WesWorld

I prefer a knockoff of the British-designed Rhodos-class (built for Greece).

Quoted

Rhodos Class, Great Britain/ Greece Fast Minelayer laid down 1940

Displacement:
2,743 t light; 2,883 t standard; 3,182 t normal; 3,422 t full load

Dimensions: Length overall / water x beam x draught
434.10 ft / 425.00 ft x 39.00 ft x 15.00 ft (normal load)
132.31 m / 129.54 m x 11.89 m x 4.57 m

Armament:
6 - 5.00" / 127 mm guns (3x2 guns), 59.90lbs / 27.17kg shells, 1935 Model
Quick firing guns in deck mounts
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 2.14lbs / 0.97kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.27lbs / 0.12kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 379 lbs / 172 kg
Shells per gun, main battery: 350

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

- Armour deck: 0.79" / 20 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 60,007 shp / 44,765 Kw = 34.05 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 539 tons

Complement:
211 - 275

Cost:
£2.078 million / $8.314 million

Distribution of weights at normal displacement:
Armament: 49 tons, 1.5 %
Armour: 170 tons, 5.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 16 tons, 0.5 %
- Armour Deck: 154 tons, 4.8 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,494 tons, 47.0 %
Hull, fittings & equipment: 930 tons, 29.2 %
Fuel, ammunition & stores: 439 tons, 13.8 %
Miscellaneous weights: 100 tons, 3.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,144 lbs / 519 Kg = 18.3 x 5.0 " / 127 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.39
Metacentric height 2.2 ft / 0.7 m
Roll period: 11.1 seconds
Steadiness - As gun platform (Average = 50 %): 69 %
- Recoil effect (Restricted arc if above 1.00): 0.26
Seaboat quality (Average = 1.00): 1.54

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.448
Length to Beam Ratio: 10.90 : 1
'Natural speed' for length: 20.62 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.00 ft / 7.62 m
- Forecastle (20 %): 21.50 ft / 6.55 m
- Mid (50 %): 20.00 ft / 6.10 m
- Quarterdeck (15 %): 11.00 ft / 3.35 m (20.00 ft / 6.10 m before break)
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 19.46 ft / 5.93 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 168.4 %
- Above water (accommodation/working, high = better): 193.9 %
Waterplane Area: 10,555 Square feet or 981 Square metres
Displacement factor (Displacement / loading): 82 %
Structure weight / hull surface area: 39 lbs/sq ft or 190 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.66
- Overall: 0.59
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Class Names: Rhodos, Kos, Naxos, Kerpathos, Kythira, Keffalonia, Kerkyra, Lafkada
Misc Weight for 150 mines and two radar sets

Quoted

I prefer a knockoff of the British-designed Rhodos-class (built for Greece).

Agreed. A vessel of this size minimizes the investment required to fulfill the mission. If additional mine capacity is required, perhaps a slightly reduced maximum speed could be accepted and the savings put there.

I haven't any idea how long it might take to lay a mine, but allowing a minute per the original RM proposals, with more than 300 mines carried, would require five hours of uninterupted operations in enemy waters to fully lay their 'eggs'. That could be asking a lot in the face of hostile sea and air patrols.

Quoted

Originally posted by BruceDuncan
I haven't any idea how long it might take to lay a mine, but allowing a minute per the original RM proposals, with more than 300 mines carried, would require five hours of uninterupted operations in enemy waters to fully lay their 'eggs'. That could be asking a lot in the face of hostile sea and air patrols.

As it has two launching chutes, that time would be cut in half.

Like this.
Myself I'd perfer to stick some rails on existing DD's instead of their DC fits but this has a certain charm to it.

Adventure, Great Britain Fast Minelayer laid down 1941

Displacement:
2,763 t light; 2,886 t standard; 3,182 t normal; 3,420 t full load

Dimensions: Length overall / water x beam x draught
434.10 ft / 425.00 ft x 39.00 ft x 15.00 ft (normal load)
132.31 m / 129.54 m x 11.89 m x 4.57 m

Armament:
6 - 4.50" / 114 mm guns (3x2 guns), 45.00lbs / 20.41kg shells, 1935 Model
Dual purpose guns in deck mounts
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 2.00lbs / 0.91kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
12 - 0.66" / 16.8 mm guns (2x6 guns), 0.14lbs / 0.07kg shells, 1935 Model
Machine guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 288 lbs / 131 kg
Shells per gun, main battery: 350

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

- Armour deck: 0.79" / 20 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 60,000 shp / 44,760 Kw = 34.05 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 534 tons

