WesWorld

This kinda came up during a chat with Wes over the IRC and I wondered if anyone would be amused at a design contest, since we haven't had any of those in a while. Soooo:

The Bulgarian Royal Navy requests interested potential contractors to submit designs for a fast minelayer meeting the following specifications:

Dimensions and Displacement:
Maximum length shall be 145 meters (475 feet) and L:B Ratio shall be no greater than 1:10. Displacement shall be 4,000 tons or less.

Armament:
- Main battery shall be three twin 105mm dual-purpose turrets (3x2) or three twin 130mm/L45 dual-purpose turrets. Guns of other sizes are not in use by Bulgaria and therefore are not preferred. At least 300 rounds per gun (and preferably 350 RPG) are specified.
- Secondary or AA weapons shall be composed of at least eight 40mm guns in raised twin mounts. Twin 88mm AA guns may be used at the designer's discretion, but are not required by this RfP.
- Miscellaneous weight for 150 Obrazets 1937 (FMO-37/950) naval mines, weighing 950kg or 2094 lbs, shall be reserved. Fewer numbers of mines shall be tolerated if the designs are exceptional in all other ways.

Propulsion:
Oil-fired steam turbines are specified, running two shafts. A high flank speed of at least 34 knots and preferably 36+ knots is required. Range shall be 1,000 nm at 27-30 knots or 5,000 nm at 15 knots.

Other Requirements:
- A transom stern is a no-no for this design. Mines shall be laid through stern chutes and doors.
- 5 tons miscellaneous weight should be reserved for hydrophones, with the option to fit DC stern racks instead of mines.
- At least 10 tons shall be reserved for electronic gear (possibly radar) to be added as topweight in 1943 or later.
- Stability shall be at least 1.10 and steadiness shall be at least 50. Seakeeping shall preferably be 1.00 or higher but some tolerance shall be permitted.
- No preference is shown for flush decks or split-decked designs.
- Torpedoes are viewed as extraneous to the stated role of this vessel and none are required.


------------------


In other words, I've spec'd an Abdiel-class minelayer. Anybody up for the challenge?

The Bulgarian Navy has one existing proposal which meets the above specifications. Should a suitable design be presented, the Bulgarian Navy will evaluate it for possible construction in late 1938 or 1938, but no order is 100% assured.

Escept for caliber size and speed your RfP is almost identincal to a fast mine layer the RSAN ordered in 1936. With minor changes - like no transome, your calibers and range - this will be a possible result. As you can see she lacks in speed compared to your requirements.

Displacement:
4.095 t light; 4.221 t standard; 4.609 t normal; 4.920 t full load

Dimensions: Length overall / water x beam x draught
456,03 ft / 442,91 ft x 49,21 ft x 15,42 ft (normal load)
139,00 m / 135,00 m x 15,00 m x 4,70 m

Armament:
6 - 4,13" / 105 mm guns (3x2 guns), 35,32lbs / 16,02kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 2 raised mounts - superfiring
8 - 1,57" / 40,0 mm guns (4x2 guns), 1,95lbs / 0,88kg shells, 1936 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0,79" / 20,0 mm guns (4x2 guns), 0,24lbs / 0,11kg shells, 1936 Model
Breech loading guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 229 lbs / 104 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,98" / 25 mm 1,18" / 30 mm
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -

- Armour deck: 0,39" / 10 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 67.161 shp / 50.102 Kw = 32,86 kts
Range 5.000nm at 15,00 kts
Bunker at max displacement = 700 tons

Complement:
279 - 363

Cost:
£2,274 million / $9,095 million

Distribution of weights at normal displacement:
Armament: 29 tons, 0,6%
Armour: 127 tons, 2,8%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 23 tons, 0,5%
- Armour Deck: 104 tons, 2,3%
- Conning Tower: 0 tons, 0,0%
Machinery: 1.884 tons, 40,9%
Hull, fittings & equipment: 1.855 tons, 40,2%
Fuel, ammunition & stores: 514 tons, 11,2%
Miscellaneous weights: 200 tons, 4,3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3.129 lbs / 1.419 Kg = 88,6 x 4,1 " / 105 mm shells or 0,7 torpedoes
Stability (Unstable if below 1.00): 1,13
Metacentric height 2,2 ft / 0,7 m
Roll period: 14,0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,15
Seaboat quality (Average = 1.00): 1,01

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,480
Length to Beam Ratio: 9,00 : 1
'Natural speed' for length: 21,05 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 25,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,61 ft / 7,50 m
- Forecastle (30%): 18,70 ft / 5,70 m
- Mid (50%): 17,72 ft / 5,40 m
- Quarterdeck (15%): 17,72 ft / 5,40 m
- Stern: 17,72 ft / 5,40 m
- Average freeboard: 18,82 ft / 5,74 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 142,2%
- Above water (accommodation/working, high = better): 174,3%
Waterplane Area: 14.264 Square feet or 1.325 Square metres
Displacement factor (Displacement / loading): 107%
Structure weight / hull surface area: 75 lbs/sq ft or 366 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,91
- Longitudinal: 2,30
- Overall: 1,00
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

Here's HDW's entry:

Danube, Rumanian Minelayer laid down 1938

Displacement:
3,345 t light; 3,491 t standard; 3,832 t normal; 4,104 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(493.21 ft / 475.72 ft) x 47.57 ft x (13.94 / 14.62 ft)
(150.33 m / 145.00 m) x 14.50 m x (4.25 / 4.46 m)

