1928 Rebuild of PRS Bugsuk (ex-Nisshin)

Professional

Friday, September 29th 2006, 8:07am

Bugsuk is in the news again!

She's finally being repaired and refitted after the recent torpedo/fire accident. Opportunity is being taken to replace her 100mm AA weapons with new 115mm DPs, and the old 155mm casemate weapons have been replaced with the new 150mm guns. AA armament has been upgraded as well.

Bugsuk, Filipino escort cruiser laid down 1902 (Engine 192

Displacement:
6,836 t light; 7,295 t standard; 8,545 t normal; 9,546 t full load

Dimensions: Length overall / water x beam x draught
362.57 ft / 357.00 ft x 62.00 ft x 23.50 ft (normal load)
110.51 m / 108.81 m x 18.90 m x 7.16 m

Armament:
4 - 8.27" / 210 mm guns (2x2 guns), 300.00lbs / 136.08kg shells, 1928 Model
Breech loading guns in turrets (on barbettes)
on centreline, evenly spread
14 - 5.91" / 150 mm guns in single mounts, 106.92lbs / 48.50kg shells, 1931 Model
Breech loading guns in casemate mounts
on side, evenly spread
10 guns in hull casemates - Limited use in heavy seas
8 - 4.53" / 115 mm guns (4x2 guns), 48.50lbs / 22.00kg shells, 1932 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships
12 - 1.38" / 35.0 mm guns (6x2 guns), 1.32lbs / 0.60kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
16 - 0.54" / 13.7 mm guns (4x4 guns), 0.11lbs / 0.05kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread, 2 raised mounts
Weight of broadside 3,102 lbs / 1,407 kg
Shells per gun, main battery: 150
4 - 24.0" / 610 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 261.00 ft / 79.55 m 10.00 ft / 3.05 m
Ends: 4.50" / 114 mm 96.00 ft / 29.26 m 10.00 ft / 3.05 m
Upper: 5.00" / 127 mm 261.00 ft / 79.55 m 8.00 ft / 2.44 m
Main Belt covers 112 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 6.10" / 155 mm 4.72" / 120 mm 5.00" / 127 mm
2nd: 4.02" / 102 mm 2.99" / 76 mm 4.02" / 102 mm
3rd: 1.18" / 30 mm 0.59" / 15 mm 0.98" / 25 mm
4th: 0.59" / 15 mm - -
5th: 0.59" / 15 mm - -

- Armour deck: 3.94" / 100 mm, Conning tower: 4.75" / 121 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 19,995 shp / 14,916 Kw = 21.22 kts
Range 10,075nm at 15.00 kts
Bunker at max displacement = 2,250 tons

Complement:
443 - 577

Cost:
£0.637 million / $2.549 million

Distribution of weights at normal displacement:
Armament: 370 tons, 4.3 %
Armour: 2,969 tons, 34.7 %
- Belts: 1,280 tons, 15.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 493 tons, 5.8 %
- Armour Deck: 1,153 tons, 13.5 %
- Conning Tower: 43 tons, 0.5 %
Machinery: 622 tons, 7.3 %
Hull, fittings & equipment: 2,775 tons, 32.5 %
Fuel, ammunition & stores: 1,709 tons, 20.0 %
Miscellaneous weights: 100 tons, 1.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,743 lbs / 6,687 Kg = 52.2 x 8.3 " / 210 mm shells or 2.6 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 3.1 ft / 0.9 m
Roll period: 14.8 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.53
Seaboat quality (Average = 1.00): 1.29

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.575
Length to Beam Ratio: 5.76 : 1
'Natural speed' for length: 18.89 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: -2.00 ft / -0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.80 ft / 6.34 m
- Forecastle (18 %): 17.60 ft / 5.36 m
- Mid (50 %): 17.60 ft / 5.36 m
- Quarterdeck (18 %): 17.60 ft / 5.36 m
- Stern: 17.60 ft / 5.36 m
- Average freeboard: 17.83 ft / 5.43 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 59.7 %
- Above water (accommodation/working, high = better): 100.2 %
Waterplane Area: 15,814 Square feet or 1,469 Square metres
Displacement factor (Displacement / loading): 117 %
Structure weight / hull surface area: 112 lbs/sq ft or 547 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 3.33
- Overall: 1.10
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily