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Cerasus, Atlantis Light Cruiser laid down 1928

The Cerasus class Cruiser is a result of the Ares class design process, giving up some armor for improved armament and speed.

Displacement:

7,755 t light; 8,056 t standard; 8,895 t normal; 9,566 t full load

Dimensions: Length overall / water x beam x draught

589.28 ft / 578.00 ft x 60.00 ft x 19.10 ft (normal load)

179.61 m / 176.17 m x 18.29 m x 5.82 m

Armament:

12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1928 Model

Breech loading guns in turrets (on barbettes)

on centreline ends, evenly spread, 2 raised mounts - superfiring

8 - 3.00" / 76.2 mm guns (4x2 guns), 13.50lbs / 6.12kg shells, 1928 Model

Anti-aircraft guns in deck mounts with hoists

on side, all amidships

8 - 1.57" / 39.9 mm guns (4x2 guns), 1.93lbs / 0.88kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, evenly spread, all raised mounts

18 - 0.79" / 20.1 mm guns (6x3 guns), 0.25lbs / 0.11kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, evenly spread, all raised mounts

Weight of broadside 1,424 lbs / 646 kg

Shells per gun, main battery: 150

12 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Belts: Width (max) Length (avg) Height (avg)

Main: 3.95" / 100 mm 362.00 ft / 110.34 m 8.20 ft / 2.50 m

Ends: Unarmoured

Main Belt covers 96 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 3.15" / 80 mm 2.35" / 60 mm 3.15" / 80 mm

2nd: 1.00" / 25 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 4 shafts, 69,705 shp / 52,000 Kw = 31.06 kts

Range 6,800nm at 15.00 kts

Bunker at max displacement = 1,510 tons

Complement:

457 - 595

Cost:

£2.767 million / $11.069 million

Distribution of weights at normal displacement:

Armament: 178 tons, 2.0 %

Armour: 1,487 tons, 16.7 %

- Belts: 492 tons, 5.5 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 312 tons, 3.5 %

- Armour Deck: 653 tons, 7.3 %

- Conning Tower: 29 tons, 0.3 %

Machinery: 2,170 tons, 24.4 %

Hull, fittings & equipment: 3,845 tons, 43.2 %

Fuel, ammunition & stores: 1,140 tons, 12.8 %

Miscellaneous weights: 75 tons, 0.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

12,556 lbs / 5,695 Kg = 116.3 x 6.0 " / 152 mm shells or 1.6 torpedoes

Stability (Unstable if below 1.00): 1.14

Metacentric height 3.0 ft / 0.9 m

Roll period: 14.6 seconds

Steadiness - As gun platform (Average = 50 %): 70 %

- Recoil effect (Restricted arc if above 1.00): 0.49

Seaboat quality (Average = 1.00): 1.32

Hull form characteristics:

Hull has raised forecastle

Block coefficient: 0.470

Length to Beam Ratio: 9.63 : 1

'Natural speed' for length: 24.04 kts

Power going to wave formation at top speed: 54 %

Trim (Max stability = 0, Max steadiness = 100): 53

Bow angle (Positive = bow angles forward): 20.00 degrees

Stern overhang: 2.00 ft / 0.61 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 25.50 ft / 7.77 m

- Forecastle (20 %): 24.50 ft / 7.47 m (24.00 ft / 7.32 m aft of break)

- Mid (50 %): 24.00 ft / 7.32 m

- Quarterdeck (15 %): 14.00 ft / 4.27 m

- Stern: 14.00 ft / 4.27 m

- Average freeboard: 20.93 ft / 6.38 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 96.0 %

- Above water (accommodation/working, high = better): 152.2 %

Waterplane Area: 22,497 Square feet or 2,090 Square metres

Displacement factor (Displacement / loading): 121 %

Structure weight / hull surface area: 104 lbs/sq ft or 507 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.95

- Longitudinal: 1.63

- Overall: 1.01

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

H-class , Atlantis Destroyer laid down 1928

The H class Destroyer leaders are designed to replace the older CLDD's as true destroyer leaders, they mount a new 5.1" gun.