Armament:
6 - 4.13" / 105 mm 65.0 cal guns - 39.16lbs / 17.76kg shells, 350 per gun
Dual purpose guns in deck and hoist mounts, 1938 Model
3 x Twin mounts on centreline ends, majority forward
2 raised mounts - superfiring
12 - 1.57" / 40.0 mm 60.0 cal guns - 2.14lbs / 0.97kg shells, 1,200 per gun
Anti-air guns in deck mounts, 1938 Model
6 x Twin mounts on sides, evenly spread
20 - 0.79" / 20.0 mm 89.0 cal guns - 0.28lbs / 0.13kg shells, 2,000 per gun
Machine guns in deck mounts, 1938 Model
3 x 2 row quad mounts on centreline, evenly spread
3 raised mounts
4 x Twin mounts on side ends, evenly spread
4 double raised mounts
Weight of broadside 266 lbs / 121 kg
Mines
200 - 2,094.39 lbs / 950.00 kg mines - 186.999 t total
in Above water - Stern racks/rails

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
3rd: 0.79" / 20 mm - -
4th: 0.39" / 10 mm - -

- Conning towers: Forward 2.76" / 70 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 75,731 shp / 56,495 Kw = 35.50 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 613 tons

Complement:
243 - 316

Cost:
£2.436 million / $9.743 million

Distribution of weights at normal displacement:
Armament: 324 tons, 8.4 %
- Guns: 90 tons, 2.3 %
- Weapons: 234 tons, 6.1 %
Armour: 41 tons, 1.1 %
- Armament: 26 tons, 0.7 %
- Conning Tower: 15 tons, 0.4 %
Machinery: 1,991 tons, 52.0 %
Hull, fittings & equipment: 965 tons, 25.2 %
Fuel, ammunition & stores: 487 tons, 12.7 %
Miscellaneous weights: 25 tons, 0.7 %
- Hull below water: 10 tons
- Above deck: 15 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,065 lbs / 483 Kg = 30.1 x 4.1 " / 105 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.36
Metacentric height 2.8 ft / 0.9 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.17
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has a flush deck,
a normal bow and a round stern
Block coefficient (normal/deep): 0.425 / 0.434
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 21.81 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 68
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 24.61 ft / 7.50 m, 19.69 ft / 6.00 m
- Forward deck: 30.00 %, 19.69 ft / 6.00 m, 16.40 ft / 5.00 m
- Aft deck: 35.00 %, 16.40 ft / 5.00 m, 16.40 ft / 5.00 m
- Quarter deck: 15.00 %, 16.40 ft / 5.00 m, 16.40 ft / 5.00 m
- Average freeboard: 17.95 ft / 5.47 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 177.9 %
- Above water (accommodation/working, high = better): 190.2 %
Waterplane Area: 14,159 Square feet or 1,315 Square metres
Displacement factor (Displacement / loading): 84 %
Structure weight / hull surface area: 42 lbs/sq ft or 203 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.07
- Overall: 0.54
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

Hmm, Bulgaria's definitely interested in the HDW proposal... (but did you note the hull strength is .50 for a ship over 3,000 tons?)

Here's the design I cooked up last night:

Quoted

[SIZE=3]Bulgarian Minelayer laid down 1939[/SIZE]

Displacement:
2,570 t light; 2,681 t standard; 2,970 t normal; 3,201 t full load

Dimensions: Length overall / water x beam x draught
413.01 ft / 405.00 ft x 40.00 ft x 14.75 ft (normal load)
125.88 m / 123.44 m x 12.19 m x 4.50 m

Armament:
6 - 4.13" / 105 mm guns (3x2 guns), 35.32lbs / 16.02kg shells, 1939 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward
16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.88kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 243 lbs / 110 kg
Shells per gun, main battery: 350

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 66,590 shp / 49,676 Kw = 35.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 520 tons

Complement:
200 - 261

Cost:
£1.970 million / $7.881 million

Distribution of weights at normal displacement:
Armament: 30 tons, 1.0 %
Machinery: 1,594 tons, 53.7 %
Hull, fittings & equipment: 776 tons, 26.1 %
Fuel, ammunition & stores: 400 tons, 13.5 %
Miscellaneous weights: 170 tons, 5.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
696 lbs / 316 Kg = 19.7 x 4.1 " / 105 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 1.9 ft / 0.6 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.24
Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.435
Length to Beam Ratio: 10.13 : 1
'Natural speed' for length: 20.12 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 69
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: 22.00 ft / 6.71 m
- Forecastle (20 %): 21.00 ft / 6.40 m
- Mid (50 %): 20.00 ft / 6.10 m (13.00 ft / 3.96 m aft of break)
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 16.93 ft / 5.16 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 188.3 %
- Above water (accommodation/working, high = better): 160.1 %
Waterplane Area: 10,211 Square feet or 949 Square metres
Displacement factor (Displacement / loading): 74 %
Structure weight / hull surface area: 39 lbs/sq ft or 189 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.72
- Overall: 0.57
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

Breakdown of Miscellaneous Weights:
- 160 tons for 160 FMO-37/950 naval mines

Just throwing something out. BTW Hrolf, IIRC 0.50 is only valid for ships with a displacement less than 3000 tons. Your vessel is well over 3000 tons. Edit: Never mind, Brock already mentioned it. BTW Brock, shouldn't the l:b ratio of that design be 10:1 or less?


