WesWorld

The Philippine Navy is pleased to release the specifications for the D-10-class destroyer, the first of which will be laid down Q2/25.

(OOC: At ship sizes like this, SpringStyle underestimates the speed for a given horsepower. This ship will probably make 33+ knots.)

***

Filipino D-10 class destroyer, design V, laid down 1925

Length, 312 ft x Beam, 30.0 ft x Depth, 12.0 ft
1733 tons normal displacement (1517 tons standard)

Main battery: 2 x 5.10-inch / 130mm (2 x 1)
AA battery: 4 x 1.57-inch / 40mm
Light battery: 2 x 0.98-inch / 25mm

Weight of broadside: 141 lbs

8 TT, 21.0"

Depth charges @ 550lb each: 90

Hull unarmored

Battery armor:
Main, 1.0"
AA, 0.5" shields / light guns, 0.2" shields

Maximum speed for 30138 shp = 30.00 knots
Approximate cruising radius, 7500 nm / 12 kts

Typical complement: 134-175


Estimated cost, $2.430 million (£607,000)

Remarks:

Caution: Hull structure is subject to strain in open-sea
conditions.

Ship has slow, easy roll; a good, steady gun platform.

Good seaboat; rides out heavy weather easily.

Magazines and engineering spaces are cramped, with poor
watertight subdivision.

Cramped ship; poor crew accommodation, limited working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 18 tons = 1 pct
Armor, total ..................... 18 tons = 1 pct

Armament 18 tons = 1 pct

Machinery ........................ 852 tons = 49 pct
Hull and fittings; equipment ..... 558 tons = 32 pct
Fuel, ammunition, stores ......... 263 tons = 15 pct
Miscellaneous weights ............ 25 tons = 1 pct
-----
1733 tons = 100 pct

Estimated metacentric height, 1.1 ft

Displacement summary:

Light ship: 1470 tons
Standard displacement: 1517 tons
Normal service: 1733 tons
Full load: 1899 tons

Loading submergence 177 tons/foot

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.18

Shellfire needed to sink: 714 lbs = 10.8 x 5.1-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.3
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 72 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.49

Relative quality as a seaboat: 1.44

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.54
Sharpness coefficient: 0.34
Hull speed coefficient 'M' = 7.94
'Natural speed' for length = 17.7 knots
Power going to wave formation
at top speed: 69 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 168 percent

Relative accommodation and working space: 63 percent


Displacement factor: 81 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.68
(Structure weight per square
foot of hull surface: 44 lbs)

Relative longitudinal hull strength: 2.29
(for 17.5 ft average freeboard;
freeboard adjustment +6.8 ft)

Relative composite hull strength: 0.77

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

312.00 x 30.00 x 12.00; 17.50 -- Dimensions
0.54 -- Block coefficient
1925 -- Year laid down
30.00 / 7500 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
25 tons -- Miscellaneous weights
++++++++++
2 x 5.10; 2; 0 -- Main battery; turrets
:
0 -- No secondary battery
4 x 1.57 -- Tertiary (QF/AA) battery
Gun-shields
:
2 x 0.98 -- Fourth (light) battery
8 / 0 / 21.00 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
1.00 / 0.00 / 0.50 / 0.20 -- Battery armor


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

When designing destroyers;

Block Coefficient of c. 0.45

Cross-sectional hull strength of above 0.50 ( so design destroyers up to this limit if you want to)

Quoted

Originally posted by Swamphen
(OOC: At ship sizes like this, SpringStyle underestimates the speed for a given horsepower. This ship will probably make 33+ knots.)

Well, actually spring* defines our physics so we got to live with it. However, figures by spring* are for max. displacement - at least that´s how we understand it. So most likely your design will be faster - in light conditions. We just don´t know how much. :o)

Still... Even then 30kn is way too low for a DD.

Listen to RA. He´s right about how to sim a DD.

Filipino D-10 class destroyer Mk.6, laid down 1925

Length, 312 ft x Beam, 30.0 ft x Depth, 12.0 ft
1508 tons normal displacement (1348 tons standard)

Main battery: 2 x 5.10-inch / 130mm (2 x 1)
AA battery: 4 x 1.57-inch / 40mm
Light battery: 2 x 0.98-inch / 25mm

Weight of broadside: 141 lbs

8 TT, 21.0"

Depth charges @ 550lb each: 90

Hull unarmored

Battery armor:
Main, 1.0"
AA, 0.5" shields / light guns, 0.2" shields

Maximum speed for 40009 shp = 33.00 knots
Approximate cruising radius, 6000 nm / 12 kts

Typical complement: 121-157


Estimated cost, $2.345 million (£586,000)

Remarks:

Caution: Hull structure is subject to strain in open-sea
conditions.

