WesWorld

During 1928-1929 this class of DDs will be launched,

A total of 12 units will be built.

An evolution of the previous 1st class DDs of the Z45 class, this second class destroyers have slightly smaller dimensions and displace 1600 tons standard, yet they carry more weapons and are, in general, more capable than the previous, larger, class.


This destroyers carry 5 125mm DP guns and 8 21'' torpedoes. They are also capable ASW assets with 50 tons of miscelaneous weight invested on depth charges.

This class will replace the ageing Z25 class of destroyers, which will be rebuilt as pure ASW assets.


Z53, Dutch Destroyer laid down 1928

Displacement:
1.525 t light; 1.600 t standard; 1.804 t normal; 1.968 t full load

Dimensions: Length overall / water x beam x draught
379,91 ft / 374,02 ft x 32,81 ft x 13,62 ft (normal load)
115,80 m / 114,00 m x 10,00 m x 4,15 m

Armament:
4 - 4,92" / 125 mm guns in single mounts, 59,52lbs / 27,00kg shells, 1926 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread, 2 raised mounts - superfiring
1 - 4,92" / 125 mm guns in single mounts, 59,52lbs / 27,00kg shells, 1926 Model
Dual purpose gun in deck mount
on centreline amidships
6 - 1,57" / 40,0 mm guns (3x2 guns), 1,95lbs / 0,88kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, all amidships
6 - 0,79" / 20,0 mm guns (3x2 guns), 0,24lbs / 0,11kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 311 lbs / 141 kg
Shells per gun, main battery: 210
8 - 21,0" / 533,4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,79" / 20 mm 0,39" / 10 mm -
2nd: 0,39" / 10 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 40.512 shp / 30.222 Kw = 35,00 kts
Range 4.500nm at 15,00 kts
Bunker at max displacement = 368 tons

Complement:
137 - 179

Cost:
£0,827 million / $3,308 million

Distribution of weights at normal displacement:
Armament: 39 tons, 2,2 %
Armour: 10 tons, 0,5 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 10 tons, 0,5 %
- Armour Deck: 0 tons, 0,0 %
- Conning Tower: 0 tons, 0,0 %
Machinery: 933 tons, 51,7 %
Hull, fittings & equipment: 494 tons, 27,4 %
Fuel, ammunition & stores: 279 tons, 15,5 %
Miscellaneous weights: 50 tons, 2,8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
423 lbs / 192 Kg = 7,1 x 4,9 " / 125 mm shells or 0,3 torpedoes
Stability (Unstable if below 1.00): 1,30
Metacentric height 1,5 ft / 0,5 m
Roll period: 11,2 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0,29
Seaboat quality (Average = 1.00): 1,03

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0,378
Length to Beam Ratio: 11,40 : 1
'Natural speed' for length: 22,21 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 10,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,11 ft / 7,35 m
- Forecastle (20 %): 18,04 ft / 5,50 m
- Mid (45 %): 18,04 ft / 5,50 m (9,51 ft / 2,90 m aft of break)
- Quarterdeck (15 %): 9,51 ft / 2,90 m
- Stern: 9,51 ft / 2,90 m
- Average freeboard: 13,84 ft / 4,22 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 187,0 %
- Above water (accommodation/working, high = better): 76,0 %
Waterplane Area: 7.757 Square feet or 721 Square metres
Displacement factor (Displacement / loading): 62 %
Structure weight / hull surface area: 32 lbs/sq ft or 158 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 1,59
- Overall: 0,56
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

ASDIC?

A capable ship but her BC is on the very edge...

Quoted

Originally posted by HoOmAn
ASDIC?

hummm why not, it was developed by the end of WW1...not sure if by 1928 it was still kept secret by USA and UK, tho. If it was, then there will be no asdic for Z53 .

The BC is because her complying with the treaty. I can bring it a tad up, put the ship at 1650 standard and call it a 1600ton ship, as it is well within the 5% limit. One way or the another it's more or less the same with me, the ship will be even better if I make it a tad larger

I'd suggest increasing the block co-efficient a bit and reducing the other dimensions to compensate. But it's a spanky design otherwise. India will certainly take notice.

I like your choice of main armament. Good to see somebody else not using 130 mm guns...