Enter ship name, Enter country Enter ship type laid down 1938

Displacement:
2,845 t light; 2,957 t standard; 3,291 t normal; 3,559 t full load

Dimensions: Length overall / water x beam x draught
400.00 ft / 400.00 ft x 40.00 ft x 16.00 ft (normal load)
121.92 m / 121.92 m x 12.19 m x 4.88 m

Armament:
6 - 4.13" / 105 mm guns (3x2 guns), 35.32lbs / 16.02kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.89kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 228 lbs / 103 kg
Shells per gun, main battery: 350

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm -

- Conning tower: 2.00" / 51 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 68,156 shp / 50,844 Kw = 34.50 kts
Range 5,400nm at 15.00 kts
Bunker at max displacement = 602 tons

Complement:
216 - 282

Cost:
£2.046 million / $8.185 million

Distribution of weights at normal displacement:
Armament: 28 tons, 0.9%
Armour: 31 tons, 0.9%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 21 tons, 0.7%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 10 tons, 0.3%
Machinery: 1,711 tons, 52.0%
Hull, fittings & equipment: 824 tons, 25.0%
Fuel, ammunition & stores: 447 tons, 13.6%
Miscellaneous weights: 250 tons, 7.6%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
742 lbs / 337 Kg = 21.0 x 4.1 " / 105 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 1.6 ft / 0.5 m
Roll period: 13.2 seconds
Steadiness - As gun platform (Average = 50 %): 73 %
- Recoil effect (Restricted arc if above 1.00): 0.29
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.450
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 20.00 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 70
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: 25.00 ft / 7.62 m
- Forecastle (20%): 17.00 ft / 5.18 m
- Mid (50%): 17.00 ft / 5.18 m
- Quarterdeck (15%): 17.00 ft / 5.18 m
- Stern: 17.00 ft / 5.18 m
- Average freeboard: 17.64 ft / 5.38 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 183.5%
- Above water (accommodation/working, high = better): 153.0%
Waterplane Area: 10,206 Square feet or 948 Square metres
Displacement factor (Displacement / loading): 78%
Structure weight / hull surface area: 39 lbs/sq ft or 192 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.93
- Overall: 0.57
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

Quoted

Originally posted by Rooijen10
BTW Brock, shouldn't the l:b ratio of that design be 10:1 or less?

Eyup, it technically should - but it's only a half-foot of difference, and the 1:10 LB ratio isn't one of my ironclad demands, just a guideline. (That said, don't stray too far from the guidelines).

Here's a slightly longer, larger ship (still 1:10) with more miscellaneous weight.

Quoted

[SIZE=3]Bulgarian Minelayer laid down 1939[/SIZE]

Displacement:
2,710 t light; 2,824 t standard; 3,122 t normal; 3,360 t full load

Dimensions: Length overall / water x beam x draught
418.17 ft / 410.11 ft x 41.01 ft x 14.76 ft (normal load)
127.46 m / 125.00 m x 12.50 m x 4.50 m

Armament:
6 - 4.13" / 105 mm guns (3x2 guns), 35.32lbs / 16.02kg shells, 1939 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward
16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.88kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 243 lbs / 110 kg
Shells per gun, main battery: 350

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 68,601 shp / 51,176 Kw = 35.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 536 tons

Complement:
208 - 271

Cost:
£2.060 million / $8.240 million

Distribution of weights at normal displacement:
Armament: 30 tons, 1.0 %
Machinery: 1,669 tons, 53.5 %
Hull, fittings & equipment: 826 tons, 26.4 %
Fuel, ammunition & stores: 411 tons, 13.2 %
Miscellaneous weights: 185 tons, 5.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
765 lbs / 347 Kg = 21.7 x 4.1 " / 105 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.26
Metacentric height 2.0 ft / 0.6 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.23
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.440
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 20.25 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 67
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: 22.15 ft / 6.75 m
- Forecastle (20 %): 21.00 ft / 6.40 m
- Mid (60 %): 19.69 ft / 6.00 m (12.80 ft / 3.90 m aft of break)
- Quarterdeck (15 %): 12.80 ft / 3.90 m
- Stern: 12.80 ft / 3.90 m
- Average freeboard: 17.55 ft / 5.35 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 187.5 %
- Above water (accommodation/working, high = better): 170.0 %
Waterplane Area: 10,642 Square feet or 989 Square metres
Displacement factor (Displacement / loading): 75 %
Structure weight / hull surface area: 40 lbs/sq ft or 193 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.80
- Overall: 0.57
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

Breakdown of Miscellaneous Weights:
- 160 tons for 160 FMO-37/950 naval mines
- 25 tons for electronics fit (including hydrophones) and ASW

Quoted

Originally posted by Brockpaine
Hmm, Bulgaria's definitely interested in the HDW proposal... (but did you note the hull strength is .50 for a ship over 3,000 tons?)

Argh. Need to fix that, it was based on the latest large destroyer class I've built and just forgot that it was already right on the breakpoint for a .50 hull strength.

My try:


Enter ship name, Bulgarian Minelayer laid down 1938

Displacement:
2,863 t light; 2,994 t standard; 3,305 t normal; 3,554 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(489.60 ft / 475.72 ft) x 47.57 ft x (13.45 / 14.09 ft)
(149.23 m / 145.00 m) x 14.50 m x (4.10 / 4.29 m)

Armament:
6 - 4.13" / 105 mm 65.0 cal guns - 39.15lbs / 17.76kg shells, 350 per gun
Dual purpose guns in turret on barbette mounts, 1938 Model
3 x Twin mounts on centreline ends, majority forward
1 raised mount - superfiring
12 - 1.57" / 40.0 mm 60.0 cal guns - 2.12lbs / 0.96kg shells, 1,200 per gun
Anti-air guns in deck mounts, 1938 Model
6 x Twin mounts on sides, evenly spread
8 - 0.79" / 20.0 mm 80.0 cal guns - 0.29lbs / 0.13kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1938 Model
4 x Twin mounts on centreline, evenly spread
4 raised mounts
Weight of broadside 263 lbs / 119 kg
Mines
150 - 2,094.39 lbs / 950.00 kg mines - 140.249 t total
in Above water - Stern racks/rails

