WesWorld

The block coefficient is way too low, it should be up around .40 at a minimum.

You've got 6 twin mountings for your 4.5" guns, but only 6 guns, change that to either 3 twin mountings or 6 singles (I'd recommend the former, personally).

Speed is very low for a destroyer, design speeds for most 1942-period destroyers was at least 34 knots if not higher. I'd aim for 35 knots.

Once you've got those changes made, let's see what you have....

Kind of slow.
You set the Trim pretty high, going for a steady gun platform well that is a subjective choice.

Using mix of 114mm and 100mm those two are in the same class of AA guns. Targeting maybe difficult.
Lots of AA 40mm and 20mm If they fit on this hull I be surprised.

More TT that you can wave a stick at.
When I put 21 on a cruiser It was an issue.

Range is extensive...

Block coefficency well... dont get me started, there are others around that will not like it, suffice to say it is not allowed by "Design Rules For Gentlemen"(TM)

Edit:

33 kt is a speed that at this point is default for this period.

The 100mms should probably be ditched entirely, a destroyer is unlikely to carry two calibers so close together, and it's not going to have enough room for all those weapons.

The 40mm battery has 24 barrels (which is too many for a ship of this size) and but only 12 single mounts.

The torpedoes are too short to be of any real value except as short-ranged ASW weapons like the US Mk. 24 "Fido", and you certainly don't need 20 tubes for that useage.

me think that you can have a medium caliber gun to replace both the 88 and 40mms. For my design (see the Siamese Large Destroyer thread) I have 8x 125mm, 55mm, and 25mm guns.

Or, and probably better, remove the 88s and add another twin turret of 114s.

The 40mm and 20mm guns need more ammunition probably at least 1200 rounds, 2000 would be better.

Quoted

Originally posted by Hrolf Hakonson
Or, and probably better, remove the 88s and add another twin turret of 114s.

The 40mm and 20mm guns need more ammunition probably at least 1200 rounds, 2000 would be better.

so probably 8 x 114mm, 8~12 x 40mms, and 8~12 x 20 mm?

perhaps also 2 more torpedoes to a total of 8.

Sounds about right, yes.

Another area to look at is the gunhouses for the 114mms: right now, they're apparently open to the weather, and have no hoists to provide ammunition to the mounting. You probably should change the mounts to mount & hoist mountings, and give the gunhouses some side/rear armor (say 20-25mm).

I modified my Siamese Large Destroyer design to be laid down at 1942 and carry the weapons of your choice, with some of them somewhat modified. For example, your torpedoes are way too short. Usually I give the length as diameter x 15.

She's built for speed @ 37 knots. Reasonable range is maintained at 8500 nm @ 15 knots.

Enter ship name, RSR Large Destroyer laid down 1942

Displacement:
2,865 t light; 3,000 t standard; 3,481 t normal; 3,865 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(519.89 ft / 505.25 ft) x 45.93 ft x (13.12 / 14.03 ft)
(158.46 m / 154.00 m) x 14.00 m x (4.00 / 4.28 m)

Armament:
8 - 4.49" / 114 mm 45.0 cal guns - 45.59lbs / 20.68kg shells, 250 per gun
Dual purpose guns in deck and hoist mounts, 1942 Model
2 x Twin mounts on centreline, forward deck forward
1 raised mount - superfiring
2 x Twin mounts on centreline, aft deck aft
1 raised mount aft - superfiring
8 - 1.57" / 40.0 mm 70.0 cal guns - 2.19lbs / 0.99kg shells, 1,200 per gun
Anti-air guns in deck mounts, 1942 Model
2 x Quad mounts on centreline, evenly spread
2 raised mounts
8 - 0.79" / 20.0 mm 80.0 cal guns - 0.28lbs / 0.13kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1942 Model
4 x Twin mounts on sides, evenly spread
4 raised mounts
Weight of broadside 384 lbs / 174 kg
Main Torpedoes
8 - 22.8" / 580 mm, 28.54 ft / 8.70 m torpedoes - 2.204 t each, 17.632 t total
In 2 sets of deck mounted centre rotating tubes
Main DC/AS Mortars
20 - 440.92 lbs / 200.00 kg Depth Charges + 20 reloads - 7.874 t total
in Stern depth charge racks

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 0.98" / 25 mm
2nd: 0.79" / 20 mm - -
3rd: 0.39" / 10 mm - -

- Conning towers: Forward 0.79" / 20 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 67,847 shp / 50,614 Kw = 37.00 kts
Range 8,500nm at 14.00 kts
Bunker at max displacement = 865 tons

