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