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

- Conning towers: Forward 1.97" / 50 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 64,651 shp / 48,230 Kw = 35.20 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 560 tons

Complement:
217 - 283

Cost:
£2.079 million / $8.316 million

Distribution of weights at normal displacement:
Armament: 269 tons, 8.1%
- Guns: 93 tons, 2.8%
- Weapons: 175 tons, 5.3%
Armour: 49 tons, 1.5%
- Armament: 39 tons, 1.2%
- Conning Tower: 9 tons, 0.3%
Machinery: 1,666 tons, 50.4%
Hull, fittings & equipment: 854 tons, 25.8%
Fuel, ammunition & stores: 442 tons, 13.4%
Miscellaneous weights: 25 tons, 0.8%
- Hull below water: 10 tons
- Above deck: 15 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
956 lbs / 434 Kg = 27.1 x 4.1 " / 105 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.37
Metacentric height 2.8 ft / 0.9 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.15
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has a flush deck,
a normal bow and a round stern
Block coefficient (normal/deep): 0.380 / 0.390
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 21.81 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 68
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%, 26.25 ft / 8.00 m, 19.69 ft / 6.00 m
- Forward deck: 20.00%, 19.69 ft / 6.00 m, 14.76 ft / 4.50 m
- Aft deck: 45.00%, 14.76 ft / 4.50 m, 14.76 ft / 4.50 m
- Quarter deck: 15.00%, 14.76 ft / 4.50 m, 14.76 ft / 4.50 m
- Average freeboard: 16.77 ft / 5.11 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 174.1%
- Above water (accommodation/working, high = better): 187.3%
Waterplane Area: 13,746 Square feet or 1,277 Square metres
Displacement factor (Displacement / loading): 84%
Structure weight / hull surface area: 40 lbs/sq ft or 198 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 0.91
- Overall: 0.53
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

OK, here's a corrected HDW entry. The hull got a little shorter and lost a little draught (no bad thing if there are shallower waters in the region), and I had to lose a knot of speed. But the armament and stores capability stayed the same, and I even worked in some armor on the rear superstructure.

Danube, Rumanian Minelayer laid down 1938

Displacement:
2,864 t light; 2,999 t standard; 3,311 t normal; 3,560 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(478.45 ft / 459.32 ft) x 45.77 ft x (13.12 / 13.79 ft)
(145.83 m / 140.00 m) x 13.95 m x (4.00 / 4.20 m)

Armament:
6 - 4.13" / 105 mm 65.0 cal guns - 39.16lbs / 17.76kg shells, 350 per gun
Dual purpose guns in deck and hoist mounts, 1938 Model
3 x Twin mounts on centreline ends, majority forward
2 raised mounts - superfiring
12 - 1.57" / 40.0 mm 60.0 cal guns - 2.14lbs / 0.97kg shells, 1,200 per gun
Anti-air guns in deck mounts, 1938 Model
6 x Twin mounts on sides, evenly spread
20 - 0.79" / 20.0 mm 89.0 cal guns - 0.28lbs / 0.13kg shells, 2,000 per gun
Machine guns in deck mounts, 1938 Model
3 x 2 row quad mounts on centreline, evenly spread
3 raised mounts
4 x Twin mounts on side ends, evenly spread
4 double raised mounts
Weight of broadside 266 lbs / 121 kg
Mines
200 - 2,094.39 lbs / 950.00 kg mines - 186.999 t total
in Above water - Stern racks/rails

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
3rd: 0.79" / 20 mm - -
4th: 0.39" / 10 mm - -

- Conning towers: Forward 2.76" / 70 mm, Aft 1.97" / 50 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 62,165 shp / 46,375 Kw = 34.50 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 561 tons

Complement:
217 - 283

Cost:
£2.049 million / $8.196 million

Distribution of weights at normal displacement:
Armament: 324 tons, 9.8 %
- Guns: 90 tons, 2.7 %
- Weapons: 234 tons, 7.1 %
Armour: 49 tons, 1.5 %
- Armament: 26 tons, 0.8 %
- Conning Towers: 23 tons, 0.7 %
Machinery: 1,621 tons, 49.0 %
Hull, fittings & equipment: 845 tons, 25.5 %
Fuel, ammunition & stores: 447 tons, 13.5 %
Miscellaneous weights: 25 tons, 0.8 %
- Hull below water: 10 tons
- Above deck: 15 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,006 lbs / 456 Kg = 28.5 x 4.1 " / 105 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.33
Metacentric height 2.6 ft / 0.8 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.20
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has a flush deck,
a normal bow and a round stern
Block coefficient (normal/deep): 0.420 / 0.430
Length to Beam Ratio: 10.04 : 1
'Natural speed' for length: 21.43 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 67
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 4.92 ft / 1.50 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 24.61 ft / 7.50 m, 16.40 ft / 5.00 m
- Forward deck: 30.00 %, 16.40 ft / 5.00 m, 16.40 ft / 5.00 m
- Aft deck: 35.00 %, 16.40 ft / 5.00 m, 16.40 ft / 5.00 m
- Quarter deck: 15.00 %, 16.40 ft / 5.00 m, 16.40 ft / 5.00 m
- Average freeboard: 17.06 ft / 5.20 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 169.9 %
- Above water (accommodation/working, high = better): 188.4 %
Waterplane Area: 13,106 Square feet or 1,218 Square metres
Displacement factor (Displacement / loading): 87 %
Structure weight / hull surface area: 40 lbs/sq ft or 196 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.02
- Overall: 0.53
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

As luck would have it this spec neatly fits what was the General San Martin in Argentine service in the early 1930s. (I still miss that ship..sob...)