H-class , Atlantis Destroyer laid down 1928

Displacement:

1,768 t light; 1,866 t standard; 2,074 t normal; 2,241 t full load

Dimensions: Length overall / water x beam x draught

386.42 ft / 375.00 ft x 36.00 ft x 12.25 ft (normal load)

117.78 m / 114.30 m x 10.97 m x 3.73 m

Armament:

6 - 5.10" / 130 mm guns (3x2 guns), 66.33lbs / 30.09kg shells, 1928 Model

Breech loading guns in deck mounts with hoists

on centreline ends, majority forward, 1 raised mount - superfiring

2 - 1.58" / 40.0 mm guns (1x2 guns), 1.95lbs / 0.89kg shells, 1928 Model

Anti-aircraft guns in deck mount

on side

8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1928 Model

Breech loading guns in deck mounts

on side, evenly spread

Weight of broadside 404 lbs / 183 kg

Shells per gun, main battery: 250

6 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.00" / 25 mm 0.79" / 20 mm -

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 2 shafts, 44,235 shp / 33,000 Kw = 33.22 kts

Range 4,000nm at 15.00 kts

Bunker at max displacement = 374 tons

Complement:

153 - 199

Cost:

£0.969 million / $3.877 million

Distribution of weights at normal displacement:

Armament: 50 tons, 2.4 %

Armour: 18 tons, 0.9 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 18 tons, 0.9 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 1,068 tons, 51.5 %

Hull, fittings & equipment: 606 tons, 29.2 %

Fuel, ammunition & stores: 306 tons, 14.8 %

Miscellaneous weights: 25 tons, 1.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

491 lbs / 223 Kg = 7.4 x 5.1 " / 130 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.31

Metacentric height 1.8 ft / 0.5 m

Roll period: 11.4 seconds

Steadiness - As gun platform (Average = 50 %): 60 %

- Recoil effect (Restricted arc if above 1.00): 0.54

Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:

Hull has rise forward of midbreak

Block coefficient: 0.439

Length to Beam Ratio: 10.42 : 1

'Natural speed' for length: 19.36 kts

Power going to wave formation at top speed: 66 %

Trim (Max stability = 0, Max steadiness = 100): 60

Bow angle (Positive = bow angles forward): 25.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 24.50 ft / 7.47 m

- Forecastle (20 %): 20.50 ft / 6.25 m

- Mid (45 %): 20.50 ft / 6.25 m (10.50 ft / 3.20 m aft of break)

- Quarterdeck (12 %): 10.50 ft / 3.20 m

- Stern: 10.50 ft / 3.20 m

- Average freeboard: 15.32 ft / 4.67 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 187.3 %

- Above water (accommodation/working, high = better): 104.5 %

Waterplane Area: 8,536 Square feet or 793 Square metres

Displacement factor (Displacement / loading): 65 %

Structure weight / hull surface area: 37 lbs/sq ft or 179 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.48

- Longitudinal: 1.56

- Overall: 0.54

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is adequate

Admiralty class DD, Atlantis Destroyer

laid down 1916, conversion to blimp tender in 1928

Uprising and Upsurge will be converted to tend scouting blimps. The conversion involves the removal of the aft superstructure and the fitting of a simple handling deck and a mooring mast aft. Winching equipment will assist in the docking process on such a small hull.

Displacement:

1,025 t light; 1,061 t standard; 1,244 t normal; 1,391 t full load

Dimensions: Length overall / water x beam x draught

310.00 ft / 310.00 ft x 30.00 ft x 10.50 ft (normal load)

94.49 m / 94.49 m x 9.14 m x 3.20 m

Armament:

2 - 4.50" / 114 mm guns (1x2 guns), 45.56lbs / 20.67kg shells, 1928 Model

Quick firing guns in a deck mount with hoist

on centreline forward

2 - 1.57" / 39.9 mm guns (1x2 guns), 1.93lbs / 0.88kg shells, 1928 Model

Anti-aircraft guns in deck mount

on centreline forward

4 - 0.79" / 20.1 mm guns (2x2 guns), 0.25lbs / 0.11kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, all forward

