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1

Tuesday, August 13th 2019, 9:21pm

naval projects for Atlantis, 1948

In 1948 Atlantis decided to convert its little used Airship tenders into missile test ships, renaming them for prominent stars in constellations.

Polaris (ex-Lamia) Regulus (ex-Tronagarru), Atlantean Missile test ship laid down 1925

Displacement:
10,166 t light; 10,414 t standard; 12,417 t normal; 14,019 t full load

Dimensions: Length overall / water x beam x draught
446.88 ft / 435.00 ft x 65.62 ft x 26.25 ft (normal load)
136.21 m / 132.59 m x 20.00 m x 8.00 m

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 20,107 ihp / 15,000 Kw = 20.54 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 3,606 tons

Complement:
587 - 764

Cost:
£1.696 million / $6.785 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 1,161 tons, 9.3 %
Hull, fittings & equipment: 4,005 tons, 32.3 %
Fuel, ammunition & stores: 2,251 tons, 18.1 %
Miscellaneous weights: 5,000 tons, 40.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,432 lbs / 6,546 Kg = 133.6 x 6 " / 152 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 2.7 ft / 0.8 m
Roll period: 16.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.46

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.580
Length to Beam Ratio: 6.63 : 1
'Natural speed' for length: 20.86 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 34
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 8.00 ft / 2.44 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.00 ft / 6.71 m
- Forecastle (20 %): 15.50 ft / 4.72 m
- Mid (50 %): 15.50 ft / 4.72 m
- Quarterdeck (15 %): 15.50 ft / 4.72 m
- Stern: 15.50 ft / 4.72 m
- Average freeboard: 16.02 ft / 4.88 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 74.8 %
- Above water (accommodation/working, high = better): 103.1 %
Waterplane Area: 20,490 Square feet or 1,904 Square metres
Displacement factor (Displacement / loading): 170 %
Structure weight / hull surface area: 127 lbs/sq ft or 622 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.44
- Longitudinal: 2.59
- Overall: 1.52
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily

Notes: The Polaris (ex-Lamia) and Regulus (ex-Tronagarru) were taken in had for convertion in 1948 to missile test ships. This involved removal of all airship tending equipment and the airship mast. The aviation fuel tank area was also modified to carry the various propellants needed to fuel the test missiles. A hagar was built aft to house the test stands, missile handling equipment and assembled missiles, the old funnel being trunked into two separate funnels at the sides of the hangar. Forward of the hangar was the missile assembly area and workshops.

Below the hangar and workshop the old airship spare parts storage was converted to store disassembled missiles. Additional space for crew, workshops, scientific labs, and generator rooms took up the remaining spaces in the new midships structure. A large mast was built on top of the midships structure forward of the hangar to mount tracking radar and the missile control platform sat at its base. A secondary control site sat on top of the after end of the hangar. Three heavy lift cranes were added aft to handle/errect the various test stands onto a 68'x68' 2" steel platform. Total cost for refit 2,546 tons.

Misc weight breakdown:
Missiles (varied) 10xAAM-5 missiles - 200 tons, 4xRapier cruise missiles 24 tons, 12xHera missiles - 12 tons, 10xDragon missiles 41 tons, 12xPhoenix missiles - 15 tons. Total capacity for 300 tons of missiles.
68'x68' 2" steel platform - 200 tons
Missile workshop - 1,000 tons
Launch stands for various missiles - 400 tons
Guidance and tracking radars - 50 tons
Navagational radar and other electronics - 20 tons
Three 50 ton cranes and Missile handling equipment - 350 tons
Science labs, crew amenities/berthing - 380 tons
Solid and Liquid fuel for missiles 900 tons
Missile control platform 200 tons
Total weight: 5,000 tons

2

Wednesday, August 14th 2019, 9:52am

An ambitious rebuild but one that certainly makes good use out of an older obsolete ship class.
The only thing that I would comment on, and that is not surprising given the scale of the misc weight, is that the stability is borderline at 1.01. But I assume you intend using this in sheltered coastal waters so it would not be a massive handicap.

3

Wednesday, August 14th 2019, 10:46am

You would be correct, these are test ships only and would be used in sheltered coastal waters in either northern Venezuela or Mauritania, most likely the former.

4

Sunday, September 8th 2019, 11:41am

A potential replacement for older light cruisers. This design is basically a modern improved Acestus class CL with slightly larger hull, 8" auto's in three twin turrets and greater speed. This design also see's the return of the recessed stern hangar to store 2 helicopters.

