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Chao Phya (ex-Caldwell), Siamese Destroyer laid down 1916 (Engine 1936)
Displacement:
1,100 t light; 1,154 t standard; 1,345 t normal; 1,497 t full load
Dimensions: Length overall / water x beam x draught
315.49 ft / 314.00 ft x 31.10 ft x 9.50 ft (normal load)
96.16 m / 95.71 m x 9.48 m x 2.90 m
Armament:
2 - 3.94" / 100 mm guns in single mounts, 30.86lbs / 14.00kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
2 - 3.94" / 100 mm guns in single mounts, 30.86lbs / 14.00kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.65lbs / 0.75kg shells, 1916 Model
Breech loading guns in deck mounts
on side, evenly spread
8 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1916 Model
Breech loading guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 137 lbs / 62 kg
Shells per gun, main battery: 300
6 - 21.0" / 533 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.39" / 10 mm 1.57" / 40 mm
2nd: 1.57" / 40 mm 0.39" / 10 mm 1.57" / 40 mm
3rd: 0.98" / 25 mm - -
4th: 0.59" / 15 mm - -
- Conning tower: 1.57" / 40 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 26,000 shp / 19,396 Kw = 30.21 kts
Range 2,360nm at 20.00 kts
Bunker at max displacement = 343 tons
Complement:
110 - 144
Cost:
£0.230 million / $0.921 million
Distribution of weights at normal displacement:
Armament: 17 tons, 1.3 %
Armour: 19 tons, 1.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 15 tons, 1.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 4 tons, 0.3 %
Machinery: 629 tons, 46.8 %
Hull, fittings & equipment: 401 tons, 29.8 %
Fuel, ammunition & stores: 245 tons, 18.2 %
Miscellaneous weights: 35 tons, 2.6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
487 lbs / 221 Kg = 16.0 x 3.9 " / 100 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.24
Metacentric height 1.3 ft / 0.4 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.30
Seaboat quality (Average = 1.00): 1.03
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.507
Length to Beam Ratio: 10.10 : 1
'Natural speed' for length: 17.72 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 68
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17.00 ft / 5.18 m
- Forecastle (20 %): 16.00 ft / 4.88 m
- Mid (50 %): 14.00 ft / 4.27 m
- Quarterdeck (15 %): 12.00 ft / 3.66 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 13.98 ft / 4.26 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 164.8 %
- Above water (accommodation/working, high = better): 91.2 %
Waterplane Area: 6,551 Square feet or 609 Square metres
Displacement factor (Displacement / loading): 82 %
Structure weight / hull surface area: 32 lbs/sq ft or 154 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.53
- Longitudinal: 1.94
- Overall: 0.60
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
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Originally posted by Kaiser Kirk
I traditionally complain about high cruising speeds leading to higher peacetime consumption and additional supply line burdens, which mostly is ignored.
Otherwise,
Looks like a pretty decent refit to me.
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Originally posted by Desertfox
Not bad, Mexico however skipped on the engine upgrade. It's probably not worth it, for the speed gained. Money saved can then be spent buying some nice, 'like new', Australian Patrol Boats in great condition.
This post has been edited 1 times, last edit by "Carthaginian" (Apr 17th 2008, 5:45am)
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Originally posted by Hrolf Hakonson
Myself, I'd be a bit wary of reducing the ship's primary weapons (her torpedoes) by 50%. I'd probably try to keep all 4 torpedo banks, and probably settle for only 3 100mm guns, all on the centerline.
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Originally posted by Carthaginian
Quoted
Originally posted by Hrolf Hakonson
Myself, I'd be a bit wary of reducing the ship's primary weapons (her torpedoes) by 50%. I'd probably try to keep all 4 torpedo banks, and probably settle for only 3 100mm guns, all on the centerline.
Well, I did that because these ships are now going to serve primarily as fleet escorts/screening vessels. I can build lighter, more expendable ships for concentrated torpedo attacks if necessary (and am indeed planning on doing so). Does that line of reasoning make good sense?
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Originally posted by Carthaginian
Out of curiosity, do you think that the deck is wide enough for a twin gunhouse? if that's a possibility, I'd just reduce it to two twin mount & hoists and keep the torps the same.
This post has been edited 1 times, last edit by "Carthaginian" (Apr 19th 2008, 5:54am)
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