2 - 0.79" / 20.1 mm guns in single mounts, 0.25lbs / 0.11kg shells, 1916 Model

Anti-aircraft guns in deck mounts

on side, all aft

Weight of broadside 96 lbs / 44 kg

Shells per gun, main battery: 200

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 0.78" / 20 mm - -

Machinery:

Diesel Internal combustion motors,

Direct drive, 2 shafts, 9,220 shp / 6,878 Kw = 24.00 kts

Range 6,500nm at 12.00 kts

Bunker at max displacement = 331 tons

Complement:

104 - 136

Cost:

£0.154 million / $0.616 million

Distribution of weights at normal displacement:

Armament: 12 tons, 1.0 %

Armour: 3 tons, 0.3 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 3 tons, 0.3 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 344 tons, 27.6 %

Hull, fittings & equipment: 546 tons, 43.9 %

Fuel, ammunition & stores: 220 tons, 17.7 %

Miscellaneous weights: 120 tons, 9.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

1,462 lbs / 663 Kg = 32.1 x 4.5 " / 114 mm shells or 0.6 torpedoes

Stability (Unstable if below 1.00): 1.18

Metacentric height 1.1 ft / 0.3 m

Roll period: 11.9 seconds

Steadiness - As gun platform (Average = 50 %): 70 %

- Recoil effect (Restricted arc if above 1.00): 0.23

Seaboat quality (Average = 1.00): 1.64

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.446

Length to Beam Ratio: 10.33 : 1

'Natural speed' for length: 17.61 kts

Power going to wave formation at top speed: 54 %

Trim (Max stability = 0, Max steadiness = 100): 43

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: 20.00 ft / 6.10 m

- Forecastle (20 %): 18.00 ft / 5.49 m

- Mid (40 %): 10.00 ft / 3.05 m

- Quarterdeck (15 %): 10.00 ft / 3.05 m

- Stern: 10.00 ft / 3.05 m

- Average freeboard: 12.56 ft / 3.83 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 108.1 %

- Above water (accommodation/working, high = better): 121.6 %

Waterplane Area: 5,913 Square feet or 549 Square metres

Displacement factor (Displacement / loading): 137 %

Structure weight / hull surface area: 48 lbs/sq ft or 235 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.95

- Longitudinal: 2.62

- Overall: 1.05

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

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Lamia, Atlantian Airship Tender

converted Oil Tanker laid down 1925, converted to Airship Tender 1928

The Lamia and Tronagarru are converted Tankers identical to the Sea Lark class tankers in naval service.

The Sea Sprite and Seam Mermaid have been purchased from civilian yards following a failed building contract and will convert along similar lines to the Admiralty class destroyers, albeit on a larger scale to handle large rigids and scouting blimps.

Displacement:

10,155 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

Armament:

2 - 4.50" / 114 mm guns (1x2 guns), 45.56lbs / 20.67kg shells, 1928 Model

Dual purpose guns in deck mount

on centreline forward

4 - 1.57" / 39.9 mm guns (2x2 guns), 1.93lbs / 0.88kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, all amidships

6 - 0.79" / 20.1 mm guns (2x3 guns), 0.25lbs / 0.11kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, evenly spread

Weight of broadside 100 lbs / 46 kg

Shells per gun, main battery: 180

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.57" / 40 mm 1.57" / 40 mm -

2nd: 0.79" / 20 mm - -

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:

£1.729 million / $6.918 million

Distribution of weights at normal displacement:

Armament: 13 tons, 0.1 %

Armour: 10 tons, 0.1 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 10 tons, 0.1 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 1,161 tons, 9.3 %

Hull, fittings & equipment: 3,971 tons, 32.0 %

Fuel, ammunition & stores: 2,262 tons, 18.2 %

Miscellaneous weights: 5,000 tons, 40.3 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