Sooo, the Argentine Ship Designers of the Navy hunting for export cash offers a modified San Martin. You might get as many as 200-250 mines on her. After war experience with the San Martin the Argentine designers draw attention to the 130mm guns as the best standard to have. Better than the 105mm when the chips are down, at night when an enemy fast cruiser looms out of the darkness at you you need all the firepower you can get.

Project 324, Argentina/ Bulgaria Minelayer laid down 1938

Displacement:
2,922 t light; 3,068 t standard; 3,423 t normal; 3,708 t full load

Dimensions: Length overall / water x beam x draught
450.38 ft / 442.91 ft x 43.31 ft x 11.48 ft (normal load)
137.27 m / 135.00 m x 13.20 m x 3.50 m

Armament:
6 - 5.12" / 130 mm guns (3x2 guns), 67.03lbs / 30.41kg shells, 1938 Model
Breech loading guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
16 - 1.57" / 40.0 mm guns (8x2 guns), 1.95lbs / 0.89kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
24 - 0.79" / 20.0 mm guns (4x6 guns), 0.24lbs / 0.11kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 439 lbs / 199 kg
Shells per gun, main battery: 300

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

- Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 65,800 shp / 49,087 Kw = 34.01 kts
Range 5,500nm at 15.00 kts
Bunker at max displacement = 640 tons

Complement:
223 - 290

Cost:
£2.166 million / $8.664 million

Distribution of weights at normal displacement:
Armament: 55 tons, 1.6 %
Armour: 40 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 26 tons, 0.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 13 tons, 0.4 %
Machinery: 1,685 tons, 49.2 %
Hull, fittings & equipment: 992 tons, 29.0 %
Fuel, ammunition & stores: 502 tons, 14.7 %
Miscellaneous weights: 150 tons, 4.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,096 lbs / 497 Kg = 16.4 x 5.1 " / 130 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.41
Metacentric height 2.6 ft / 0.8 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.32
Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.544
Length to Beam Ratio: 10.23 : 1
'Natural speed' for length: 21.05 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.97 ft / 7.00 m
- Forecastle (20 %): 19.69 ft / 6.00 m
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (15 %): 18.04 ft / 5.50 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 18.88 ft / 5.76 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 177.2 %
- Above water (accommodation/working, high = better): 209.5 %
Waterplane Area: 13,311 Square feet or 1,237 Square metres
Displacement factor (Displacement / loading): 81 %
Structure weight / hull surface area: 41 lbs/sq ft or 200 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.50
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

Quoted

Originally posted by Hood
As luck would have it this spec neatly fits what was the General San Martin in Argentine service in the early 1930s. (I still miss that ship..sob...) ;(

A good ship she was, indeed. But you gave her away for a good story arc, so that offering was worth it.

If Bulgaria was willing to relax the gun restrictions, HDW could propose the following vessel:

Danube-15, Germany Fast Minelayer laid down 1937

Displacement:
2,841 t light; 2,990 t standard; 3,317 t normal; 3,578 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(475.86 ft / 459.32 ft) x 42.65 ft x (13.94 / 14.69 ft)
(145.04 m / 140.00 m) x 13.00 m x (4.25 / 4.48 m)

Armament:
6 - 5.91" / 150 mm 48.0 cal guns - 99.87lbs / 45.30kg shells, 150 per gun
Breech loading guns in deck and hoist mounts, 1937 Model
3 x Twin mounts on centreline ends, majority forward
1 raised mount - superfiring
4 - 3.46" / 88.0 mm 72.0 cal guns - 23.39lbs / 10.61kg shells, 360 per gun
Dual purpose guns in deck mounts, 1937 Model
2 x Twin mounts on centreline, aft evenly spread
2 raised mounts
8 - 1.46" / 37.0 mm 83.0 cal guns - 1.76lbs / 0.80kg shells, 1,200 per gun
Anti-air guns in deck mounts, 1937 Model
4 x Twin mounts on sides, evenly spread
16 - 0.79" / 20.0 mm 89.0 cal guns - 0.29lbs / 0.13kg shells, 2,000 per gun
Machine guns in deck mounts, 1937 Model
4 x 2 row quad mounts on sides, evenly spread
4 raised mounts
Weight of broadside 711 lbs / 323 kg
Mines
160 - 2,094.39 lbs / 950.00 kg mines - 149.599 t total
in Above water - Stern racks/rails

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.76" / 70 mm 1.57" / 40 mm 2.76" / 70 mm
2nd: 1.18" / 30 mm 0.79" / 20 mm -
3rd: 0.79" / 20 mm - -
4th: 0.39" / 10 mm - -

- Conning towers: Forward 2.76" / 70 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 58,063 shp / 43,315 Kw = 34.00 kts
Range 5,200nm at 15.00 kts
Bunker at max displacement = 588 tons

