Koln, German Light Cruiser laid down 1925
Displacement: 7,807 t light; 8,098 t standard; 8,742 t normal; 9,257 t full load
Dimensions: Length overall / water x beam x draught
623.36 ft / 623.36 ft x 62.34 ft x 16.40 ft (normal load) [190.00 m / 190.00 m x 19.00 m x 5.00 m]
Armament:
8 - 5.91" / 150 mm guns (4x2 guns), 102.98lbs / 46.71kg shells, 1925 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 3.46" / 88.0 mm guns (6x2 guns), 20.79lbs / 9.43kg shells, 1923 Model Dual purpose guns in deck mounts with hoists on side, evenly spread
6 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1921 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
6 - 0.79" / 20.0 mm guns (4 mounts), 0.24lbs / 0.11kg shells, 1921 Model Machine guns in deck mounts on side, evenly spread, 4 raised mounts
Weight of broadside 1,084 lbs / 492 kg
Shells per gun, main battery: 180
16 - 23.6" / 600 mm above water torpedoes
Armour:
Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 445.60 ft / 135.82 m 9.22 ft / 2.81 m
Ends: Unarmoured
Main Belt covers 110 % of normal length
Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.94" / 100 mm 1.57" / 40 mm 3.94" / 100 mm
2nd: 1.57" / 40 mm - 1.57" / 40 mm
3rd: 0.79" / 20 mm - -
4th: 0.79" / 20 mm - -
Armour deck: 1.18" / 30 mm, Conning tower: 3.15" / 80 mm
Machinery:
Oil fired boilers, steam turbines, Geared drive, 3 shafts, 75,023 shp / 55,967 Kw = 31.92 kts
Range 8,000nm at 12.00 kts
Bunker at max displacement = 1,159 tons
Complement: 451 - 587
Cost: £2.383 million / $9.531 million
Distribution of weights at normal displacement:
Armament: 136 tons, 1.6 %
Armour: 1,397 tons, 16.0 %
- Belts: 530 tons, 6.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 283 tons, 3.2 %
- Armour Deck: 556 tons, 6.4 %
- Conning Tower: 29 tons, 0.3 %
Machinery: 2,436 tons, 27.9 %
Hull, fittings & equipment: 3,838 tons, 43.9 %
Fuel, ammunition & stores: 935 tons, 10.7 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship): 11,170 lbs / 5,067 Kg = 108.5 x 5.9 " / 150 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 3.3 ft / 1.0 m
Roll period: 14.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 1.10
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.480
Length to Beam Ratio: 10.00: 1
'Natural speed' for length: 24.97 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 64
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.46 ft / 8.37 m
- Forecastle (15 %): 18.70 ft / 5.70 m
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (10 %): 17.49 ft / 5.33 m
- Stern: 17.49 ft / 5.33 m
- Average freeboard: 18.62 ft / 5.67 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 103.0 %
- Above water (accommodation/working, high = better): 124.2 %
Waterplane Area: 25,429 Square feet or 2,362 Square metres
Displacement factor (Displacement / loading): 119 %
Structure weight / hull surface area: 102 lbs/sq ft or 496 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 1.05
- Overall: 1.03
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Koln - completed 1926
Breslau - completed 1926
Kiel - completed 1927
Bremen - completed 1927
During 1941 the four vessels of this class were refitted to the following legend:
Koln - As Refit, German Light Cruiser laid down 1925
Displacement: 7,806 t light; 8,098 t standard; 8,742 t normal; 9,257 t full load
Dimensions: Length overall / water x beam x draught
623.36 ft / 623.36 ft x 62.34 ft x 16.40 ft (normal load) [190.00 m / 190.00 m x 19.00 m x 5.00 m]
Armament:
8 - 5.91" / 150 mm guns (4x2 guns), 102.98lbs / 46.71kg shells, 1925 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 3.46" / 88.0 mm guns (6x2 guns), 20.79lbs / 9.43kg shells, 1923 Model Dual purpose guns in deck mounts on side, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1930 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
12 - 0.79" / 20.0 mm guns (4x3 guns), 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 1,089 lbs / 494 kg
Shells per gun, main battery: 180
8 - 21.0" / 533 mm above water torpedoes
Armour:
Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 445.60 ft / 135.82 m 9.22 ft / 2.81 m
Ends: Unarmoured
Main Belt covers 110 % of normal length
Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.94" / 100 mm 1.57" / 40 mm 3.94" / 100 mm
2nd: 1.57" / 40 mm 1.57" / 40 mm -
3rd: 0.79" / 20 mm - -
4th: 0.79" / 20 mm - -
Armour deck: 1.18" / 30 mm, Conning tower: 3.15" / 80 mm
Machinery:
Oil fired boilers, steam turbines, Geared drive, 3 shafts, 75,023 shp / 55,967 Kw = 31.92 kts
Range 8,000nm at 12.00 kts
Bunker at max displacement = 1,159 tons
Complement: 451 - 587
Cost: £2.384 million / $9.537 million
Distribution of weights at normal displacement:
Armament: 136 tons, 1.6 %
Armour: 1,408 tons, 16.1 %
- Belts: 530 tons, 6.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 293 tons, 3.4 %
- Armour Deck: 556 tons, 6.4 %
- Conning Tower: 29 tons, 0.3 %
Machinery: 2,436 tons, 27.9 %
Hull, fittings & equipment: 3,776 tons, 43.2 %
Fuel, ammunition & stores: 936 tons, 10.7 %
Miscellaneous weights: 50 tons, 0.6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship): 11,086 lbs / 5,029 Kg = 107.7 x 5.9 " / 150 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 3.4 ft / 1.0 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.25
Seaboat quality (Average = 1.00): 1.11
Hull form characteristics:
Hull has raised forecastle, low quarterdeck
Block coefficient: 0.480
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 24.97 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 64
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.46 ft / 8.37 m
- Forecastle (15 %): 18.70 ft / 5.70 m (18.04 ft / 5.50 m aft of break)
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (10 %): 17.49 ft / 5.33 m (18.04 ft / 5.50 m before break)
- Stern: 17.49 ft / 5.33 m
- Average freeboard: 18.61 ft / 5.67 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 103.7 %
- Above water (accommodation/working, high = better): 166.3 %
Waterplane Area: 25,429 Square feet or 2,362 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 100 lbs/sq ft or 488 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.02
- Longitudinal: 1.04
- Overall: 1.03
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Breakdown of Miscellaneous Weight
50 tons for radar installation and associated directors
Refit programme (15%) involves:
Replacement of original light AA outfit with current 20mm and 37mm weapons
Replacement of torpedo carriages (533mm vice 600mm)
Installation of radar and associated gun directors
Service life extension
Cost 1,171 tons; time for refit 73 days
Koln - Refit commenced 10 Jan 1941; completed 24 Mar 1941
Breslau - Refit commenced 10 Apr 1941; completed 22 Jun 1941
Bremen - Refit commenced 10 Jul 1941; completed 21 Sep 1941
Kiel - Refit commenced 1 Oct 1941; completed 13 Dec 1941
This post has been edited 2 times, last edit by "BruceDuncan" (Jan 26th 2012, 9:06pm)