14,289 lbs / 6,481 Kg = 313.6 x 4.5 " / 114 mm shells or 2.2 torpedoes

Stability (Unstable if below 1.00): 1.01

Metacentric height 2.7 ft / 0.8 m

Roll period: 16.7 seconds

Steadiness - As gun platform (Average = 50 %): 50 %

- Recoil effect (Restricted arc if above 1.00): 0.01

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 (0 %): 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): 75.6 %

- Above water (accommodation/working, high = better): 103.1 %

Waterplane Area: 20,490 Square feet or 1,904 Square metres

Displacement factor (Displacement / loading): 167 %

Structure weight / hull surface area: 126 lbs/sq ft or 617 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 1.42

- Longitudinal: 2.57

- Overall: 1.51

Hull space for machinery, storage, compartmentation is excellent

Room for accommodation and workspaces is adequate

Good seaboat, rides out heavy weather easily

The Cerasus class Cruiser is a result of the Ares class design process, giving up some armor for improved armament and speed.

Displacement:

7,755 t light; 8,056 t standard; 8,895 t normal; 9,566 t full load

Dimensions: Length overall / water x beam x draught

589.28 ft / 578.00 ft x 60.00 ft x 19.10 ft (normal load)

179.61 m / 176.17 m x 18.29 m x 5.82 m

Armament:

12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1928 Model

Breech loading guns in turrets (on barbettes)

on centreline ends, evenly spread, 2 raised mounts - superfiring

8 - 3.00" / 76.2 mm guns (4x2 guns), 13.50lbs / 6.12kg shells, 1928 Model

Anti-aircraft guns in deck mounts with hoists

on side, all amidships

8 - 1.57" / 39.9 mm guns (4x2 guns), 1.93lbs / 0.88kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, evenly spread, all raised mounts

18 - 0.79" / 20.1 mm guns (6x3 guns), 0.25lbs / 0.11kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, evenly spread, all raised mounts

Weight of broadside 1,424 lbs / 646 kg

Shells per gun, main battery: 150

12 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Belts: Width (max) Length (avg) Height (avg)

Main: 3.95" / 100 mm 362.00 ft / 110.34 m 8.20 ft / 2.50 m

Ends: Unarmoured

Main Belt covers 96 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 3.15" / 80 mm 2.35" / 60 mm 3.15" / 80 mm

2nd: 1.00" / 25 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 4 shafts, 69,705 shp / 52,000 Kw = 31.06 kts

Range 6,800nm at 15.00 kts

Bunker at max displacement = 1,510 tons

Complement:

457 - 595

Cost:

£2.767 million / $11.069 million

Distribution of weights at normal displacement:

Armament: 178 tons, 2.0 %

Armour: 1,487 tons, 16.7 %

- Belts: 492 tons, 5.5 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 312 tons, 3.5 %

- Armour Deck: 653 tons, 7.3 %

- Conning Tower: 29 tons, 0.3 %

Machinery: 2,170 tons, 24.4 %

Hull, fittings & equipment: 3,845 tons, 43.2 %

Fuel, ammunition & stores: 1,140 tons, 12.8 %

Miscellaneous weights: 75 tons, 0.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

12,556 lbs / 5,695 Kg = 116.3 x 6.0 " / 152 mm shells or 1.6 torpedoes

Stability (Unstable if below 1.00): 1.14

Metacentric height 3.0 ft / 0.9 m

Roll period: 14.6 seconds

Steadiness - As gun platform (Average = 50 %): 70 %

- Recoil effect (Restricted arc if above 1.00): 0.49

Seaboat quality (Average = 1.00): 1.32

Hull form characteristics:

Hull has raised forecastle

Block coefficient: 0.470

Length to Beam Ratio: 9.63 : 1

'Natural speed' for length: 24.04 kts

Power going to wave formation at top speed: 54 %

Trim (Max stability = 0, Max steadiness = 100): 53

Bow angle (Positive = bow angles forward): 20.00 degrees

Stern overhang: 2.00 ft / 0.61 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 25.50 ft / 7.77 m