Complement:
218 - 284

Cost:
£2.104 million / $8.415 million

Distribution of weights at normal displacement:
Armament: 367 tons, 11.1 %
- Guns: 180 tons, 5.4 %
- Weapons: 187 tons, 5.6 %
Armour: 70 tons, 2.1 %
- Armament: 57 tons, 1.7 %
- Conning Tower: 13 tons, 0.4 %
Machinery: 1,506 tons, 45.4 %
Hull, fittings & equipment: 862 tons, 26.0 %
Fuel, ammunition & stores: 476 tons, 14.4 %
Miscellaneous weights: 35 tons, 1.1 %
- Hull below water: 15 tons
- Above deck: 20 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
908 lbs / 412 Kg = 8.8 x 5.9 " / 150 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 1.8 ft / 0.6 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.66
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has a flush deck,
a normal bow and a round stern
Block coefficient (normal/deep): 0.425 / 0.435
Length to Beam Ratio: 10.77 : 1
'Natural speed' for length: 21.43 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 68
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 22.97 ft / 7.00 m, 16.40 ft / 5.00 m
- Forward deck: 30.00 %, 16.40 ft / 5.00 m, 16.40 ft / 5.00 m
- Aft deck: 35.00 %, 16.40 ft / 5.00 m, 14.76 ft / 4.50 m
- Quarter deck: 15.00 %, 14.76 ft / 4.50 m, 14.76 ft / 4.50 m
- Average freeboard: 16.40 ft / 5.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 168.6 %
- Above water (accommodation/working, high = better): 170.6 %
Waterplane Area: 12,257 Square feet or 1,139 Square metres
Displacement factor (Displacement / loading): 82 %
Structure weight / hull surface area: 44 lbs/sq ft or 213 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.07
- Overall: 0.54
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

Hood - very nice ship, but I need to point out that the normal tonnage is now over 3,000 t, and therefore hull strength has to be... yeah, .75.

No British proposal?

Hrolf: Bulgaria will consider 150mm guns, but I feel a dual-purpose weapon is a bit mandatory on this ship because of the threat of aircraft on the Black Sea. Hence why 105mm and 130mm guns were spec'ed instead of 150mm. Though the 88s are a good addition.

Here is a revised Argentine entry with lower displacement and the 105mm DP guns. The 20mm is the Argentine sextuple mount which can take any Orkelion series 20mm gun.

Project 324A, Argentina/ Bulgaria Minelayer laid down 1938

Displacement:
2,596 t light; 2,704 t standard; 3,000 t normal; 3,237 t full load

Dimensions: Length overall / water x beam x draught
450.38 ft / 442.91 ft x 43.31 ft x 11.48 ft (normal load)
137.27 m / 135.00 m x 13.20 m x 3.50 m

Armament:
6 - 4.13" / 105 mm guns (3x2 guns), 39.16lbs / 17.76kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
12 - 1.57" / 40.0 mm guns (6x2 guns), 1.95lbs / 0.88kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
24 - 0.79" / 20.0 mm guns (4x6 guns), 0.24lbs / 0.11kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 264 lbs / 120 kg
Shells per gun, main battery: 300

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

- Conning tower: 1.97" / 50 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 58,000 shp / 43,268 Kw = 34.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 533 tons

Complement:
202 - 263

Cost:
£1.820 million / $7.282 million

Distribution of weights at normal displacement:
Armament: 30 tons, 1.0 %
Armour: 28 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 20 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 9 tons, 0.3 %
Machinery: 1,477 tons, 49.2 %
Hull, fittings & equipment: 910 tons, 30.3 %
Fuel, ammunition & stores: 404 tons, 13.5 %
Miscellaneous weights: 150 tons, 5.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,076 lbs / 488 Kg = 30.5 x 4.1 " / 105 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.45
Metacentric height 2.7 ft / 0.8 m
Roll period: 11.0 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.19
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.477
Length to Beam Ratio: 10.23 : 1
'Natural speed' for length: 21.05 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 42
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.97 ft / 7.00 m
- Forecastle (20 %): 19.69 ft / 6.00 m
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (15 %): 18.04 ft / 5.50 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 18.88 ft / 5.76 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 173.1 %
- Above water (accommodation/working, high = better): 217.4 %
Waterplane Area: 12,516 Square feet or 1,163 Square metres
Displacement factor (Displacement / loading): 83 %
Structure weight / hull surface area: 39 lbs/sq ft or 191 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.62
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Vickers has taken an unusual approach and is offering what amounts to a super-destroyer based on the current British types with mine rails on the quarterdeck (X mount is atop the deckhouse).


Vickers Bulgarian Minelayer, Great Britain Minelayer laid down 1938

Displacement:
2,428 t light; 2,544 t standard; 2,880 t normal; 3,148 t full load

Dimensions: Length overall / water x beam x draught
384.83 ft / 375.00 ft x 37.00 ft x 14.50 ft (normal load)
117.30 m / 114.30 m x 11.28 m x 4.42 m

Armament:
6 - 4.13" / 105 mm guns (3x2 guns), 39.16lbs / 17.76kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 2 raised mounts - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.89kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all aft, all raised mounts - superfiring
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 252 lbs / 114 kg
Shells per gun, main battery: 400

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

- Conning tower: 1.97" / 50 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 62,880 shp / 46,909 Kw = 34.00 kts
Range 5,000nm at 16.00 kts
Bunker at max displacement = 604 tons