Ship has slow, easy roll; a good, steady gun platform.

Magazines and engineering spaces are cramped, with poor
watertight subdivision.

Cramped ship; poor crew accommodation, limited working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 18 tons = 1 pct
Armor, total ..................... 17 tons = 1 pct

Armament 17 tons = 1 pct

Machinery ........................ 847 tons = 56 pct
Hull and fittings; equipment ..... 400 tons = 26 pct
Fuel, ammunition, stores ......... 202 tons = 13 pct
Miscellaneous weights ............ 25 tons = 2 pct
-----
1508 tons = 100 pct

Estimated metacentric height, 1.1 ft

Displacement summary:

Light ship: 1306 tons
Standard displacement: 1348 tons
Normal service: 1508 tons
Full load: 1630 tons

Loading submergence 161 tons/foot

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.15

Shellfire needed to sink: 336 lbs = 5.1 x 5.1-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.2
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.47

Relative quality as a seaboat: 1.08

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.47
Sharpness coefficient: 0.32
Hull speed coefficient 'M' = 8.31
'Natural speed' for length = 17.7 knots
Power going to wave formation
at top speed: 71 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 192 percent

Relative accommodation and working space: 58 percent


Displacement factor: 54 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.50
(Structure weight per square
foot of hull surface: 34 lbs)

Relative longitudinal hull strength: 1.67
(for 16.0 ft average freeboard;
freeboard adjustment +5.6 ft)

Relative composite hull strength: 0.56

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

312.00 x 30.00 x 12.00; 16.00 -- Dimensions
0.47 -- Block coefficient
1925 -- Year laid down
33.00 / 6000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
25 tons -- Miscellaneous weights
++++++++++
2 x 5.10; 2; 0 -- Main battery; turrets; superfiring
:
0 -- No secondary battery
4 x 1.57 -- Tertiary (QF/AA) battery
Gun-shields
:
2 x 0.98 -- Fourth (light) battery
8 / 0 / 21.00 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
1.00 / 0.00 / 0.50 / 0.20 -- Battery armor


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Its better but I still don't like it that much. Here is a destroyer of similar size but 6 years older than your design. Length:beam ratio of 10:1 and a Block coefficient of 0.40. My design makes 34knts with only 800hp more. There is also more armament as 2x130mm is a bit light.

Palestro Class, Italian Destroyer laid down 1919

Displacement:
1,277 t light; 1,320 t standard; 1,395 t normal; 1,450 t full load
Loading submergence 160 tons/feet

Dimensions:
321.52 ft x 32.15 ft x 11.81 ft (normal load)
98.00 m x 9.80 m x 3.60 m

Armament:
6 - 3.94" / 100 mm guns
2 - 0.54" / 14 mm guns
Weight of broadside 183 lbs / 83 kg
4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 40,818 shp / 30,450 Kw = 34.00 kts
Range 4,000nm at 10.00 kts

Complement:
114 - 148

Cost:
£0.388 million / $1.554 million

Distribution of weights at normal displacement:
Armament: 23 tons, 1.6 %
Machinery: 815 tons, 58.4 %
Hull, fittings & equipment: 419 tons, 30.1 %
Fuel, ammunition & stores: 118 tons, 8.5 %
Miscellaneous weights: 20 tons, 1.4 %

Metacentric height 1.3

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is extremely poor
Room for accommodation & workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.21
Shellfire needed to sink: 300 lbs / 136 Kg = 9.8 x 3.9 " / 100 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 74 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.24
Relative quality as seaboat: 1.05

Hull form characteristics:
Block coefficient: 0.400
Sharpness coefficient: 0.30
Hull speed coefficient 'M': 8.79
'Natural speed' for length: 17.93 kts
Power going to wave formation at top speed: 70 %
Trim: 70
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 202.4 %
Relative accommodation and working space: 105.7 %
(Average = 100%)
Displacement factor: 45 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.51
(Structure weight / hull surface area: 36 lbs / square foot or 176 Kg / square metre)
Relative longitudinal hull strength: 1.72
(for 15.42 ft / 4.70 m average freeboard, freeboard adjustment 5.21 ft)
Relative composite hull strength: 0.58