- Forecastle (20 %): 24.50 ft / 7.47 m (24.00 ft / 7.32 m aft of break)

- Mid (50 %): 24.00 ft / 7.32 m

- Quarterdeck (15 %): 14.00 ft / 4.27 m

- Stern: 14.00 ft / 4.27 m

- Average freeboard: 20.93 ft / 6.38 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 96.0 %

- Above water (accommodation/working, high = better): 152.2 %

Waterplane Area: 22,497 Square feet or 2,090 Square metres

Displacement factor (Displacement / loading): 121 %

Structure weight / hull surface area: 104 lbs/sq ft or 507 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.95

- Longitudinal: 1.63

- Overall: 1.01

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

H-class , Atlantis Destroyer laid down 1928

The H class Destroyer leaders are designed to replace the older CLDD's as true destroyer leaders, they mount a new 5.1" gun.

H-class , Atlantis Destroyer laid down 1928

Displacement:

1,768 t light; 1,866 t standard; 2,074 t normal; 2,241 t full load

Dimensions: Length overall / water x beam x draught

386.42 ft / 375.00 ft x 36.00 ft x 12.25 ft (normal load)

117.78 m / 114.30 m x 10.97 m x 3.73 m

Armament:

6 - 5.10" / 130 mm guns (3x2 guns), 66.33lbs / 30.09kg shells, 1928 Model

Breech loading guns in deck mounts with hoists

on centreline ends, majority forward, 1 raised mount - superfiring

2 - 1.58" / 40.0 mm guns (1x2 guns), 1.95lbs / 0.89kg shells, 1928 Model

Anti-aircraft guns in deck mount

on side

8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1928 Model

Breech loading guns in deck mounts

on side, evenly spread

Weight of broadside 404 lbs / 183 kg

Shells per gun, main battery: 250

6 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.00" / 25 mm 0.79" / 20 mm -

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 2 shafts, 44,235 shp / 33,000 Kw = 33.22 kts

Range 4,000nm at 15.00 kts

Bunker at max displacement = 374 tons

Complement:

153 - 199

Cost:

£0.969 million / $3.877 million

Distribution of weights at normal displacement:

Armament: 50 tons, 2.4 %

Armour: 18 tons, 0.9 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 18 tons, 0.9 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 1,068 tons, 51.5 %

Hull, fittings & equipment: 606 tons, 29.2 %

Fuel, ammunition & stores: 306 tons, 14.8 %

Miscellaneous weights: 25 tons, 1.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

491 lbs / 223 Kg = 7.4 x 5.1 " / 130 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.31

Metacentric height 1.8 ft / 0.5 m

Roll period: 11.4 seconds

Steadiness - As gun platform (Average = 50 %): 60 %

- Recoil effect (Restricted arc if above 1.00): 0.54

Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:

Hull has rise forward of midbreak

Block coefficient: 0.439

Length to Beam Ratio: 10.42 : 1

'Natural speed' for length: 19.36 kts

Power going to wave formation at top speed: 66 %

Trim (Max stability = 0, Max steadiness = 100): 60

Bow angle (Positive = bow angles forward): 25.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 24.50 ft / 7.47 m

- Forecastle (20 %): 20.50 ft / 6.25 m

- Mid (45 %): 20.50 ft / 6.25 m (10.50 ft / 3.20 m aft of break)

- Quarterdeck (12 %): 10.50 ft / 3.20 m

- Stern: 10.50 ft / 3.20 m

- Average freeboard: 15.32 ft / 4.67 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 187.3 %

- Above water (accommodation/working, high = better): 104.5 %

Waterplane Area: 8,536 Square feet or 793 Square metres

Displacement factor (Displacement / loading): 65 %

Structure weight / hull surface area: 37 lbs/sq ft or 179 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.48

- Longitudinal: 1.56

- Overall: 0.54

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is adequate

Admiralty class DD, Atlantis Destroyer

laid down 1916, conversion to blimp tender in 1928

Uprising and Upsurge will be converted to tend scouting blimps. The conversion involves the removal of the aft superstructure and the fitting of a simple handling deck and a mooring mast aft. Winching equipment will assist in the docking process on such a small hull.