Eros, Atlantean Light cruiser laid down 1948

Displacement:
9,730 t light; 10,149 t standard; 10,995 t normal; 11,671 t full load

Dimensions: Length overall / water x beam x draught
634.32 ft / 615.00 ft x 64.00 ft x 20.20 ft (normal load)
193.34 m / 187.45 m x 19.51 m x 6.16 m

Armament:
6 - 8.00" / 203 mm guns (3x2 guns), 256.00lbs / 116.12kg shells, 1948 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 5.10" / 130 mm guns (4x2 guns), 66.33lbs / 30.09kg shells, 1948 Model
Automatic rapid fire guns in deck mounts with hoists
on side, evenly spread
12 - 2.95" / 74.9 mm guns (6x2 guns), 12.84lbs / 5.82kg shells, 1948 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
16 - 0.79" / 20.0 mm guns (4x4 guns), 0.24lbs / 0.11kg shells, 1948 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1948 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 2,225 lbs / 1,009 kg
Shells per gun, main battery: 150
6 - 25.6" / 650.24 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 354.33 ft / 108.00 m 9.02 ft / 2.75 m
Ends: Unarmoured
Main Belt covers 89 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.94" / 100 mm 2.95" / 75 mm 3.15" / 80 mm
2nd: 1.57" / 40 mm 0.79" / 20 mm 0.79" / 20 mm
3rd: 0.79" / 20 mm 0.79" / 20 mm -

- Armour deck: 1.57" / 40 mm, Conning tower: 1.57" / 40 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 86,096 shp / 64,227 Kw = 33.00 kts
Range 12,000nm at 12.00 kts
Bunker at max displacement = 1,522 tons

Complement:
536 - 697

Cost:
£6.800 million / $27.199 million

Distribution of weights at normal displacement:
Armament: 330 tons, 3.0 %
Armour: 1,674 tons, 15.2 %
- Belts: 535 tons, 4.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 339 tons, 3.1 %
- Armour Deck: 783 tons, 7.1 %
- Conning Tower: 17 tons, 0.2 %
Machinery: 2,104 tons, 19.1 %
Hull, fittings & equipment: 5,272 tons, 48.0 %
Fuel, ammunition & stores: 1,264 tons, 11.5 %
Miscellaneous weights: 350 tons, 3.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
16,030 lbs / 7,271 Kg = 62.6 x 8.0 " / 203 mm shells or 1.9 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 2.8 ft / 0.9 m
Roll period: 16.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.62
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.484
Length to Beam Ratio: 9.61 : 1
'Natural speed' for length: 28.44 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.00 ft / 9.14 m
- Forecastle (18 %): 22.00 ft / 6.71 m
- Mid (50 %): 22.00 ft / 6.71 m
- Quarterdeck (18 %): 22.00 ft / 6.71 m
- Stern: 22.00 ft / 6.71 m
- Average freeboard: 22.58 ft / 6.88 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 88.9 %
- Above water (accommodation/working, high = better): 177.3 %
Waterplane Area: 26,872 Square feet or 2,496 Square metres
Displacement factor (Displacement / loading): 124 %
Structure weight / hull surface area: 122 lbs/sq ft or 598 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 1.87
- Overall: 1.09
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

30 tons for torpedo reloads
10 tons for torpedo handling equipment
120 tons for electronics
20 tons for HVAC (heating ventalation and air conditioning)
20 tons for localized AA fire control
30 tons for Diesel generators (3x300kw diesel generators, 10 tons each)
20 tons for helicopter handling equipment.
70 tons for two Roth R-3 helicopters, 1 handling crane plus spare parts and fuel.
30 tons for future growth

5

Sunday, September 8th 2019, 5:03pm

I like it, quite powerful for the tonnage and not too expensive to break the bank.

6

Monday, September 9th 2019, 1:55am

The basic idea is that with the auto 8" twin turrets it can pack as much punch as cruisers typically 3,000-4,000 tons heavier but, as you say, not break the bank while providing a heavily armed and capable light cruiser suitable to be built in some numbers. Atlantis plans to build 12 of these types to replace the Pioneer class and eventually the Ares class. I also need to tweak the design as the belt doesn't completely cover the vitals.

7

Monday, September 9th 2019, 10:24pm

Fixed the armor error and added extra weight for the auto turrets inner workings. The design comes out slightly larger than the first design but still an acceptable level of growth.

