboard deck: 100 tons

Overall survivability and seakeeping ability:

                Survivability (Non-critical penetrating hits needed to sink ship):

                  18 594 lbs / 8 434 Kg = 29,6 x 10,8 " / 274 mm shells or 1,8 torpedoes

                Stability (Unstable if below 1.00): 1,08

                Metacentric height 4,3 ft / 1,3 m

                Roll period: 16,5 seconds

                Steadiness             - As gun platform (Average = 50 %): 68 %

                                               - Recoil effect (Restricted arc if above 1.00): 0,70

                Seaboat quality  (Average = 1.00): 0,94

Hull form characteristics:

                Hull has rise forward of midbreak,

                  a normal bow and a round stern

                Block coefficient (normal/deep): 0,517 / 0,522

                Length to Beam Ratio: 7,95 : 1

                'Natural speed' for length: 25,40 kts

                Power going to wave formation at top speed: 59 %

                Trim (Max stability = 0, Max steadiness = 100): 72

                Bow angle (Positive = bow angles forward): 23,00 degrees

                Stern overhang: 9,58 ft / 2,92 m

                Freeboard (% = length of deck as a percentage of waterline length):

                                                               Fore end,               Aft end

                   - Forecastle:       16,33%,  29,00 ft / 8,84 m,  24,48 ft / 7,46 m

                   - Forward deck:  42,41%,  24,48 ft / 7,46 m,  27,85 ft / 8,49 m

                   - Aft deck:           22,58%,  16,50 ft / 5,03 m,  16,50 ft / 5,03 m

                   - Quarter deck:   18,68%,  16,50 ft / 5,03 m,  17,52 ft / 5,34 m

                   - Average freeboard:                        22,29 ft / 6,79 m

Ship space, strength and comments:

                Space      - Hull below water (magazines/engines, low = better): 162,0%

                               - Above water (accommodation/working, high = better): 191,8%

                Waterplane Area: 35 467 Square feet or 3 295 Square metres

                Displacement factor (Displacement / loading): 101%

                Structure weight / hull surface area: 154 lbs/sq ft or 752 Kg/sq metre

                Hull strength (Relative):

                               - Cross-sectional: 0,95

                               - Longitudinal: 1,49

                               - Overall: 1,00

                Cramped machinery, storage, compartmentation space

                Excellent accommodation and workspace room

                Poor seaboat, wet and uncomfortable, reduced performance in heavy weather