Displacement:

1,025 t light; 1,061 t standard; 1,244 t normal; 1,391 t full load

Dimensions: Length overall / water x beam x draught

310.00 ft / 310.00 ft x 30.00 ft x 10.50 ft (normal load)

94.49 m / 94.49 m x 9.14 m x 3.20 m

Armament:

2 - 4.50" / 114 mm guns (1x2 guns), 45.56lbs / 20.67kg shells, 1928 Model

Quick firing guns in a deck mount with hoist

on centreline forward

2 - 1.57" / 39.9 mm guns (1x2 guns), 1.93lbs / 0.88kg shells, 1928 Model

Anti-aircraft guns in deck mount

on centreline forward

4 - 0.79" / 20.1 mm guns (2x2 guns), 0.25lbs / 0.11kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, all forward

2 - 0.79" / 20.1 mm guns in single mounts, 0.25lbs / 0.11kg shells, 1916 Model

Anti-aircraft guns in deck mounts

on side, all aft

Weight of broadside 96 lbs / 44 kg

Shells per gun, main battery: 200

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 0.78" / 20 mm - -

Machinery:

Diesel Internal combustion motors,

Direct drive, 2 shafts, 9,220 shp / 6,878 Kw = 24.00 kts

Range 6,500nm at 12.00 kts

Bunker at max displacement = 331 tons

Complement:

104 - 136

Cost:

£0.154 million / $0.616 million

Distribution of weights at normal displacement:

Armament: 12 tons, 1.0 %

Armour: 3 tons, 0.3 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 3 tons, 0.3 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 344 tons, 27.6 %

Hull, fittings & equipment: 546 tons, 43.9 %

Fuel, ammunition & stores: 220 tons, 17.7 %

Miscellaneous weights: 120 tons, 9.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

1,462 lbs / 663 Kg = 32.1 x 4.5 " / 114 mm shells or 0.6 torpedoes

Stability (Unstable if below 1.00): 1.18

Metacentric height 1.1 ft / 0.3 m

Roll period: 11.9 seconds

Steadiness - As gun platform (Average = 50 %): 70 %

- Recoil effect (Restricted arc if above 1.00): 0.23

Seaboat quality (Average = 1.00): 1.64

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.446

Length to Beam Ratio: 10.33 : 1

'Natural speed' for length: 17.61 kts

Power going to wave formation at top speed: 54 %

Trim (Max stability = 0, Max steadiness = 100): 43

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: 20.00 ft / 6.10 m

- Forecastle (20 %): 18.00 ft / 5.49 m

- Mid (40 %): 10.00 ft / 3.05 m

- Quarterdeck (15 %): 10.00 ft / 3.05 m

- Stern: 10.00 ft / 3.05 m

- Average freeboard: 12.56 ft / 3.83 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 108.1 %

- Above water (accommodation/working, high = better): 121.6 %

Waterplane Area: 5,913 Square feet or 549 Square metres

Displacement factor (Displacement / loading): 137 %

Structure weight / hull surface area: 48 lbs/sq ft or 235 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.95

- Longitudinal: 2.62

- Overall: 1.05

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

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Lamia, Atlantian Airship Tender

converted Oil Tanker laid down 1925, converted to Airship Tender 1928

The Lamia and Tronagarru are converted Tankers identical to the Sea Lark class tankers in naval service.

The Sea Sprite and Seam Mermaid have been purchased from civilian yards following a failed building contract and will convert along similar lines to the Admiralty class destroyers, albeit on a larger scale to handle large rigids and scouting blimps.