Complement:
196 - 255

Cost:
£1.826 million / $7.303 million

Distribution of weights at normal displacement:
Armament: 29 tons, 1.0 %
Armour: 22 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 13 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 9 tons, 0.3 %
Machinery: 1,535 tons, 53.3 %
Hull, fittings & equipment: 763 tons, 26.5 %
Fuel, ammunition & stores: 451 tons, 15.7 %
Miscellaneous weights: 80 tons, 2.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
749 lbs / 340 Kg = 21.2 x 4.1 " / 105 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.40
Metacentric height 2.0 ft / 0.6 m
Roll period: 10.9 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.31
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.501
Length to Beam Ratio: 10.14 : 1
'Natural speed' for length: 19.36 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 48
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: 27.00 ft / 8.23 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (45 %): 24.00 ft / 7.32 m (12.50 ft / 3.81 m aft of break)
- Quarterdeck (15 %): 12.50 ft / 3.81 m
- Stern: 12.50 ft / 3.81 m
- Average freeboard: 17.92 ft / 5.46 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 184.1 %
- Above water (accommodation/working, high = better): 152.2 %
Waterplane Area: 9,253 Square feet or 860 Square metres
Displacement factor (Displacement / loading): 76 %
Structure weight / hull surface area: 38 lbs/sq ft or 186 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.46
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

Quoted

Originally posted by Brockpaine
Hrolf: Bulgaria will consider 150mm guns, but I feel a dual-purpose weapon is a bit mandatory on this ship because of the threat of aircraft on the Black Sea. Hence why 105mm and 130mm guns were spec'ed instead of 150mm. Though the 88s are a good addition.

The 15cm twin turrets used on this design have sufficient elevation for most AA work, and certainly time fuzes can be used with the 15cm rounds, the main issue is rate of fire at high elevations which would not be particularly good.

Main armament is modified 105mm semiautomatic DP system originally developed for Russian 100mm and 130mm calibers.

Proposal B-1940M, Bulgarian Minelayer laid down 1940

Displacement:
2,727 t light; 2,850 t standard; 3,290 t normal; 3,643 t full load

Dimensions: Length overall / water x beam x draught
487.96 ft / 475.72 ft x 47.57 ft x 10.83 ft (normal load)
148.73 m / 145.00 m x 14.50 m x 3.30 m

Armament:
9 - 4.13" / 105 mm guns (3x3 guns), 35.32lbs / 16.02kg shells, 1940 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 2 raised mounts - superfiring
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1940 Model
Anti-aircraft guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
4 - 0.55" / 14.0 mm guns in single mounts, 0.08lbs / 0.04kg shells, 1940 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 331 lbs / 150 kg
Shells per gun, main battery: 300

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.20" / 5 mm -
2nd: 0.98" / 25 mm 0.20" / 5 mm -

- Conning tower: 0.98" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 59,522 shp / 44,404 Kw = 34.00 kts
Range 7,200nm at 15.00 kts
Bunker at max displacement = 793 tons

Complement:
216 - 282

Cost:
£2.064 million / $8.256 million

Distribution of weights at normal displacement:
Armament: 41 tons, 1.3 %
Armour: 16 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 12 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 5 tons, 0.1 %
Machinery: 1,528 tons, 46.4 %
Hull, fittings & equipment: 962 tons, 29.2 %
Fuel, ammunition & stores: 563 tons, 17.1 %
Miscellaneous weights: 180 tons, 5.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,144 lbs / 519 Kg = 32.4 x 4.1 " / 105 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.29
Metacentric height 2.6 ft / 0.8 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.24
Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.470
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 21.81 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (26 %): 17.06 ft / 5.20 m
- Mid (50 %): 17.06 ft / 5.20 m
- Quarterdeck (15 %): 17.06 ft / 5.20 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 17.92 ft / 5.46 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 166.5 %
- Above water (accommodation/working, high = better): 220.9 %
Waterplane Area: 14,681 Square feet or 1,364 Square metres
Displacement factor (Displacement / loading): 89 %
Structure weight / hull surface area: 40 lbs/sq ft or 197 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 0.99
- Overall: 0.53
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

Twin 105mm semiautomatic DP mounts simmed as triples

Hydrophones- 5 tons
Electronics - 10 tons
Mines and mine delivery system - 165 tons

Here is the Mexican Entry:


She'll look alot like the bottomo ship abve.

Mexican design laid down 1939

Displacement:
2,722 t light; 2,872 t standard; 3,202 t normal; 3,467 t full load

Dimensions: Length overall / water x beam x draught
450.00 ft / 450.00 ft x 45.00 ft x 13.50 ft (normal load)
137.16 m / 137.16 m x 13.72 m x 4.11 m

Armament:
6 - 5.12" / 130 mm guns (3x2 guns), 67.03lbs / 30.41kg shells, 1939 Model
Breech loading guns in deck mounts
on centreline ends, majority forward, 2 raised mounts - superfiring
12 - 1.57" / 40.0 mm guns (6x2 guns), 1.95lbs / 0.89kg shells, 1939 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1939 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 426 lbs / 193 kg
Shells per gun, main battery: 350
10 - 24.0" / 609.6 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Ends: Unarmoured
Upper: 1.00" / 25 mm 90.00 ft / 27.43 m 9.00 ft / 2.74 m

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

- Conning tower: 1.00" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 57,514 shp / 42,906 Kw = 34.00 kts
Range 5,500nm at 15.00 kts
Bunker at max displacement = 595 tons