I changed dimensions a bit, raised BC accordingly and added 5 extra shells for the 125mm guns...


The ship now looks like this:


Z53, Dutch Destroyer laid down 1928

Displacement:
1.535 t light; 1.611 t standard; 1.815 t normal; 1.978 t full load

Dimensions: Length overall / water x beam x draught
378,27 ft / 372,38 ft x 32,81 ft x 13,12 ft (normal load)
115,30 m / 113,50 m x 10,00 m x 4,00 m

Armament:
4 - 4,92" / 125 mm guns in single mounts, 59,52lbs / 27,00kg shells, 1926 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread, 2 raised mounts - superfiring
1 - 4,92" / 125 mm guns in single mounts, 59,52lbs / 27,00kg shells, 1926 Model
Dual purpose gun in deck mount
on centreline amidships
6 - 1,57" / 40,0 mm guns (3x2 guns), 1,95lbs / 0,88kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, all amidships
6 - 0,79" / 20,0 mm guns (3x2 guns), 0,24lbs / 0,11kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 311 lbs / 141 kg
Shells per gun, main battery: 215
8 - 21,0" / 533,4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,79" / 20 mm 0,39" / 10 mm -
2nd: 0,39" / 10 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 41.237 shp / 30.762 Kw = 35,00 kts
Range 4.500nm at 15,00 kts
Bunker at max displacement = 368 tons

Complement:
138 - 180

Cost:
£0,835 million / $3,339 million

Distribution of weights at normal displacement:
Armament: 39 tons, 2,1 %
Armour: 10 tons, 0,5 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 10 tons, 0,5 %
- Armour Deck: 0 tons, 0,0 %
- Conning Tower: 0 tons, 0,0 %
Machinery: 945 tons, 52,0 %
Hull, fittings & equipment: 492 tons, 27,1 %
Fuel, ammunition & stores: 280 tons, 15,4 %
Miscellaneous weights: 50 tons, 2,8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
422 lbs / 191 Kg = 7,1 x 4,9 " / 125 mm shells or 0,3 torpedoes
Stability (Unstable if below 1.00): 1,29
Metacentric height 1,5 ft / 0,5 m
Roll period: 11,3 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0,30
Seaboat quality (Average = 1.00): 1,00

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0,396
Length to Beam Ratio: 11,35 : 1
'Natural speed' for length: 22,10 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 71
Bow angle (Positive = bow angles forward): 10,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,11 ft / 7,35 m
- Forecastle (20 %): 18,04 ft / 5,50 m
- Mid (47 %): 18,04 ft / 5,50 m (9,51 ft / 2,90 m aft of break)
- Quarterdeck (15 %): 9,51 ft / 2,90 m
- Stern: 9,51 ft / 2,90 m
- Average freeboard: 14,01 ft / 4,27 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 188,1 %
- Above water (accommodation/working, high = better): 77,0 %
Waterplane Area: 7.788 Square feet or 724 Square metres
Displacement factor (Displacement / loading): 62 %
Structure weight / hull surface area: 32 lbs/sq ft or 157 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 1,58
- Overall: 0,56
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

ASDIC and SONAR were developed solely by the UK in the 1920s with many working sets being installed in the late twenties. No other country knew about this until WWII. Since things have to remain "fair" it is supposed that everyone has access to this technology.

She seems a fairly capable destroyer.

She´s indeed a very capable design. The RSAN laid down something similar in 1927 - but RAMs design carries more shells per main gun (albeit slightly smaller caliber) and two additional torpedos. Her misc weight compensates for her slightly shorter range... Not a bad choice, though.

Quoted

Originally posted by Red Admiral
ASDIC and SONAR were developed solely by the UK in the 1920s with many working sets being installed in the late twenties. No other country knew about this until WWII. Since things have to remain "fair" it is supposed that everyone has access to this technology.

well, I've done some research on the matter ASDIC was developed during WWI by both USA and UK. The americans called it SONAR while the english ASDIC, but both were bassically the same set. By 1918 both nations had produced a working set and tested it.

First operational ship with a "serial" ASDIC was in 1922, much later than waht I thought. And indeed the details of the device were kept in secret until WW2.


So, no ASDIC for Z53, nor Z25 . Edited the references to the device in both threads.