WesWorld

So I have started work on some AA refits for my cruisers. First on the list is the Maha Chakrkri Class. Main focus here was a conversion of the main 120mm battery to DP and a life-extension refit. The most conservative refit just changes this and nothing else. A more gung-ho approach sees an increase in both the 120mm battery and other light AA as well as providing hoists for the main guns. This should help with the AA coverage of my small fleet. Refits are below, whit the original report located here

Maha Chakrkri (DP only), Thai Light Cruiser AA refit laid down 1914

Displacement:
3,612 t light; 3,750 t standard; 4,532 t normal; 5,157 t full load

Dimensions: Length overall / water x beam x draught
420.00 ft / 420.00 ft x 41.50 ft x 16.25 ft (normal load)
128.02 m / 128.02 m x 12.65 m x 4.95 m

Armament:
4 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1936 Model
Dual purpose guns in deck mounts
on centreline, evenly spread, 2 raised mounts
Aft Main mounts separated by engine room
4 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1936 Model
Dual purpose guns in deck mounts
on side, all amidships
6 - 2.24" / 57.0 mm guns (3x2 guns), 5.65lbs / 2.56kg shells, 1935 Model
Dual purpose guns in deck mounts
on centreline, evenly spread, all raised mounts
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 459 lbs / 208 kg
Shells per gun, main battery: 166
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 330.00 ft / 100.58 m 8.00 ft / 2.44 m
Ends: 2.50" / 64 mm 90.00 ft / 27.43 m 8.00 ft / 2.44 m
Main Belt covers 121 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm - -
2nd: 1.00" / 25 mm - -
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -

- Armour deck: 1.00" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 38,407 shp / 28,651 Kw = 28.50 kts
Range 7,070nm at 15.00 kts
Bunker at max displacement = 1,407 tons

Complement:
276 - 359

Cost:
£0.486 million / $1.943 million

Distribution of weights at normal displacement:
Armament: 57 tons, 1.3 %
Armour: 651 tons, 14.4 %
- Belts: 388 tons, 8.6 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 36 tons, 0.8 %
- Armour Deck: 227 tons, 5.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,479 tons, 32.6 %
Hull, fittings & equipment: 1,414 tons, 31.2 %
Fuel, ammunition & stores: 920 tons, 20.3 %
Miscellaneous weights: 10 tons, 0.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,137 lbs / 1,876 Kg = 78.5 x 4.7 " / 120 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.42
Metacentric height 2.5 ft / 0.7 m
Roll period: 11.1 seconds
Steadiness - As gun platform (Average = 50 %): 61 %
- Recoil effect (Restricted arc if above 1.00): 0.14
Seaboat quality (Average = 1.00): 1.22

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.560
Length to Beam Ratio: 10.12 : 1
'Natural speed' for length: 20.49 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 24.00 ft / 7.32 m
- Forecastle (30 %): 22.00 ft / 6.71 m (14.00 ft / 4.27 m aft of break)
- Mid (50 %): 14.00 ft / 4.27 m
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 16.64 ft / 5.07 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 116.3 %
- Above water (accommodation/working, high = better): 90.5 %
Waterplane Area: 12,279 Square feet or 1,141 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 63 lbs/sq ft or 306 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.85
- Overall: 0.99
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily

Cost: 903t
Time: 3.153 months

Maha Chakrkri (DP+Mount armor+Hoists+Additional light AA), Thai Light Cruiser AA refit laid down 1914

Displacement:
3,600 t light; 3,750 t standard; 4,532 t normal; 5,157 t full load

Dimensions: Length overall / water x beam x draught
420.00 ft / 420.00 ft x 41.50 ft x 16.25 ft (normal load)
128.02 m / 128.02 m x 12.65 m x 4.95 m

Armament:
6 - 4.72" / 120 mm guns (4 mounts), 52.72lbs / 23.91kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on centreline, evenly spread, 2 raised mounts
Aft Main mounts separated by engine room
4 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships
8 - 2.24" / 57.0 mm guns (4x2 guns), 5.65lbs / 2.56kg shells, 1935 Model
Dual purpose guns in deck mounts
on centreline, evenly spread, all raised mounts
24 - 0.79" / 20.0 mm guns (12x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 578 lbs / 262 kg
Shells per gun, main battery: 166
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 330.00 ft / 100.58 m 8.00 ft / 2.44 m
Ends: 2.50" / 64 mm 90.00 ft / 27.43 m 8.00 ft / 2.44 m
Main Belt covers 121 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 0.50" / 13 mm 1.00" / 25 mm
2nd: 1.00" / 25 mm 0.50" / 13 mm 1.00" / 25 mm
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -

- Armour deck: 1.00" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 38,407 shp / 28,651 Kw = 28.50 kts
Range 7,070nm at 15.00 kts
Bunker at max displacement = 1,407 tons

Complement:
276 - 359

Cost:
£0.501 million / $2.005 million

Distribution of weights at normal displacement:
Armament: 72 tons, 1.6 %
Armour: 654 tons, 14.4 %
- Belts: 388 tons, 8.6 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 39 tons, 0.9 %
- Armour Deck: 227 tons, 5.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,479 tons, 32.6 %
Hull, fittings & equipment: 1,384 tons, 30.5 %
Fuel, ammunition & stores: 932 tons, 20.6 %
Miscellaneous weights: 10 tons, 0.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,496 lbs / 1,586 Kg = 66.3 x 4.7 " / 120 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.34
Metacentric height 2.2 ft / 0.7 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.35
Seaboat quality (Average = 1.00): 1.19

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.560
Length to Beam Ratio: 10.12 : 1
'Natural speed' for length: 20.49 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 24.00 ft / 7.32 m
- Forecastle (30 %): 22.00 ft / 6.71 m (14.00 ft / 4.27 m aft of break)
- Mid (50 %): 14.00 ft / 4.27 m
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 16.64 ft / 5.07 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 118.8 %
- Above water (accommodation/working, high = better): 90.5 %
Waterplane Area: 12,279 Square feet or 1,141 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 61 lbs/sq ft or 300 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 1.75
- Overall: 0.90
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate

Cost: 900t
Time: 3.15 months