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Repository for data pertaining to subject class of warship

Visayas class, Philippines Armored Cruiser laid down 1941

Displacement: 20,790 t light; 22,044 t standard; 24,516 t normal; 26,494 t full load

Dimensions: Length overall / water x beam x draught

735.08 ft / 716.86 ft x 68.90 ft (Bulges 75.79 ft) x 27.23 ft (normal load) [ 224.05 m / 218.50 m x 21.00 m (Bulges 23.10 m) x 8.30 m]

Armament:

9 - 11.02" / 280 mm guns (3x3 guns), 669.80lbs / 303.82kg shells, 1936 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, 1 raised mount - superfiring
2 - 4.53" / 115 mm guns (1x2 guns), 46.40lbs / 21.05kg shells, 1941 Model Dual purpose guns in a deck mount with hoist on centreline aft, all raised guns - superfiring
12 - 4.53" / 115 mm guns (6x2 guns), 46.40lbs / 21.05kg shells, 1941 Model Dual purpose guns in deck mounts with hoists on side, evenly spread
24 - 1.38" / 35.0 mm guns (6x4 guns), 1.31lbs / 0.59kg shells, 1940 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 6,709 lbs / 3,043 kg
Shells per gun, main battery: 200
8 - 24.0" / 610 mm above water torpedoes

Armour:

Belts: Width (max) Length (avg) Height (avg)
Main: 7.87" / 200 mm 557.74 ft / 170.00 m 12.30 ft / 3.75 m
Ends: Unarmoured
Main Belt covers 120 % of normal length

Torpedo Bulkhead and Bulges: 1.38" / 35 mm 557.74 ft / 170.00 m 26.25 ft / 8.00 m

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.27" / 210 mm 5.12" / 130 mm 8.27" / 210 mm
2nd: 0.98" / 25 mm 0.59" / 15 mm 0.98" / 25 mm
3rd: 0.98" / 25 mm 0.59" / 15 mm 0.98" / 25 mm
4th: 0.39" / 10 mm 0.39" / 10 mm -

Armour deck: 3.15" / 80 mm, Conning tower: 3.15" / 80 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 4 shafts, 139,994 shp / 104,436 Kw = 33.00 kts
Range 13,000nm at 15.00 kts
Bunker at max displacement = 4,449 tons

Complement: 979 - 1,273

Cost: £12.055 million / $48.220 million

Distribution of weights at normal displacement:

Armament: 839 tons, 3.4 %
Armour: 6,549 tons, 26.7 %
- Belts: 2,192 tons, 8.9 %
- Torpedo bulkhead: 746 tons, 3.0 %
- Armament: 1,402 tons, 5.7 %
- Armour Deck: 2,152 tons, 8.8 %
- Conning Tower: 57 tons, 0.2 %
Machinery: 3,700 tons, 15.1 %
Hull, fittings & equipment: 9,303 tons, 37.9 %
Fuel, ammunition & stores: 3,726 tons, 15.2 %
Miscellaneous weights: 400 tons, 1.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 33,596 lbs / 15,239 Kg = 50.2 x 11.0 " / 280 mm shells or 4.4 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 3.4 ft / 1.0 m
Roll period: 17.2 seconds
Steadiness - As gun platform (Average = 50 %): 55 %
- Recoil effect (Restricted arc if above 1.00): 0.85
Seaboat quality (Average = 1.00): 1.17

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.580
Length to Beam Ratio: 9.46: 1
'Natural speed' for length: 30.42 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 47
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.71 ft / 8.75 m
- Forecastle (20 %): 26.25 ft / 8.00 m
- Mid (50 %): 24.28 ft / 7.40 m
- Quarterdeck (15 %): 24.28 ft / 7.40 m
- Stern: 24.28 ft / 7.40 m
- Average freeboard: 25.16 ft / 7.67 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 110.8 %
- Above water (accommodation/working, high = better): 151.8 %
Waterplane Area: 36,934 Square feet or 3,431 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 148 lbs/sq ft or 721 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.52
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Breakdown of miscellaneous weight:

Reserved for installation of radar and other electronics - 100 tons
Aviation facilities - three scouting aircraft, catapults and cranes located aft - 200 tons
Tropicalization - 100 tons


Visayas – Laid down 1 January 1941; Launched 27 December 1941; Completed 20 June 1943
Mindanao – Laid down 1 January 1941; Launched 27 December 1941; Completed 20 June 1943
Bohol - Laid down 1 April 1942; Launched 27 March 1943; Completed 17 September 1944
Samal - Laid down 1 October 1942; Completed 19 March 1945