Displacement:

10,155 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

Armament:

2 - 4.50" / 114 mm guns (1x2 guns), 45.56lbs / 20.67kg shells, 1928 Model

Dual purpose guns in deck mount

on centreline forward

4 - 1.57" / 39.9 mm guns (2x2 guns), 1.93lbs / 0.88kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, all amidships

6 - 0.79" / 20.1 mm guns (2x3 guns), 0.25lbs / 0.11kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, evenly spread

Weight of broadside 100 lbs / 46 kg

Shells per gun, main battery: 180

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.57" / 40 mm 1.57" / 40 mm -

2nd: 0.79" / 20 mm - -

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:

£1.729 million / $6.918 million

Distribution of weights at normal displacement:

Armament: 13 tons, 0.1 %

Armour: 10 tons, 0.1 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 10 tons, 0.1 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 1,161 tons, 9.3 %

Hull, fittings & equipment: 3,971 tons, 32.0 %

Fuel, ammunition & stores: 2,262 tons, 18.2 %

Miscellaneous weights: 5,000 tons, 40.3 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

14,289 lbs / 6,481 Kg = 313.6 x 4.5 " / 114 mm shells or 2.2 torpedoes

Stability (Unstable if below 1.00): 1.01

Metacentric height 2.7 ft / 0.8 m

Roll period: 16.7 seconds

Steadiness - As gun platform (Average = 50 %): 50 %

- Recoil effect (Restricted arc if above 1.00): 0.01

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 (0 %): 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): 75.6 %

- Above water (accommodation/working, high = better): 103.1 %

Waterplane Area: 20,490 Square feet or 1,904 Square metres

Displacement factor (Displacement / loading): 167 %

Structure weight / hull surface area: 126 lbs/sq ft or 617 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 1.42

- Longitudinal: 2.57

- Overall: 1.51

Hull space for machinery, storage, compartmentation is excellent

Room for accommodation and workspaces is adequate

Good seaboat, rides out heavy weather easily

The DD shows quad TT versus the implied triples. I'm also seeing more AA guns than listed.

The tenders are interesting. I kinda wonder if the proximity of the moored blimp to the blimp tender's funnels might be a problem. Maybe the exhaust should be trunked to some exhaust ports near the stern?

Good pics all round.

## Quoted

Originally posted by The Rock Doctor

The CL's a bit slow - is it intended more for escort work than independent action? The secondary battery's light for Wesworld, but quite reasonable compared to historical.

She is indeed more of an escort, smaller designs will follow for more independant action.

## Quoted

Originally posted by The Rock Doctor

The DD shows quad TT versus the implied triples. I'm also seeing more AA guns than listed.

Yeah I noticed the torpedo's AFTER I posted the pics, never caught the AA though, thanks for the catch!

## Quoted

Originally posted by The Rock Doctor

The tenders are interesting. I kinda wonder if the proximity of the moored blimp to the blimp tender's funnels might be a problem. Maybe the exhaust should be trunked to some exhaust ports near the stern?

The blimps will normally not be positioned that way, they are recovered from the stern, the blimps do however need enough room to swing around and not bump into anything which is what the drawing depicts.

Reguardless the funnels will cause some problems but the design overall will provide experience for improved designs.

The small hangar like structure is for the storage of the Blimps gondola and deflated canvass balloon.

I see you aren't paying the premium for high speed with your ships. The new leaders look a little under-powered (or are they pushers?) ; )

I see you've also given up on seakeeping for that cruiser. However she could take quite a battering.

I think on ballance, reasonable armour, 12-6" guns and 31knt speed on only 8000tons and you've invented the stubby Mogami.

Cheers,

With slight retooling of both the SS file and the drawing heres the design, any thoughts?

Cerasus, Atlantis Light Cruiser laid down 1928

Displacement:

7,755 t light; 8,056 t standard; 8,895 t normal; 9,566 t full load

Dimensions: Length overall / water x beam x draught

589.28 ft / 578.00 ft x 60.00 ft x 19.10 ft (normal load)

179.61 m / 176.17 m x 18.29 m x 5.82 m

Armament:

12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1928 Model

Breech loading guns in turrets (on barbettes)

on centreline ends, evenly spread, 2 raised mounts - superfiring

8 - 3.00" / 76.2 mm guns (4x2 guns), 13.50lbs / 6.12kg shells, 1928 Model

Anti-aircraft guns in deck mounts with hoists

on side, all amidships

8 - 1.57" / 39.9 mm guns (4x2 guns), 1.93lbs / 0.88kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, evenly spread, all raised mounts

