Filipino Romblon-class light cruiser, laid down 1931
Displacement:
5,588 t light; 5,888 t standard; 6,676 t normal; 7,306 t full load
Dimensions: Length overall / water x beam x draught
562.60 ft / 547.08 ft x 54.79 ft x 16.24 ft (normal load)
171.48 m / 166.75 m x 16.70 m x 4.95 m
Armament:
9 - 6.10" / 155 mm guns (3x3 guns), 120.00lbs / 54.43kg shells, 1931 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 3.94" / 100 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1931 Model
Dual purpose guns in deck mounts with hoists
on side ends, evenly spread
2 - 3.94" / 100 mm guns (1x2 guns), 32.00lbs / 14.51kg shells, 1931 Model
Dual purpose guns in a deck mount with hoist
on centreline aft, all raised guns - superfiring
12 - 0.98" / 25.0 mm guns (4x3 guns), 0.57lbs / 0.26kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
12 - 0.54" / 13.7 mm guns in single mounts, 0.11lbs / 0.05kg shells, 1931 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1,408 lbs / 639 kg
Shells per gun, main battery: 200
12 - 24.0" / 610 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.95" / 75 mm 380.58 ft / 116.00 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 107 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.15" / 80 mm 1.97" / 50 mm 2.56" / 65 mm
2nd: 1.18" / 30 mm 0.59" / 15 mm 0.98" / 25 mm
3rd: 1.18" / 30 mm - -
4th: 0.59" / 15 mm - -
- Armour deck: 1.38" / 35 mm, Conning tower: 3.15" / 80 mm
Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Geared drive, 3 shafts, 58,727 shp / 43,810 Kw = 32.05 kts
Range 8,250nm at 15.00 kts (Bunkerage = 1,418 tons)
Complement:
369 - 480
Cost:
£2.538 million / $10.151 million
Distribution of weights at normal displacement:
Armament: 167 tons, 2.5 %
Armour: 1,210 tons, 18.1 %
- Belts: 455 tons, 6.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 211 tons, 3.2 %
- Armour Deck: 520 tons, 7.8 %
- Conning Tower: 24 tons, 0.4 %
Machinery: 1,756 tons, 26.3 %
Hull, fittings & equipment: 2,380 tons, 35.6 %
Fuel, ammunition & stores: 1,088 tons, 16.3 %
Miscellaneous weights: 75 tons, 1.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,363 lbs / 2,886 Kg = 56.0 x 6.1 " / 155 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 2.7 ft / 0.8 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.62
Seaboat quality (Average = 1.00): 1.20
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.480
Length to Beam Ratio: 9.99 : 1
'Natural speed' for length: 26.76 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 59
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.25 ft / 8.00 m
- Forecastle (15 %): 22.64 ft / 6.90 m
- Mid (65 %): 21.16 ft / 6.45 m (14.11 ft / 4.30 m aft of break)
- Quarterdeck (15 %): 14.11 ft / 4.30 m
- Stern: 14.11 ft / 4.30 m
- Average freeboard: 19.50 ft / 5.94 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 106.9 %
- Above water (accommodation/working, high = better): 132.4 %
Waterplane Area: 20,390 Square feet or 1,894 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 73 lbs/sq ft or 358 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.71
- Longitudinal: 1.22
- Overall: 0.75
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
Good seaboat, rides out heavy weather easily