Complement:
211 - 275

Cost:
£2.078 million / $8.313 million

Distribution of weights at normal displacement:
Armament: 36 tons, 1.1 %
Armour: 168 tons, 5.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 14 tons, 0.4 %
- Armour Deck: 154 tons, 4.8 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,492 tons, 46.9 %
Hull, fittings & equipment: 937 tons, 29.4 %
Fuel, ammunition & stores: 419 tons, 13.2 %
Miscellaneous weights: 130 tons, 4.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,185 lbs / 537 Kg = 26.0 x 4.5 " / 114 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.35
Metacentric height 2.1 ft / 0.6 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.20
Seaboat quality (Average = 1.00): 1.53

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.448
Length to Beam Ratio: 10.90 : 1
'Natural speed' for length: 20.62 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 46
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.00 ft / 7.62 m
- Forecastle (20 %): 21.50 ft / 6.55 m
- Mid (50 %): 20.00 ft / 6.10 m
- Quarterdeck (15 %): 11.00 ft / 3.35 m (20.00 ft / 6.10 m before break)
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 19.46 ft / 5.93 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 165.9 %
- Above water (accommodation/working, high = better): 193.9 %
Waterplane Area: 10,555 Square feet or 981 Square metres
Displacement factor (Displacement / loading): 85 %
Structure weight / hull surface area: 39 lbs/sq ft or 191 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 2.68
- Overall: 0.60
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Misc Weight for 150 mines and two radar sets

Yes, spot-on, IMHO. Fast, utilitarian, and economical.

Stupid me, but what is wrong with the historical Manxman design? Isn´t she exavtly what you are looking for?

As RN you have the lucury of having historical designs at hand. I´d use this potential.

Quoted

Originally posted by HoOmAn
Stupid me, but what is wrong with the historical Manxman design? Isn´t she exavtly what you are looking for?

As RN you have the lucury of having historical designs at hand. I´d use this potential.

With the disclaimer that I haven't tried to do so yet, but I suspect it may be impossible to actually sim the Manxman class due to it's speed. Springsharp's ability to handle speeds over 30, 32 knots is dodgy at best.

I've gotten pretty close in dimensions and vital statistics, but my sims generally run around 34-36 knots, rather lower than historical.

The need for anti-aircraft cruisers to escort the carrier fleet is of prime concern to the Admiralty at this time.
Work is underway on three of the five Minotaur Class AA cruisers and a follow-on class of five more are planned for completion before or during 1944 when the Audacious Class carriers complete.

The current refitted Ceres and Curacoa class cruisers will need replacing by that time. To fill the need for an additional sqaudron of cruisers fit for modern AA needs it has been decided to rebuild an older class of cruiser.
The DNC picked one of the classes equipped with twin turrets as these have shorter lives remaining and are less powerful than the triple turret armed cruisers of the 1930s. The F's have been disposed of, the G's are currently being given a modest life extension for Colonial and policing duties, the I's were felt to be too short and cramped therefore leaving the six H's for conversion. It is possible only five will be refitted to fit into the new five-ship division structure.

Here is the DNC's favoured rebuild plan;

H Class, Great Britain Light Cruiser laid down 1928 (Engine 1940)

Displacement:
7,754 t light; 8,063 t standard; 9,632 t normal; 10,887 t full load

Dimensions: Length overall / water x beam x draught
609.28 ft / 598.00 ft x 59.00 ft x 19.50 ft (normal load)
185.71 m / 182.27 m x 17.98 m x 5.94 m

Armament:
8 - 5.50" / 140 mm guns (4x2 guns), 83.19lbs / 37.73kg shells, 1940 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 2.24" / 57.0 mm guns (6x2 guns), 6.00lbs / 2.72kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
12 - 1.57" / 40.0 mm guns (6x2 guns), 2.00lbs / 0.91kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 762 lbs / 345 kg
Shells per gun, main battery: 260
8 - 24.5" / 622.3 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.00" / 51 mm 415.00 ft / 126.49 m 10.00 ft / 3.05 m
Ends: Unarmoured
Main Belt covers 107 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm
2nd: 0.50" / 13 mm 0.50" / 13 mm -
3rd: 0.50" / 13 mm 0.50" / 13 mm -

- Armour deck: 2.00" / 51 mm, Conning tower: 2.00" / 51 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 85,000 shp / 63,410 Kw = 32.33 kts
Range 12,000nm at 16.00 kts
Bunker at max displacement = 2,824 tons