18 - 0.79" / 20.1 mm guns (6x3 guns), 0.25lbs / 0.11kg shells, 1928 Model

Anti-aircraft guns in deck mounts

on side, evenly spread, all raised mounts

Weight of broadside 1,424 lbs / 646 kg

Shells per gun, main battery: 150

12 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Belts: Width (max) Length (avg) Height (avg)

Main: 3.95" / 100 mm 362.00 ft / 110.34 m 8.20 ft / 2.50 m

Ends: Unarmoured

Main Belt covers 96 % of normal length

Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 3.95" / 100 mm 2.35" / 60 mm 3.15" / 80 mm

2nd: 1.00" / 25 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 2.35" / 60 mm

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 4 shafts, 72,386 shp / 54,000 Kw = 31.36 kts

Range 6,800nm at 15.00 kts

Bunker at max displacement = 1,510 tons

Complement:

457 - 595

Cost:

£2.812 million / $11.248 million

Distribution of weights at normal displacement:

Armament: 178 tons, 2.0 %

Armour: 1,490 tons, 16.7 %

- Belts: 492 tons, 5.5 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 323 tons, 3.6 %

- Armour Deck: 653 tons, 7.3 %

- Conning Tower: 22 tons, 0.2 %

Machinery: 2,254 tons, 25.3 %

Hull, fittings & equipment: 3,759 tons, 42.3 %

Fuel, ammunition & stores: 1,140 tons, 12.8 %

Miscellaneous weights: 75 tons, 0.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

11,791 lbs / 5,348 Kg = 109.2 x 6.0 " / 152 mm shells or 1.6 torpedoes

Stability (Unstable if below 1.00): 1.12

Metacentric height 2.9 ft / 0.9 m

Roll period: 14.8 seconds

Steadiness - As gun platform (Average = 50 %): 70 %

- Recoil effect (Restricted arc if above 1.00): 0.48

Seaboat quality (Average = 1.00): 1.23

Hull form characteristics:

Hull has raised forecastle

Block coefficient: 0.470

Length to Beam Ratio: 9.63 : 1

'Natural speed' for length: 24.04 kts

Power going to wave formation at top speed: 55 %

Trim (Max stability = 0, Max steadiness = 100): 57

Bow angle (Positive = bow angles forward): 20.00 degrees

Stern overhang: 2.00 ft / 0.61 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 25.50 ft / 7.77 m

- Forecastle (20 %): 24.50 ft / 7.47 m (24.00 ft / 7.32 m aft of break)

- Mid (40 %): 24.00 ft / 7.32 m

- Quarterdeck (15 %): 14.00 ft / 4.27 m

- Stern: 14.00 ft / 4.27 m

- Average freeboard: 20.43 ft / 6.23 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 99.0 %

- Above water (accommodation/working, high = better): 146.7 %

Waterplane Area: 22,497 Square feet or 2,090 Square metres

Displacement factor (Displacement / loading): 119 %

Structure weight / hull surface area: 103 lbs/sq ft or 503 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.95

- Longitudinal: 1.50

- 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

O_O

Stem: 25.50 ft

Forecastle (at 20 %): 24.50 ft

Forecastle (after break): 24.00 ft

Mid (at 40 %): 24.00 ft

Quarterdeck (at 15 %): 14.00 ft

Stern: 14.00 ft

At 20% you have a 0.50 feet break.

Between mid (40%) and quarterdeck (85%) it gradually goes from 24 to 14 feet. There is no break at either point.

So shouldn't the 10 foot break be at the mid point?

Was something erased?

## Quoted

Yes. I should read;

Stem: 25.50 ft

Forecastle (at 20 %): 24.50 ft

Mid (at 40 %): 24.00 ft

Mid (after break): 14.00ft

Quarterdeck (at 15 %): 14.00 ft

Stern: 14.00 ft

I assume this is a discription of what the original design should read as.

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