Start mid 1919, in Callao Shipyards 2 x 6" cruisers -
Cuntisuyu & Collasuyu
Note that NUS Admiralty choose, with the armament disposition, the possibility to engage 3 DDs.
Fore & aft 6" turrets could engage 2 differents targets & the middle 120mm guns had the own directory fire control for a third target.
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7200t, NUS Light Cruiser laid down 1919 (Engine 1916)
Displacement:
7 200 t light; 7 485 t standard; 8 256 t normal; 8 874 t full load
Dimensions: Length overall / water x beam x draught
556.36 ft / 554.46 ft x 55.45 ft x 19.18 ft (normal load)
169.58 m / 169.00 m x 16.90 m x 5.85 m
Armament:
8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1919 Model
Quick firing guns in deck mounts with hoists
on centreline, evenly spread, 2 raised mounts
Aft Main mounts separated by engine room
2 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1919 Model
Quick firing guns in deck mounts with hoists
on side, all amidships
2 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1919 Model
Quick firing guns in deck mounts with hoists
on centreline, all amidships
4 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1919 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1 083 lbs / 491 kg
Shells per gun, main battery: 190
12 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 459.32 ft / 140.00 m 9.19 ft / 2.80 m
Ends: Unarmoured
Main Belt covers 127 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
2nd: 1.57" / 40 mm 0.79" / 20 mm 1.97" / 50 mm
3rd: 1.57" / 40 mm 0.79" / 20 mm 1.97" / 50 mm
4th: 0.79" / 20 mm - -
5th: 0.50" / 13 mm - -
- Armour deck: 0.98" / 25 mm, Conning tower: 3.15" / 80 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 75 960 shp / 56 666 Kw = 31.93 kts
Range 8 500nm at 12.00 kts
Bunker at max displacement = 1 389 tons
Complement:
432 - 562
Cost:
£1.662 million / $6.650 million
Distribution of weights at normal displacement:
Armament: 135 tons, 1.6 %
Armour: 991 tons, 12.0 %
- Belts: 533 tons, 6.5 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 60 tons, 0.7 %
- Armour Deck: 370 tons, 4.5 %
- Conning Tower: 28 tons, 0.3 %
Machinery: 2 830 tons, 34.3 %
Hull, fittings & equipment: 2 995 tons, 36.3 %
Fuel, ammunition & stores: 1 056 tons, 12.8 %
Miscellaneous weights: 249 tons, 3.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5 920 lbs / 2 685 Kg = 54.8 x 6.0 " / 152 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 2.7 ft / 0.8 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.37
Seaboat quality (Average = 1.00): 1.01
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.490
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 23.55 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.65 ft / 6.60 m
- Forecastle (20 %): 20.01 ft / 6.10 m
- Mid (50 %): 15.75 ft / 4.80 m
- Quarterdeck (18 %): 15.75 ft / 4.80 m
- Stern: 15.75 ft / 4.80 m
- Average freeboard: 17.37 ft / 5.30 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 127.4 %
- Above water (accommodation/working, high = better): 109.8 %
Waterplane Area: 20 299 Square feet or 1 886 Square metres
Displacement factor (Displacement / loading): 103 %
Structure weight / hull surface area: 92 lbs/sq ft or 450 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.26
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
100t -fire control
25t -Marconi long range
24t - torpedoes
20t - for 60 depth charges
80t - for 80 mines
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