Complement:
485 - 631

Cost:
£2.608 million / $10.431 million

Distribution of weights at normal displacement:
Armament: 111 tons, 1.2 %
Armour: 1,365 tons, 14.2 %
- Belts: 341 tons, 3.5 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 142 tons, 1.5 %
- Armour Deck: 862 tons, 8.9 %
- Conning Tower: 20 tons, 0.2 %
Machinery: 2,273 tons, 23.6 %
Hull, fittings & equipment: 3,670 tons, 38.1 %
Fuel, ammunition & stores: 1,878 tons, 19.5 %
Miscellaneous weights: 335 tons, 3.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,274 lbs / 6,475 Kg = 171.6 x 5.5 " / 140 mm shells or 1.8 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 3.2 ft / 1.0 m
Roll period: 13.8 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.24
Seaboat quality (Average = 1.00): 1.33

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.490
Length to Beam Ratio: 10.14 : 1
'Natural speed' for length: 24.45 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 53
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.00 ft / 9.45 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (58 %): 24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
- Quarterdeck (15 %): 16.00 ft / 4.88 m
- Stern: 16.00 ft / 4.88 m
- Average freeboard: 21.20 ft / 6.46 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 90.3 %
- Above water (accommodation/working, high = better): 148.9 %
Waterplane Area: 23,296 Square feet or 2,164 Square metres
Displacement factor (Displacement / loading): 135 %
Structure weight / hull surface area: 94 lbs/sq ft or 457 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.54
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Rebuild Notes
All four twin 6in turrets replaced by Canadian 5.5in automatic twin mounts
All 4in twins and both octuple 2pdr replaced by twin 6pdr Mk III AA mounts
Twelve twin 2pdr mounts added
Main armoured deck increased by 1in to 2in total thickness
1in armour added to main barbettes
2in protected CT added to superstructure
New boilers and tubines fitted based on Minoaur Class machinery with uprated output and higher boiler pressure
Foward superstructure partially rebuit with new bridge and internal changes including the addition of a Combat Information Room and a new command space

Automatic mounts simmed with 10 tons per mount
Misc weight for 8 reload torpedoes and handling gear
Misc weight for one floatplane and one fixed traverse catapult aft

Electronic Equipment
One Aerial Search Type 271M set
One Surface Search (High Definition) Type 274 set
One Surface/ Aerial Search Type 272 set
Two Gunnery Director Radio Location Type 285 sets
Two Gunnery Director Radio Location Type 283 sets
Four Gunnery Director Radio Location Type 282 sets
HF/DF Type 292
Passive Radio Intercept Type 293 series
Passive Radio-Location Type 294 series
VHF Direction Finder Type 295

A new submarine (yes its SS, I've had it simmed about a year ago now and I've not yet mastered subsim). It's an improved U Class with some alterations.

V Class , Great Britain Medium Submarine laid down 1941

Displacement:
702 t light; 719 t standard; 798 t normal; 860 t full load

Dimensions: Length overall / water x beam x draught
170.00 ft / 170.00 ft x 22.00 ft x 13.50 ft (normal load)
51.82 m / 51.82 m x 6.71 m x 4.11 m

Armament:
1 - 4.00" / 102 mm guns in single mounts, 31.00lbs / 14.06kg shells, 1930 Model
Quick firing gun in deck mount
on centreline forward
2 - 0.66" / 16.8 mm guns (1x2 guns), 0.14lbs / 0.06kg shells, 1935 Model
Machine guns in deck mount
on centreline amidships
Weight of broadside 31 lbs / 14 kg
Shells per gun, main battery: 100
5 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:

- Conning tower: 1.00" / 25 mm

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 1 shaft, 2,000 shp / 1,492 Kw = 16.16 kts
Range 7,500nm at 10.00 kts
Bunker at max displacement = 141 tons

Complement:
74 - 97

Cost:
£0.219 million / $0.874 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.5 %
Armour: 2 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 53 tons, 6.6 %
Hull, fittings & equipment: 448 tons, 56.2 %
Fuel, ammunition & stores: 96 tons, 12.0 %
Miscellaneous weights: 195 tons, 24.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
274 lbs / 124 Kg = 8.6 x 4.0 " / 102 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.5 ft / 0.2 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 0 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.553
Length to Beam Ratio: 7.73 : 1
'Natural speed' for length: 13.04 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 120.8 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 2,540 Square feet or 236 Square metres
Displacement factor (Displacement / loading): 238 %
Structure weight / hull surface area: 118 lbs/sq ft or 576 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.92
- Longitudinal: 3.00
- Overall: 3.20
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability

Operational diving depth 320 feet
Emergency diving depth 512 feet
Crush depth 800 feet

Submarine ASDIC Type 150
Four Hydrophone Mk.IV