Eros, Atlantean Light cruiser laid down 1948

Displacement:
10,079 t light; 10,505 t standard; 11,366 t normal; 12,055 t full load

Dimensions: Length overall / water x beam x draught
634.90 ft / 615.00 ft x 66.00 ft x 20.25 ft (normal load)
193.52 m / 187.45 m x 20.12 m x 6.17 m

Armament:
6 - 8.00" / 203 mm guns (3x2 guns), 256.00lbs / 116.12kg shells, 1948 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 5.10" / 130 mm guns (4x2 guns), 66.33lbs / 30.09kg shells, 1948 Model
Automatic rapid fire guns in deck mounts with hoists
on side, evenly spread
12 - 2.95" / 74.9 mm guns (6x2 guns), 12.84lbs / 5.82kg shells, 1948 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
16 - 0.79" / 20.0 mm guns (4x4 guns), 0.24lbs / 0.11kg shells, 1948 Model
Anti-aircraft guns in deck mounts
on side, all aft
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1948 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 2,225 lbs / 1,009 kg
Shells per gun, main battery: 150
6 - 25.6" / 650.24 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 347.77 ft / 106.00 m 9.02 ft / 2.75 m
Ends: Unarmoured
Main Belt covers 87 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.94" / 100 mm 2.95" / 75 mm 3.15" / 80 mm
2nd: 1.57" / 40 mm 0.79" / 20 mm 0.79" / 20 mm
3rd: 0.79" / 20 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 1.57" / 40 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 82,891 shp / 61,837 Kw = 32.50 kts
Range 12,000nm at 12.00 kts
Bunker at max displacement = 1,550 tons

Complement:
549 - 715

Cost:
£6.809 million / $27.236 million

Distribution of weights at normal displacement:
Armament: 330 tons, 2.9 %
Armour: 1,680 tons, 14.8 %
- Belts: 529 tons, 4.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 327 tons, 2.9 %
- Armour Deck: 807 tons, 7.1 %
- Conning Tower: 17 tons, 0.2 %
Machinery: 2,026 tons, 17.8 %
Hull, fittings & equipment: 5,868 tons, 51.6 %
Fuel, ammunition & stores: 1,287 tons, 11.3 %
Miscellaneous weights: 175 tons, 1.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
18,016 lbs / 8,172 Kg = 70.4 x 8.0 " / 203 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 3.0 ft / 0.9 m
Roll period: 16.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.55
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.484
Length to Beam Ratio: 9.32 : 1
'Natural speed' for length: 28.51 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.00 ft / 9.45 m
- Forecastle (18 %): 22.00 ft / 6.71 m
- Mid (50 %): 22.00 ft / 6.71 m
- Quarterdeck (18 %): 22.00 ft / 6.71 m
- Stern: 22.00 ft / 6.71 m
- Average freeboard: 22.65 ft / 6.90 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 82.3 %
- Above water (accommodation/working, high = better): 179.5 %
Waterplane Area: 27,711 Square feet or 2,574 Square metres
Displacement factor (Displacement / loading): 133 %
Structure weight / hull surface area: 135 lbs/sq ft or 660 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.13
- Longitudinal: 1.99
- Overall: 1.20
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

This design is basically a modern improved Acestus class CL with slightly larger hull, 8" auto's in three twin turrets and greater speed. This design also see's the return of the recessed stern hangar to store 2 helicopters.
225 tons for auto turret equipment (75 tons per turret)
30 tons for torpedo reloads
10 tons for torpedo handling equipment
120 tons for electronics
20 tons for HVAC (heating ventalation and air conditioning)
20 tons for localized AA fire control
30 tons for Diesel generators (3x300kw diesel generators, 10 tons each)
20 tons for helicopter handling equipment.
70 tons for two Roth R-3 helicopters, 1 handling crane plus spare parts and fuel.
130 tons for future growth

8

Monday, September 9th 2019, 10:30pm

I will admit, it is a nitpick - but at this point in time, is it worth continuing to mount the 12.7mm battery? Particularly with the strong 20mm battery? And shouldn't they be machineguns rather than just breech-loading guns?

9

Monday, September 9th 2019, 11:18pm

Its been a long standing design trait for Atlantean ships to carry 12.7mm guns for use against small craft, their placement is usually placed near senior staff positions in case they feel especially heroic/suicidal.

10

Tuesday, September 10th 2019, 5:36am

Pardon the Admiral, he is busy firing tracers at the offending destroyers.....

11

Tuesday, September 10th 2019, 5:54am