Complement:
226 - 294

Cost:
£2.392 million / $9.567 million

Distribution of weights at normal displacement:
Armament: 137 tons, 3.9%
- Guns: 91 tons, 2.6%
- Weapons: 45 tons, 1.3%
Armour: 33 tons, 0.9%
- Armament: 29 tons, 0.8%
- Conning Tower: 4 tons, 0.1%
Machinery: 1,703 tons, 48.9%
Hull, fittings & equipment: 954 tons, 27.4%
Fuel, ammunition & stores: 615 tons, 17.7%
Miscellaneous weights: 40 tons, 1.1%
- On freeboard deck: 20 tons
- Above deck: 20 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,135 lbs / 515 Kg = 25.1 x 4.5 " / 114 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.44
Metacentric height 2.9 ft / 0.9 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.21
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and large transom stern
Block coefficient (normal/deep): 0.400 / 0.415
Length to Beam Ratio: 11.00 : 1
'Natural speed' for length: 25.80 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00%, 27.89 ft / 8.50 m, 21.65 ft / 6.60 m
- Forward deck: 20.00%, 21.65 ft / 6.60 m, 21.65 ft / 6.60 m
- Aft deck: 45.00%, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Quarter deck: 15.00%, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Average freeboard: 17.03 ft / 5.19 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 168.9%
- Above water (accommodation/working, high = better): 160.2%
Waterplane Area: 14,825 Square feet or 1,377 Square metres
Displacement factor (Displacement / loading): 88%
Structure weight / hull surface area: 41 lbs/sq ft or 201 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 0.90
- Overall: 0.53
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room

Apologies for jumping in...but how's this look?

Enter ship name, Enter country Enter ship type laid down 1942

Displacement:
2,836 t light; 3,000 t standard; 3,558 t normal; 4,004 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(397.93 ft / 395.34 ft) x 37.99 ft x (20.41 / 22.05 ft)
(121.29 m / 120.50 m) x 11.58 m x (6.22 / 6.72 m)

Armament:
8 - 4.49" / 114 mm 45.0 cal guns - 45.64lbs / 20.70kg shells, 250 per gun
Dual purpose guns in deck mounts, 1942 Model
4 x Twin mounts on centreline ends, evenly spread
2 raised mounts - superfiring
16 - 1.57" / 40.0 mm 70.0 cal guns - 2.20lbs / 1.00kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1942 Model
4 x Quad mounts on sides, evenly spread
8 - 0.79" / 20.0 mm 50.0 cal guns - 0.33lbs / 0.15kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1942 Model
8 x Single mounts on sides, evenly spread
4 raised mounts
Weight of broadside 403 lbs / 183 kg
Main Torpedoes
8 - 22.8" / 580 mm, 25.63 ft / 7.81 m torpedoes - 2.000 t each, 16.000 t total
In 2 sets of deck mounted centre rotating tubes
Main DC/AS Mortars
20 - 320.00 lbs / 145.15 kg Depth Charges + 22 reloads - 6.000 t total
in Stern depth charge racks

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm -
3rd: 0.79" / 20 mm - -
4th: 0.79" / 20 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 74,000 shp / 55,204 Kw = 35.74 kts
Range 10,000nm at 14.00 kts
Bunker at max displacement = 1,005 tons

Complement:
229 - 299

Cost:
£2.419 million / $9.678 million

Distribution of weights at normal displacement:
Armament: 109 tons, 3.1 %
- Guns: 69 tons, 1.9 %
- Weapons: 40 tons, 1.1 %
Armour: 34 tons, 1.0 %
- Armament: 34 tons, 1.0 %
Machinery: 1,855 tons, 52.1 %
Hull, fittings & equipment: 837 tons, 23.5 %
Fuel, ammunition & stores: 722 tons, 20.3 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
954 lbs / 433 Kg = 21.1 x 4.5 " / 114 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.46
Metacentric height 2.3 ft / 0.7 m
Roll period: 10.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.25
Seaboat quality (Average = 1.00): 1.19

Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and small transom stern
Block coefficient (normal/deep): 0.406 / 0.423
Length to Beam Ratio: 10.41 : 1
'Natural speed' for length: 21.45 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 59
Bow angle (Positive = bow angles forward): 6.00 degrees
Stern overhang: -2.99 ft / -0.91 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 25.00 %, 24.61 ft / 7.50 m, 20.18 ft / 6.15 m
- Forward deck: 39.00 %, 20.18 ft / 6.15 m, 20.18 ft / 6.15 m
- Aft deck: 21.00 %, 12.30 ft / 3.75 m, 12.30 ft / 3.75 m
- Quarter deck: 15.00 %, 12.30 ft / 3.75 m, 12.30 ft / 3.75 m
- Average freeboard: 17.79 ft / 5.42 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 176.2 %
- Above water (accommodation/working, high = better): 107.6 %
Waterplane Area: 9,490 Square feet or 882 Square metres
Displacement factor (Displacement / loading): 87 %
Structure weight / hull surface area: 40 lbs/sq ft or 197 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.74
- Overall: 0.59
Cramped machinery, storage, compartmentation space
Adequate accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform