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1

Monday, December 6th 2010, 4:57am

Destroyers

Ratanakosin, Siam Destroyer laid down 1915 (Engine 1937)

Displacement:
624 t light; 666 t standard; 774 t normal; 861 t full load

Dimensions: Length overall / water x beam x draught
242.78 ft / 239.50 ft x 23.95 ft x 11.81 ft (normal load)
74.00 m / 73.00 m x 7.30 m x 3.60 m

Armament:
4 - 3.94" / 100 mm guns in single mounts, 30.86lbs / 14.00kg shells, 1936 Model
Quick firing guns in deck mounts
on centreline, evenly spread
Aft Main mounts separated by engine room
4 - 2.24" / 57.0 mm guns (2x2 guns), 5.65lbs / 2.56kg shells, 1936 Model
Dual purpose guns in deck mounts
on side, all amidships
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all forward
Weight of broadside 149 lbs / 68 kg
Shells per gun, main battery: 300
4 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.39" / 10 mm -
2nd: 0.98" / 25 mm - -
3rd: 0.98" / 25 mm - -

- Conning tower: 1.57" / 40 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 16,115 shp / 12,022 Kw = 30.00 kts
Range 4,300nm at 15.00 kts
Bunker at max displacement = 194 tons

Complement:
73 - 95

Cost:
£0.123 million / $0.491 million

Distribution of weights at normal displacement:
Armament: 18 tons, 2.4 %
Armour: 16 tons, 2.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 13 tons, 1.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.4 %
Machinery: 336 tons, 43.4 %
Hull, fittings & equipment: 226 tons, 29.1 %
Fuel, ammunition & stores: 150 tons, 19.4 %
Miscellaneous weights: 28 tons, 3.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
228 lbs / 103 Kg = 7.5 x 3.9 " / 100 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 17.90 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 67
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (20 %): 18.04 ft / 5.50 m
- Mid (30 %): 18.04 ft / 5.50 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 12.30 ft / 3.75 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 164.3 %
- Above water (accommodation/working, high = better): 55.2 %
Waterplane Area: 3,664 Square feet or 340 Square metres
Displacement factor (Displacement / loading): 71 %
Structure weight / hull surface area: 25 lbs/sq ft or 124 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 3.83
- Overall: 0.61
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform

10 units in service
You smug-faced crowds with kindling eye
Who cheer when soldier lads march by,
Sneak home and pray you'll never know
The hell where youth and laughter go.
-Siegfried Sassoon

This post has been edited 2 times, last edit by "snip" (Dec 21st 2010, 4:50am)


2

Monday, December 6th 2010, 4:58am

Chomburi DDL, DDL laid down 1921 (Engine 1936)

Displacement:
1,391 t light; 1,452 t standard; 1,600 t normal; 1,719 t full load

Dimensions: Length overall / water x beam x draught
333.86 ft / 320.00 ft x 34.00 ft x 13.00 ft (normal load)
101.76 m / 97.54 m x 10.36 m x 3.96 m

Armament:
6 - 4.72" / 120 mm guns (3x2 guns), 52.72lbs / 23.91kg shells, 1930 Model
Quick firing guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
2 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships
2 - 2.24" / 57.0 mm guns (1x2 guns), 5.65lbs / 2.56kg shells, 1935 Model
Dual purpose guns in a deck mount with hoist
on centreline amidships, all raised guns - superfiring
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 341 lbs / 155 kg
Shells per gun, main battery: 150
6 - 21.0" / 533 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.79" / 20 mm -
2nd: 0.79" / 20 mm 0.79" / 20 mm -
3rd: 0.79" / 20 mm 0.79" / 20 mm -
4th: 0.79" / 20 mm 0.79" / 20 mm -
5th: 0.79" / 20 mm 0.79" / 20 mm -

- Conning tower: 0.79" / 20 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 26,306 shp / 19,624 Kw = 30.00 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 267 tons

Complement:
126 - 164

Cost:
£0.449 million / $1.798 million

Distribution of weights at normal displacement:
Armament: 43 tons, 2.7 %
Armour: 29 tons, 1.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 27 tons, 1.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.1 %
Machinery: 658 tons, 41.1 %
Hull, fittings & equipment: 611 tons, 38.2 %
Fuel, ammunition & stores: 210 tons, 13.1 %
Miscellaneous weights: 50 tons, 3.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
621 lbs / 282 Kg = 11.8 x 4.7 " / 120 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 1.0 ft / 0.3 m
Roll period: 14.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.72
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.396
Length to Beam Ratio: 9.41 : 1
'Natural speed' for length: 17.89 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 30.00 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 (20 %): 18.00 ft / 5.49 m
- Mid (42 %): 18.00 ft / 5.49 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 13.84 ft / 4.22 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 156.7 %
- Above water (accommodation/working, high = better): 79.7 %
Waterplane Area: 6,683 Square feet or 621 Square metres
Displacement factor (Displacement / loading): 84 %
Structure weight / hull surface area: 47 lbs/sq ft or 232 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.65
- Longitudinal: 2.45
- Overall: 0.75
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform

12 units
You smug-faced crowds with kindling eye
Who cheer when soldier lads march by,
Sneak home and pray you'll never know
The hell where youth and laughter go.
-Siegfried Sassoon