Complement:
212 - 276

Cost:
£1.995 million / $7.979 million

Distribution of weights at normal displacement:
Armament: 53 tons, 1.7 %
Armour: 66 tons, 2.1 %
- Belts: 44 tons, 1.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 17 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 5 tons, 0.1 %
Machinery: 1,449 tons, 45.3 %
Hull, fittings & equipment: 853 tons, 26.6 %
Fuel, ammunition & stores: 481 tons, 15.0 %
Miscellaneous weights: 300 tons, 9.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
953 lbs / 432 Kg = 14.2 x 5.1 " / 130 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 2.3 ft / 0.7 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.17
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.410
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 21.21 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 70
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: 25.00 ft / 7.62 m
- Forecastle (20 %): 21.00 ft / 6.40 m
- Mid (45 %): 21.00 ft / 6.40 m (11.00 ft / 3.35 m aft of break)
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 15.82 ft / 4.82 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 170.7 %
- Above water (accommodation/working, high = better): 92.9 %
Waterplane Area: 12,541 Square feet or 1,165 Square metres
Displacement factor (Displacement / loading): 82 %
Structure weight / hull surface area: 41 lbs/sq ft or 202 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.55
- Longitudinal: 1.00
- Overall: 0.58
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

My attempt

Balgarski Abdiel, Danziger Schiffbau Enter ship type laid down 1938

Displacement:
2 824 t light; 2 974 t standard; 3 284 t normal; 3 532 t full load

Dimensions: Length overall / water x beam x draught
412,65 ft / 410,11 ft x 41,01 ft x 15,75 ft (normal load)
125,78 m / 125,00 m x 12,50 m x 4,80 m

Armament:
6 - 5,12" / 130 mm guns (3x2 guns), 67,03lbs / 30,40kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 1,57" / 40,0 mm guns (4x2 guns), 1,95lbs / 0,88kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 0,79" / 20,0 mm guns (4x2 guns), 0,24lbs / 0,11kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 420 lbs / 190 kg
Shells per gun, main battery: 350

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2,36" / 60 mm 2,36" / 60 mm 2,36" / 60 mm
2nd: 0,79" / 20 mm - -
3rd: 0,79" / 20 mm - -

- Armour deck: 0,39" / 10 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 62 387 shp / 46 541 Kw = 34,00 kts
Range 5 000nm at 15,00 kts
Bunker at max displacement = 558 tons

Complement:
216 - 281

Cost:
£2,050 million / $8,199 million

Distribution of weights at normal displacement:
Armament: 52 tons, 1,6 %
Armour: 132 tons, 4,0 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 55 tons, 1,7 %
- Armour Deck: 77 tons, 2,3 %
- Conning Tower: 0 tons, 0,0 %
Machinery: 1 577 tons, 48,0 %
Hull, fittings & equipment: 883 tons, 26,9 %
Fuel, ammunition & stores: 460 tons, 14,0 %
Miscellaneous weights: 180 tons, 5,5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
823 lbs / 373 Kg = 12,3 x 5,1 " / 130 mm shells or 0,4 torpedoes
Stability (Unstable if below 1.00): 1,11
Metacentric height 1,6 ft / 0,5 m
Roll period: 13,7 seconds
Steadiness - As gun platform (Average = 50 %): 76 %
- Recoil effect (Restricted arc if above 1.00): 0,52
Seaboat quality (Average = 1.00): 1,06

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,434
Length to Beam Ratio: 10,00 : 1
'Natural speed' for length: 20,25 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 71
Bow angle (Positive = bow angles forward): 6,65 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21,82 ft / 6,65 m
- Forecastle (20 %): 18,04 ft / 5,50 m
- Mid (50 %): 18,04 ft / 5,50 m (16,40 ft / 5,00 m aft of break)
- Quarterdeck (15 %): 16,40 ft / 5,00 m
- Stern: 16,40 ft / 5,00 m
- Average freeboard: 17,53 ft / 5,34 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 174,8 %
- Above water (accommodation/working, high = better): 160,3 %
Waterplane Area: 10 593 Square feet or 984 Square metres
Displacement factor (Displacement / loading): 79 %
Structure weight / hull surface area: 42 lbs/sq ft or 204 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 1,75
- Overall: 0,56
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

Vickers would like to submit a modified bid. Basically llike a Cathederal Class scout cruiser but modified for minelaying.

Bulgarian Minelayer, Great Britain Minelayer laid down 1938

Displacement:
2,384 t light; 2,517 t standard; 2,891 t normal; 3,190 t full load

Dimensions: Length overall / water x beam x draught
409.10 ft / 400.00 ft x 36.50 ft x 15.00 ft (normal load)
124.69 m / 121.92 m x 11.13 m x 4.57 m

Armament:
8 - 4.13" / 105 mm guns (4x2 guns), 39.16lbs / 17.76kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 330 lbs / 150 kg
Shells per gun, main battery: 400

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

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 50,000 shp / 37,300 Kw = 34.06 kts
Range 6,000nm at 16.00 kts
Bunker at max displacement = 672 tons

Complement:
196 - 256

Cost:
£1.689 million / $6.754 million

Distribution of weights at normal displacement:
Armament: 37 tons, 1.3 %
Armour: 18 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 18 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,319 tons, 45.6 %
Hull, fittings & equipment: 909 tons, 31.4 %
Fuel, ammunition & stores: 507 tons, 17.5 %
Miscellaneous weights: 100 tons, 3.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,128 lbs / 512 Kg = 31.9 x 4.1 " / 105 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.35
Metacentric height 1.9 ft / 0.6 m
Roll period: 11.2 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.51
Seaboat quality (Average = 1.00): 1.45

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0.462
Length to Beam Ratio: 10.96 : 1
'Natural speed' for length: 22.77 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 35
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): 163.1 %
- Above water (accommodation/working, high = better): 193.3 %
Waterplane Area: 9,774 Square feet or 908 Square metres
Displacement factor (Displacement / loading): 92 %
Structure weight / hull surface area: 39 lbs/sq ft or 193 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 3.30
- Overall: 0.60
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily